Add a generic fully device independent DMA buffer implementation that uses
the DMAegnine framework to perform the DMA transfers. This can be used by
converter drivers that whish to provide a DMA buffer for converters that
are connected to a DMA core that implements the DMAengine API.
Apart from allocating the buffer using iio_dmaengine_buffer_alloc() and
freeing it using iio_dmaengine_buffer_free() no additional converter driver
specific code is required when using this DMA buffer implementation.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
The traditional approach used in IIO to implement buffered capture requires
the generation of at least one interrupt per sample. In the interrupt
handler the driver reads the sample from the device and copies it to a
software buffer. This approach has a rather large per sample overhead
associated with it. And while it works fine for samplerates in the range of
up to 1000 samples per second it starts to consume a rather large share of
the available CPU processing time once we go beyond that, this is
especially true on an embedded system with limited processing power. The
regular interrupt also causes increased power consumption by not allowing
the hardware into deeper sleep states, which is something that becomes more
and more important on mobile battery powered devices.
And while the recently added watermark support mitigates some of the issues
by allowing the device to generate interrupts at a rate lower than the data
output rate, this still requires a storage buffer inside the device and
even if it exists it is only a few 100 samples deep at most.
DMA support on the other hand allows to capture multiple millions or even
more samples without any CPU interaction. This allows the CPU to either go
to sleep for longer periods or focus on other tasks which increases overall
system performance and power consumption. In addition to that some devices
might not even offer a way to read the data other than using DMA, which
makes DMA mandatory to use for them.
The tasks involved in implementing a DMA buffer can be divided into two
categories. The first category is memory buffer management (allocation,
mapping, etc.) and hooking this up the IIO buffer callbacks like read(),
enable(), disable(), etc. The second category of tasks is to setup the
DMA hardware and manage the DMA transfers. Tasks from the first category
will be very similar for all IIO drivers supporting DMA buffers, while the
tasks from the second category will be hardware specific.
This patch implements a generic infrastructure that take care of the former
tasks. It provides a set of functions that implement the standard IIO
buffer iio_buffer_access_funcs callbacks. These can either be used as is or
be overloaded and augmented with driver specific code where necessary.
For the DMA buffer support infrastructure that is introduced in this series
sample data is grouped by so called blocks. A block is the basic unit at
which data is exchanged between the application and the hardware. The
application is responsible for allocating the memory associated with the
block and then passes the block to the hardware. When the hardware has
captured the amount of samples equal to size of a block it will notify the
application, which can then read the data from the block and process it.
The block size can freely chosen (within the constraints of the hardware).
This allows to make a trade-off between latency and management overhead.
The larger the block size the lower the per sample overhead but the latency
between when the data was captured and when the application will be able to
access it increases, in a similar way smaller block sizes have a larger per
sample management overhead but a lower latency. The ideal block size thus
depends on system and application requirements.
For the time being the infrastructure only implements a simple double
buffered scheme which allocates two blocks each with half the size of the
configured buffer size. This provides basic support for capturing
continuous uninterrupted data over the existing file-IO ABI. Future
extensions to the DMA buffer infrastructure will give applications a more
fine grained control over how many blocks are allocated and the size of
each block. But this requires userspace ABI additions which are
intentionally not part of this patch and will be added separately.
Tasks of the second category need to be implemented by a device specific
driver. They can be hooked up into the generic infrastructure using two
simple callbacks, submit() and abort().
The submit() callback is used to schedule DMA transfers for blocks. Once a
DMA transfer has been completed it is expected that the buffer driver calls
iio_dma_buffer_block_done() to notify. The abort() callback is used for
stopping all pending and active DMA transfers when the buffer is disabled.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This patch adds a enable and disable callback that is called when the
buffer is enabled/disabled. This can be used by buffer implementations that
need to do some setup or teardown work. E.g. a DMA based buffer can use
this to start/stop the DMA transfer.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
For buffers which have a fixed wake-up watermark the watermark attribute
should be read-only. Add a new FIXED_WATERMARK flag to the
struct iio_buffer_access_funcs, which can be set by a buffer
implementation.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Some drivers use member screen_base of struct fb_info to store non-
__iomem pointers, creating the need for ugly __force typecasts to
avoid sparse warnings. This adds an alternate pointer without the
__iomem qualifyer for this use.
Signed-off-by: Lars Svensson <lars1.svensson@sonymobile.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Pull irq fixes from Thomas Gleixner:
"Three trivial commits:
- Fix a kerneldoc regression
- Export handle_bad_irq to unbreak a driver in next
- Add an accessor for the of_node field so refactoring in next does
not depend on merge ordering"
* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqdomain: Add an accessor for the of_node field
genirq: Fix handle_bad_irq kerneldoc comment
genirq: Export handle_bad_irq
Pull USB fixes from Greg KH:
"Here are some small USB and PHY fixes and quirk updates for 4.3-rc5.
Nothing major here, full details in the shortlog, and all of these
have been in linux-next for a while"
* tag 'usb-4.3-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
usb: Add device quirk for Logitech PTZ cameras
USB: chaoskey read offset bug
USB: Add reset-resume quirk for two Plantronics usb headphones.
usb: renesas_usbhs: Add support for R-Car H3
usb: renesas_usbhs: fix build warning if 64-bit architecture
usb: gadget: bdc: fix memory leak
phy: berlin-sata: Fix module autoload for OF platform driver
phy: rockchip-usb: power down phy when rockchip phy probe
phy: qcom-ufs: fix build error when the component is built as a module
Pull strscpy string copy function implementation from Chris Metcalf.
Chris sent this during the merge window, but I waffled back and forth on
the pull request, which is why it's going in only now.
The new "strscpy()" function is definitely easier to use and more secure
than either strncpy() or strlcpy(), both of which are horrible nasty
interfaces that have serious and irredeemable problems.
strncpy() has a useless return value, and doesn't NUL-terminate an
overlong result. To make matters worse, it pads a short result with
zeroes, which is a performance disaster if you have big buffers.
strlcpy(), by contrast, is a mis-designed "fix" for strlcpy(), lacking
the insane NUL padding, but having a differently broken return value
which returns the original length of the source string. Which means
that it will read characters past the count from the source buffer, and
you have to trust the source to be properly terminated. It also makes
error handling fragile, since the test for overflow is unnecessarily
subtle.
strscpy() avoids both these problems, guaranteeing the NUL termination
(but not excessive padding) if the destination size wasn't zero, and
making the overflow condition very obvious by returning -E2BIG. It also
doesn't read past the size of the source, and can thus be used for
untrusted source data too.
So why did I waffle about this for so long?
Every time we introduce a new-and-improved interface, people start doing
these interminable series of trivial conversion patches.
And every time that happens, somebody does some silly mistake, and the
conversion patch to the improved interface actually makes things worse.
Because the patch is mindnumbing and trivial, nobody has the attention
span to look at it carefully, and it's usually done over large swatches
of source code which means that not every conversion gets tested.
So I'm pulling the strscpy() support because it *is* a better interface.
But I will refuse to pull mindless conversion patches. Use this in
places where it makes sense, but don't do trivial patches to fix things
that aren't actually known to be broken.
* 'strscpy' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
tile: use global strscpy() rather than private copy
string: provide strscpy()
Make asm/word-at-a-time.h available on all architectures
Pull block fixes from Jens Axboe:
"Another week, another round of fixes.
These have been brewing for a bit and in various iterations, but I
feel pretty comfortable about the quality of them. They fix real
issues. The pull request is mostly blk-mq related, and the only one
not fixing a real bug, is the tag iterator abstraction from Christoph.
But it's pretty trivial, and we'll need it for another fix soon.
Apart from the blk-mq fixes, there's an NVMe affinity fix from Keith,
and a single fix for xen-blkback from Roger fixing failure to free
requests on disconnect"
* 'for-linus' of git://git.kernel.dk/linux-block:
blk-mq: factor out a helper to iterate all tags for a request_queue
blk-mq: fix racy updates of rq->errors
blk-mq: fix deadlock when reading cpu_list
blk-mq: avoid inserting requests before establishing new mapping
blk-mq: fix q->mq_usage_counter access race
blk-mq: Fix use after of free q->mq_map
blk-mq: fix sysfs registration/unregistration race
blk-mq: avoid setting hctx->tags->cpumask before allocation
NVMe: Set affinity after allocating request queues
xen/blkback: free requests on disconnection
Pull IOVA fixes from David Woodhouse:
"The main fix here is the first one, fixing the over-allocation of
size-aligned requests. The other patches simply make the existing
IOVA code available to users other than the Intel VT-d driver, with no
functional change.
I concede the latter really *should* have been submitted during the
merge window, but since it's basically risk-free and people are
waiting to build on top of it and it's my fault I didn't get it in, I
(and they) would be grateful if you'd take it"
* git://git.infradead.org/intel-iommu:
iommu: Make the iova library a module
iommu: iova: Export symbols
iommu: iova: Move iova cache management to the iova library
iommu/iova: Avoid over-allocating when size-aligned
Merge misc fixes from Andrew Morton:
"12 fixes"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
dmapool: fix overflow condition in pool_find_page()
thermal: avoid division by zero in power allocator
memcg: remove pcp_counter_lock
kprobes: use _do_fork() in samples to make them work again
drivers/input/joystick/Kconfig: zhenhua.c needs BITREVERSE
memcg: make mem_cgroup_read_stat() unsigned
memcg: fix dirty page migration
dax: fix NULL pointer in __dax_pmd_fault()
mm: hugetlbfs: skip shared VMAs when unmapping private pages to satisfy a fault
mm/slab: fix unexpected index mapping result of kmalloc_size(INDEX_NODE+1)
userfaultfd: remove kernel header include from uapi header
arch/x86/include/asm/efi.h: fix build failure
Pull power management and ACPI fixes from Rafael Wysocki:
"These are fixes mostly, for a few changes made in this cycle (the
intel_idle driver, the OPP library, the ACPI EC driver, turbostat) and
for some issues that have just been discovered (ACPI PCI IRQ
management, PCI power management documentation, turbostat), with a
couple of cleanups on top of them.
Specifics:
- intel_idle driver fixup for the recently added Skylake chips
support (Len Brown).
- Operating Performance Points (OPP) library fix related to the
recently added support for new DT bindings and a fix for a typo in
a comment (Viresh Kumar, Stephen Boyd).
- ACPI EC driver fix for a recently introduced memory leak in an
error code path (Lv Zheng).
- ACPI PCI IRQ management fix for the issue where an ISA IRQ is
shared with a PCI device which requires it to be configured in a
different way and may cause an interrupt storm to happen as a
result with an extra ACPI SCI IRQ handling simplification on top of
it (Jiang Liu).
- Update of the PCI power management documentation that became
outdated and started to actively confuse the readers to make it
actually reflect the code (Rafael J Wysocki).
- turbostat fixes including an IVB Xeon regression fix (related to
the --debug command line option), Skylake adjustment for the TSC
running at a frequency that doesn't match the base one exactly, and
a Knights Landing quirk to account for the fact that it only
updates APERF and MPERF every 1024 clock cycles plus bumping up the
turbostat version number (Len Brown, Hubert Chrzaniuk)"
* tag 'pm+acpi-4.3-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
tools/power turbosat: update version number
tools/power turbostat: SKL: Adjust for TSC difference from base frequency
tools/power turbostat: KNL workaround for %Busy and Avg_MHz
tools/power turbostat: IVB Xeon: fix --debug regression
ACPI / PCI: Remove duplicated penalty on SCI IRQ
ACPI, PCI, irq: Do not share PCI IRQ with ISA IRQ
ACPI / EC: Fix a memory leak issue in acpi_ec_query()
PM / OPP: Fix typo modifcation -> modification
PCI / PM: Update runtime PM documentation for PCI devices
PM / OPP: of_property_count_u32_elems() can return errors
intel_idle: Skylake Client Support - updated
Pull networking fixes from David Miller:
1) Fix regression in SKB partial checksum handling, from Pravin B
Shalar.
2) Fix VLAN inside of VXLAN handling in i40e driver, from Jesse
Brandeburg.
3) Cure softlockups during accept() in SCTP, from Karl Heiss.
4) MSG_PEEK should return multiple SKBs worth of data in AF_UNIX, from
Aaron Conole.
5) IPV6 erroneously ignores output interface specifier in lookup key for
route lookups, fix from David Ahern.
6) In Marvell DSA driver, forward unknown frames to CPU port, from
Andrew Lunn.
7) Mission flow flag initializations in some code paths, from David
Ahern.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
net: Initialize flow flags in input path
net: dsa: fix preparation of a port STP update
testptp: Silence compiler warnings on ppc64
net/mlx4: Handle return codes in mlx4_qp_attach_common
dsa: mv88e6xxx: Enable forwarding for unknown to the CPU port
skbuff: Fix skb checksum partial check.
net: ipv6: Add RT6_LOOKUP_F_IFACE flag if oif is set
net sysfs: Print link speed as signed integer
bna: fix error handling
af_unix: return data from multiple SKBs on recv() with MSG_PEEK flag
af_unix: Convert the unix_sk macro to an inline function for type safety
net: sctp: Don't use 64 kilobyte lookup table for four elements
l2tp: protect tunnel->del_work by ref_count
net/ibm/emac: bump version numbers for correct work with ethtool
sctp: Prevent soft lockup when sctp_accept() is called during a timeout event
sctp: Whitespace fix
i40e/i40evf: check for stopped admin queue
i40e: fix VLAN inside VXLAN
r8169: fix handling rtl_readphy result
net: hisilicon: fix handling platform_get_irq result
Commit 733a572e66 ("memcg: make mem_cgroup_read_{stat|event}() iterate
possible cpus instead of online") removed the last use of the per memcg
pcp_counter_lock but forgot to remove the variable.
Kill the vestigial variable.
Signed-off-by: Greg Thelen <gthelen@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The problem starts with a file backed dirty page which is charged to a
memcg. Then page migration is used to move oldpage to newpage.
Migration:
- copies the oldpage's data to newpage
- clears oldpage.PG_dirty
- sets newpage.PG_dirty
- uncharges oldpage from memcg
- charges newpage to memcg
Clearing oldpage.PG_dirty decrements the charged memcg's dirty page
count.
However, because newpage is not yet charged, setting newpage.PG_dirty
does not increment the memcg's dirty page count. After migration
completes newpage.PG_dirty is eventually cleared, often in
account_page_cleaned(). At this time newpage is charged to a memcg so
the memcg's dirty page count is decremented which causes underflow
because the count was not previously incremented by migration. This
underflow causes balance_dirty_pages() to see a very large unsigned
number of dirty memcg pages which leads to aggressive throttling of
buffered writes by processes in non root memcg.
This issue:
- can harm performance of non root memcg buffered writes.
- can report too small (even negative) values in
memory.stat[(total_)dirty] counters of all memcg, including the root.
To avoid polluting migrate.c with #ifdef CONFIG_MEMCG checks, introduce
page_memcg() and set_page_memcg() helpers.
Test:
0) setup and enter limited memcg
mkdir /sys/fs/cgroup/test
echo 1G > /sys/fs/cgroup/test/memory.limit_in_bytes
echo $$ > /sys/fs/cgroup/test/cgroup.procs
1) buffered writes baseline
dd if=/dev/zero of=/data/tmp/foo bs=1M count=1k
sync
grep ^dirty /sys/fs/cgroup/test/memory.stat
2) buffered writes with compaction antagonist to induce migration
yes 1 > /proc/sys/vm/compact_memory &
rm -rf /data/tmp/foo
dd if=/dev/zero of=/data/tmp/foo bs=1M count=1k
kill %
sync
grep ^dirty /sys/fs/cgroup/test/memory.stat
3) buffered writes without antagonist, should match baseline
rm -rf /data/tmp/foo
dd if=/dev/zero of=/data/tmp/foo bs=1M count=1k
sync
grep ^dirty /sys/fs/cgroup/test/memory.stat
(speed, dirty residue)
unpatched patched
1) 841 MB/s 0 dirty pages 886 MB/s 0 dirty pages
2) 611 MB/s -33427456 dirty pages 793 MB/s 0 dirty pages
3) 114 MB/s -33427456 dirty pages 891 MB/s 0 dirty pages
Notice that unpatched baseline performance (1) fell after
migration (3): 841 -> 114 MB/s. In the patched kernel, post
migration performance matches baseline.
Fixes: c4843a7593 ("memcg: add per cgroup dirty page accounting")
Signed-off-by: Greg Thelen <gthelen@google.com>
Reported-by: Dave Hansen <dave.hansen@intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: <stable@vger.kernel.org> [4.2+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull rdma fixes from Doug Ledford:
- Fixes for mlx5 related issues
- Fixes for ipoib multicast handling
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma:
IB/ipoib: increase the max mcast backlog queue
IB/ipoib: Make sendonly multicast joins create the mcast group
IB/ipoib: Expire sendonly multicast joins
IB/mlx5: Remove pa_lkey usages
IB/mlx5: Remove support for IB_DEVICE_LOCAL_DMA_LKEY
IB/iser: Add module parameter for always register memory
xprtrdma: Replace global lkey with lkey local to PD
And replace the blk_mq_tag_busy_iter with it - the driver use has been
replaced with a new helper a while ago, and internal to the block we
only need the new version.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
blk_mq_complete_request may be a no-op if the request has already
been completed by others means (e.g. a timeout or cancellation), but
currently drivers have to set rq->errors before calling
blk_mq_complete_request, which might leave us with the wrong error value.
Add an error parameter to blk_mq_complete_request so that we can
defer setting rq->errors until we known we won the race to complete the
request.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This patch fixes the following warning if 64-bit architecture environment:
./drivers/usb/renesas_usbhs/common.c:496:25: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
dparam->type = of_id ? (u32)of_id->data : 0;
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Jonathan writes:
First round of new driver, new functionality and cleanups for IIO in the 4.4 cycle
New device support
* APDS9960 ALS + proximity driver
* bmg160 SPI devices.
* HDC100x humidity sensors
* Holt HI-8435 threshold detector
* mma8453Q accelerometer added to the mma8452 driver
* mma86452FC and mma8653FC accelerometers added to the mma8452 driver
* mxc4005 accelerometer
* PulsedLight LIDAR
* SensorTech VZ89x volatile organic compound sensor
* UPISEMI uS5182d ALS and proximity sensors
New core functionality
* triggered events - use triggers to check for changes in threshold type
detectors on devices with out interrupt support. First user is the holt
comparator.
* chemical concentration and resistance channel types.
New driver functionality
* vf610
- buffer support.
- followup coccinelle warning fix.
Core rework
* buffers
- break out callback buffer to own module.
- move buffer implementations to a new subdirectory
* percolate the error code form iio_event_getfd out to userspace
rather than giving a missleading error later on.
Cleanups
* adddac drivers
- use BIT macro where appropriate.
* meter drivers
- use BIT macro where appropriate.
* ad7303
- add an OF match table to line up with the binding docs.
* adc128s052
- add an OF match table to line up with the binding docs.
* adf4350
- add an OF match table to line up with the binding docs
* as3935
- add an OF match table to line up with the binding docs.
* berlin2-adc
- use GENMASK and BIT for masks
- prevent attempting to sample multiple channels at once by moving a
mutex scop
- coding style cleanups
* bmg150_magn
- kconfig sort order was wrong - fix it.
* bmg160
- use i2c regmap and drop all uses of i2c_client
- separate i2c and core driver
* cc10001_adc
- kconfig sort order was wrong - fix it.
* evgen (dummy driver helper module)
- move interrupt generation to irq_work to reduce differences between
the dummy driver and real hardware drivers.
* hmc5843
- set the name dynamically rather than to a fixed value for one of the
suported parts.
- export module alias information to allow autoprobing of module.
* lpc32xx
- on failure to get resource or irq return -ENXIO as uppose to -EBUSY
* max1027
- set .of_match_table to actually allow OF style matching.
* max5821
- add MODULE_DEVICE_TABLE for OF table.
* mma8452
- refactor to separate out chip specific data.
- add freefall / motion interrupt source for devices that do their
interrupts slightly differently.
- update copywrite notice.
- leave naming of events directory in sysfs to the core
* mcp320x
- set .of_match_table so that it can be use for OF style matching.
* mlx90614
- Implement filter configuration (note the datasheet changed as a result
of the driver reviews to include the values we needed ;)
* opt3001
- drop .owner field as assigned by platform driver core.
* si7020
- replace a bitmask on the humidity values with a more correct range
check.
* stk310
- improved error handling.
- use BIT macro where appropriate and use the resulting defines
instead of magic numbers in the code.
- fix indentation
* st-sensors
- add debugfs register read hook
* tsl4531
- fix error handling in check_id
* twl6030
- fix module autoload for OF
* iio-trig-sysfs
- document add and remove attribute
* trigger in staging
- code alignment fixes.
- braces on both branches of if statement if needed for one.
* xilinx-xadc
- push interrupts into hardirq context as there isn't much in them
any more and it avoids breaking PREEMPT_RT builds due to the use
of a spinlock between the hardirq and the thread.
Tools
* event-monitor
- report unsupported events. We keep expanding what can come from drivers
so give a helpful error if one turns up in an out of date userspace
program.
* generic-buffer
- helpful message about needing to enable a channel to start the buffer.
Earlier patch 6ae459bda tried to detect void ckecksum partial
skb by comparing pull length to checksum offset. But it does
not work for all cases since checksum-offset depends on
updates to skb->data.
Following patch fixes it by validating checksum start offset
after skb-data pointer is updated. Negative value of checksum
offset start means there is no need to checksum.
Fixes: 6ae459bda ("skbuff: Fix skb checksum flag on skb pull")
Reported-by: Andrew Vagin <avagin@odin.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
There is a race between cpu hotplug handling and adding/deleting
gendisk for blk-mq, where both are trying to register and unregister
the same sysfs entries.
null_add_dev
--> blk_mq_init_queue
--> blk_mq_init_allocated_queue
--> add to 'all_q_list' (*)
--> add_disk
--> blk_register_queue
--> blk_mq_register_disk (++)
null_del_dev
--> del_gendisk
--> blk_unregister_queue
--> blk_mq_unregister_disk (--)
--> blk_cleanup_queue
--> blk_mq_free_queue
--> del from 'all_q_list' (*)
blk_mq_queue_reinit
--> blk_mq_sysfs_unregister (-)
--> blk_mq_sysfs_register (+)
While the request queue is added to 'all_q_list' (*),
blk_mq_queue_reinit() can be called for the queue anytime by CPU
hotplug callback. But blk_mq_sysfs_unregister (-) and
blk_mq_sysfs_register (+) in blk_mq_queue_reinit must not be called
before blk_mq_register_disk (++) and after blk_mq_unregister_disk (--)
is finished. Because '/sys/block/*/mq/' is not exists.
There has already been BLK_MQ_F_SYSFS_UP flag in hctx->flags which can
be used to track these sysfs stuff, but it is only fixing this issue
partially.
In order to fix it completely, we just need per-queue flag instead of
per-hctx flag with appropriate locking. So this introduces
q->mq_sysfs_init_done which is properly protected with all_q_mutex.
Also, we need to ensure that blk_mq_map_swqueue() is called with
all_q_mutex is held. Since hctx->nr_ctx is reset temporarily and
updated in blk_mq_map_swqueue(), so we should avoid
blk_mq_register_hctx() seeing the temporary hctx->nr_ctx value
in CPU hotplug handling or adding/deleting gendisk .
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: Ming Lei <tom.leiming@gmail.com>
Cc: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Pull RCU fixes from Paul E. McKenney, for two regressions
introduced in this merge window:
- Fix bug with recent GCCs.
- Fix false positive lockdep splat.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Pull networking fixes from David Miller:
1) When we run a tap on netlink sockets, we have to copy mmap'd SKBs
instead of cloning them. From Daniel Borkmann.
2) When converting classical BPF into eBPF, fix the setting of the
source reg to BPF_REG_X. From Tycho Andersen.
3) Fix igmpv3/mldv2 report parsing in the bridge multicast code, from
Linus Lussing.
4) Fix dst refcounting for ipv6 tunnels, from Martin KaFai Lau.
5) Set NLM_F_REPLACE flag properly when replacing ipv6 routes, from
Roopa Prabhu.
6) Add some new cxgb4 PCI device IDs, from Hariprasad Shenai.
7) Fix headroom tests and SKB leaks in ipv6 fragmentation code, from
Florian Westphal.
8) Check DMA mapping errors in bna driver, from Ivan Vecera.
9) Several 8139cp bug fixes (dev_kfree_skb_any in interrupt context,
misclearing of interrupt status in TX timeout handler, etc.) from
David Woodhouse.
10) In tipc, reset SKB header pointer after skb_linearize(), from Erik
Hugne.
11) Fix autobind races et al. in netlink code, from Herbert Xu with
help from Tejun Heo and others.
12) Missing SET_NETDEV_DEV in sunvnet driver, from Sowmini Varadhan.
13) Fix various races in timewait timer and reqsk_queue_hadh_req, from
Eric Dumazet.
14) Fix array overruns in mac80211, from Johannes Berg and Dan
Carpenter.
15) Fix data race in rhashtable_rehash_one(), from Dmitriy Vyukov.
16) Fix race between poll_one_napi and napi_disable, from Neil Horman.
17) Fix byte order in geneve tunnel port config, from John W Linville.
18) Fix handling of ARP replies over lightweight tunnels, from Jiri
Benc.
19) We can loop when fib rule dumps cross multiple SKBs, fix from Wilson
Kok and Roopa Prabhu.
20) Several reference count handling bug fixes in the PHY/MDIO layer
from Russel King.
21) Fix lockdep splat in ppp_dev_uninit(), from Guillaume Nault.
22) Fix crash in icmp_route_lookup(), from David Ahern.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (116 commits)
net: Fix panic in icmp_route_lookup
net: update docbook comment for __mdiobus_register()
ppp: fix lockdep splat in ppp_dev_uninit()
net: via/Kconfig: GENERIC_PCI_IOMAP required if PCI not selected
phy: marvell: add link partner advertised modes
net: fix net_device refcounting
phy: add phy_device_remove()
phy: fixed-phy: properly validate phy in fixed_phy_update_state()
net: fix phy refcounting in a bunch of drivers
of_mdio: fix MDIO phy device refcounting
phy: add proper phy struct device refcounting
phy: fix mdiobus module safety
net: dsa: fix of_mdio_find_bus() device refcount leak
phy: fix of_mdio_find_bus() device refcount leak
ip6_tunnel: Reduce log level in ip6_tnl_err() to debug
ip6_gre: Reduce log level in ip6gre_err() to debug
fib_rules: fix fib rule dumps across multiple skbs
bnx2x: byte swap rss_key to comply to Toeplitz specs
net: revert "net_sched: move tp->root allocation into fw_init()"
lwtunnel: remove source and destination UDP port config option
...
Avoid IRQs occupied by ISA IRQs when allocating IRQs for PCI link devices,
otherwise it may cause interrupt storm due to incompatible pin attributes.
This issue was triggered on a KVM virtual machine, which
1) uses IRQ9 for SCI in high level mode.
2) defines an PCI interrupt link device (LNKS) with IRQ9 as the only
possible irq.
3) has an PCI device referring to link device LNKS.
So it causes interrupt storm when enabling the PCI device because PCI IRQ
works in low level mode.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Pull another cgroup fix from Tejun Heo:
"The cgroup writeback support got inadvertently enabled for traditional
hierarchies revealing two regressions which are currently being worked
on. It shouldn't have been enabled on traditional hierarchies, so
disable it on them. This is enough to make the regressions go away
for people who aren't experimenting with cgroup"
* 'for-4.3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
cgroup, writeback: don't enable cgroup writeback on traditional hierarchies
Pull NFS client bugfixes from Trond Myklebust:
"Highlights include:
Stable patches:
- fix v4.2 SEEK on files over 2 gigs
- Fix a layout segment reference leak when pNFS I/O falls back to inband I/O.
- Fix recovery of recalled read delegations
Bugfixes:
- Fix a case where NFSv4 fails to send CLOSE after a server reboot
- Fix sunrpc to wait for connections to complete before retrying
- Fix sunrpc races between transport connect/disconnect and shutdown
- Fix an infinite loop when layoutget fail with BAD_STATEID
- nfs/filelayout: Fix NULL reference caused by double freeing of fh_array
- Fix a bogus WARN_ON_ONCE() in O_DIRECT when layout commit_through_mds is set
- Fix layoutreturn/close ordering issues"
* tag 'nfs-for-4.3-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFS41: make close wait for layoutreturn
NFS: Skip checking ds_cinfo.buckets when lseg's commit_through_mds is set
NFSv4.x/pnfs: Don't try to recover stateids twice in layoutget
NFSv4: Recovery of recalled read delegations is broken
NFS: Fix an infinite loop when layoutget fail with BAD_STATEID
NFS: Do cleanup before resetting pageio read/write to mds
SUNRPC: xs_sock_mark_closed() does not need to trigger socket autoclose
SUNRPC: Lock the transport layer on shutdown
nfs/filelayout: Fix NULL reference caused by double freeing of fh_array
SUNRPC: Ensure that we wait for connections to complete before retrying
SUNRPC: drop null test before destroy functions
nfs: fix v4.2 SEEK on files over 2 gigs
SUNRPC: Fix races between socket connection and destroy code
nfs: fix pg_test page count calculation
Failing to send a CLOSE if file is opened WRONLY and server reboots on a 4.x mount
Commit 96249d70dd ("IB/core: Guarantee that a local_dma_lkey
is available") allows ULPs that make use of the local dma key to keep
working as before by allocating a DMA MR with local permissions and
converted these consumers to use the MR associated with the PD
rather then device->local_dma_lkey.
ConnectIB has some known issues with memory registration
using the local_dma_lkey (SEND, RDMA, RECV seems to work ok).
Thus don't expose support for it (remove device->local_dma_lkey
setting), and take advantage of the above commit such that no regression
is introduced to working systems.
The local_dma_lkey support will be restored in CX4 depending on FW
capability query.
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Add a phy_device_remove() function to complement phy_device_register(),
which undoes the effects of phy_device_register() by removing the phy
device from visibility, but not freeing it.
This allows these details to be moved out of the mdio bus code into
the phy code where this action belongs.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Re-implement the mdiobus module refcounting to ensure that we actually
ensure that the mdiobus module code does not go away while we might call
into it.
The old scheme using bus->dev.driver was buggy, because bus->dev is a
class device which never has a struct device_driver associated with it,
and hence the associated code trying to obtain a refcount did nothing
useful.
Instead, take the approach that other subsystems do: pass the module
when calling mdiobus_register(), and record that in the mii_bus struct.
When we need to increment the module use count in the phy code, use
this stored pointer. When the phy is deteched, drop the module
refcount, remembering that the phy device might go away at that point.
This doesn't stop the mii_bus going away while there are in-use phys -
it merely stops the underlying code vanishing.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Pull thermal management fixes from Zhang Rui:
- Power allocator governor changes to allow binding on thermal zones
with missing power estimates information. From Javi Merino.
- Add compile test flags on thermal drivers that allow it without
producing compilation errors. From Eduardo Valentin.
- Fixes around memory allocation on cpu_cooling. From Javi Merino.
- Fix on db8500 cpufreq code to allow autoload. From Luis de
Bethencourt.
- Maintainer entries for cpu cooling device
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux:
thermal: power_allocator: exit early if there are no cooling devices
thermal: power_allocator: don't require tzp to be present for the thermal zone
thermal: power_allocator: relax the requirement of two passive trip points
thermal: power_allocator: relax the requirement of a sustainable_power in tzp
thermal: Add a function to get the minimum power
thermal: cpu_cooling: free power table on error or when unregistering
thermal: cpu_cooling: don't call kcalloc() under rcu_read_lock
thermal: db8500_cpufreq_cooling: Fix module autoload for OF platform driver
thermal: cpu_cooling: Add MAINTAINERS entry
thermal: ti-soc: Kconfig fix to avoid menu showing wrongly
thermal: ti-soc: allow compile test
thermal: qcom_spmi: allow compile test
thermal: exynos: allow compile test
thermal: armada: allow compile test
thermal: dove: allow compile test
thermal: kirkwood: allow compile test
thermal: rockchip: allow compile test
thermal: spear: allow compile test
thermal: hisi: allow compile test
thermal: Fix thermal_zone_of_sensor_register to match documentation
Merge misc fixes from Andrew Morton:
"15 fixes"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
ocfs2/dlm: fix deadlock when dispatch assert master
membarrier: clean up selftest
vmscan: fix sane_reclaim helper for legacy memcg
lib/iommu-common.c: do not try to deref a null iommu->lazy_flush() pointer when n < pool->hint
x86, efi, kasan: #undef memset/memcpy/memmove per arch
mm: migrate: hugetlb: putback destination hugepage to active list
mm, dax: VMA with vm_ops->pfn_mkwrite wants to be write-notified
userfaultfd: register uapi generic syscall (aarch64)
userfaultfd: selftest: don't error out if pthread_mutex_t isn't identical
userfaultfd: selftest: return an error if BOUNCE_VERIFY fails
userfaultfd: selftest: avoid my_bcmp false positives with powerpc
userfaultfd: selftest: only warn if __NR_userfaultfd is undefined
userfaultfd: selftest: headers fixup
userfaultfd: selftests: vm: pick up sanitized kernel headers
userfaultfd: revert "userfaultfd: waitqueue: add nr wake parameter to __wake_up_locked_key"
VXLAN device can receive skb with checksum partial. But the checksum
offset could be in outer header which is pulled on receive. This results
in negative checksum offset for the skb. Such skb can cause the assert
failure in skb_checksum_help(). Following patch fixes the bug by setting
checksum-none while pulling outer header.
Following is the kernel panic msg from old kernel hitting the bug.
------------[ cut here ]------------
kernel BUG at net/core/dev.c:1906!
RIP: 0010:[<ffffffff81518034>] skb_checksum_help+0x144/0x150
Call Trace:
<IRQ>
[<ffffffffa0164c28>] queue_userspace_packet+0x408/0x470 [openvswitch]
[<ffffffffa016614d>] ovs_dp_upcall+0x5d/0x60 [openvswitch]
[<ffffffffa0166236>] ovs_dp_process_packet_with_key+0xe6/0x100 [openvswitch]
[<ffffffffa016629b>] ovs_dp_process_received_packet+0x4b/0x80 [openvswitch]
[<ffffffffa016c51a>] ovs_vport_receive+0x2a/0x30 [openvswitch]
[<ffffffffa0171383>] vxlan_rcv+0x53/0x60 [openvswitch]
[<ffffffffa01734cb>] vxlan_udp_encap_recv+0x8b/0xf0 [openvswitch]
[<ffffffff8157addc>] udp_queue_rcv_skb+0x2dc/0x3b0
[<ffffffff8157b56f>] __udp4_lib_rcv+0x1cf/0x6c0
[<ffffffff8157ba7a>] udp_rcv+0x1a/0x20
[<ffffffff8154fdbd>] ip_local_deliver_finish+0xdd/0x280
[<ffffffff81550128>] ip_local_deliver+0x88/0x90
[<ffffffff8154fa7d>] ip_rcv_finish+0x10d/0x370
[<ffffffff81550365>] ip_rcv+0x235/0x300
[<ffffffff8151ba1d>] __netif_receive_skb+0x55d/0x620
[<ffffffff8151c360>] netif_receive_skb+0x80/0x90
[<ffffffff81459935>] virtnet_poll+0x555/0x6f0
[<ffffffff8151cd04>] net_rx_action+0x134/0x290
[<ffffffff810683d8>] __do_softirq+0xa8/0x210
[<ffffffff8162fe6c>] call_softirq+0x1c/0x30
[<ffffffff810161a5>] do_softirq+0x65/0xa0
[<ffffffff810687be>] irq_exit+0x8e/0xb0
[<ffffffff81630733>] do_IRQ+0x63/0xe0
[<ffffffff81625f2e>] common_interrupt+0x6e/0x6e
Reported-by: Anupam Chanda <achanda@vmware.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
inode_cgwb_enabled() gates cgroup writeback support. If it returns
true, each inode is attached to the corresponding memory domain which
gets mapped to io domain. It currently only tests whether the
filesystem and bdi support cgroup writeback; however, cgroup writeback
support doesn't work on traditional hierarchies and thus it should
also test whether memcg and iocg are on the default hierarchy.
This caused traditional hierarchy setups to hit the cgroup writeback
path inadvertently and ended up creating separate writeback domains
for each memcg and mapping them all to the root iocg uncovering a
couple issues in the cgroup writeback path.
cgroup writeback was never meant to be enabled on traditional
hierarchies. Make inode_cgwb_enabled() test whether both memcg and
iocg are on the default hierarchy.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Artem Bityutskiy <dedekind1@gmail.com>
Reported-by: Dexuan Cui <decui@microsoft.com>
Link: http://lkml.kernel.org/g/1443012552.19983.209.camel@gmail.com
Link: http://lkml.kernel.org/g/f30d4a6aa8a546ff88f73021d026a453@SIXPR30MB031.064d.mgd.msft.net
Pull spi fixes from Mark Brown:
"A disappointingly large collection of fixes for SPI issues, though
almost all in drivers (and there mainly the newly added Mediatek
driver) and the core fixes are documentation and error handling.
The driver fixes are all of the usual 'important if you see them'
variety"
* tag 'spi-fix-v4.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
spi: xtensa-xtfpga: fix register endianness
spi: meson: Fix module autoload for OF platform driver
spi: mediatek: fix wrong error return value on probe
spi: fix kernel-doc warnings in spi.h
spi: spidev: fix possible NULL dereference
spi: atmel: remove warning when !CONFIG_PM_SLEEP
spi: bcm2835: BUG: fix wrong use of PAGE_MASK
spi: mediatek: fix spi cs polarity error
spi: Fix documentation of spi_alloc_master()
spi: spi-pxa2xx: Check status register to determine if SSSR_TINT is disabled
spi: Mediatek: Document devicetree bindings update for spi bus
spi: mediatek: fix spi clock usage error
spi: mediatek: remove clk_disable_unprepare()
Drivers might call napi_disable while not holding the napi instance poll_lock.
In those instances, its possible for a race condition to exist between
poll_one_napi and napi_disable. That is to say, poll_one_napi only tests the
NAPI_STATE_SCHED bit to see if there is work to do during a poll, and as such
the following may happen:
CPU0 CPU1
ndo_tx_timeout napi_poll_dev
napi_disable poll_one_napi
test_and_set_bit (ret 0)
test_bit (ret 1)
reset adapter napi_poll_routine
If the adapter gets a tx timeout without a napi instance scheduled, its possible
for the adapter to think it has exclusive access to the hardware (as the napi
instance is now scheduled via the napi_disable call), while the netpoll code
thinks there is simply work to do. The result is parallel hardware access
leading to corrupt data structures in the driver, and a crash.
Additionaly, there is another, more critical race between netpoll and
napi_disable. The disabled napi state is actually identical to the scheduled
state for a given napi instance. The implication being that, if a napi instance
is disabled, a netconsole instance would see the napi state of the device as
having been scheduled, and poll it, likely while the driver was dong something
requiring exclusive access. In the case above, its fairly clear that not having
the rings in a state ready to be polled will cause any number of crashes.
The fix should be pretty easy. netpoll uses its own bit to indicate that that
the napi instance is in a state of being serviced by netpoll (NAPI_STATE_NPSVC).
We can just gate disabling on that bit as well as the sched bit. That should
prevent netpoll from conducting a napi poll if we convert its set bit to a
test_and_set_bit operation to provide mutual exclusion
Change notes:
V2)
Remove a trailing whtiespace
Resubmit with proper subject prefix
V3)
Clean up spacing nits
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: jmaxwell@redhat.com
Tested-by: jmaxwell@redhat.com
Signed-off-by: David S. Miller <davem@davemloft.net>
This reverts commit 51360155ec and adapts
fs/userfaultfd.c to use the old version of that function.
It didn't look robust to call __wake_up_common with "nr == 1" when we
absolutely require wakeall semantics, but we've full control of what we
insert in the two waitqueue heads of the blocked userfaults. No
exclusive waitqueue risks to be inserted into those two waitqueue heads
so we can as well stick to "nr == 1" of the old code and we can rely
purely on the fact no waitqueue inserted in one of the two waitqueue
heads we must enforce as wakeall, has wait->flags WQ_FLAG_EXCLUSIVE set.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull cgroup fixes from Tejun Heo:
"The threadgroup locking changes which went in during 4.2 devel cycle
added write locking of a percpu_rwsem in cgroup task migration path;
unfortunately, that involved expedited rcu syncing which turned out to
be too slow and heavy for certain workloads. The patchset which is
dependent on this one didn't get committed during that devel cycle, so
these two patches can be reverted safely.
Oleg reworked percpu_rwsem for 4.4 so that the writer path is a lot
lighter. The reported issue goes away with Oleg's reworked
percpu_rwsem and I'll reapply these patches on the for-4.4 branch so
that they can land together with Oleg's changes"
* 'for-4.3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
Revert "sched, cgroup: replace signal_struct->group_rwsem with a global percpu_rwsem"
Revert "cgroup: simplify threadgroup locking"
Code like this in inline functions confuses some recent versions of gcc:
const int n = const-expr;
whatever_t array[n];
For more details, see:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67055#c13
This compiler bug results in the following failure after 114b7fd4b (rcu:
Create rcu_sync infrastructure):
In file included from include/linux/rcupdate.h:429:0,
from include/linux/rcu_sync.h:5,
from kernel/rcu/sync.c:1:
include/linux/rcutiny.h: In function 'rcu_barrier_sched':
include/linux/rcutiny.h:55:20: internal compiler error: Segmentation fault
static inline void rcu_barrier_sched(void)
This commit therefore eliminates the constant local variable in favor of
direct use of the expression.
Reported-and-tested-by: Mark Salter <msalter@redhat.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Pull power management and ACPI updates from Rafael Wysocki:
"Included are: a somewhat late devfreq update which however is mostly
fixes and cleanups with one new thing only (the PPMUv2 support on
Exynos5433), an ACPI cpufreq driver fixup and two ACPI core cleanups
related to preprocessor directives.
Specifics:
- Fix a memory allocation size in the devfreq core (Xiaolong Ye).
- Fix a mistake in the exynos-ppmu DT binding (Javier Martinez
Canillas).
- Add support for PPMUv2 ((Platform Performance Monitoring Unit
version 2.0) on the Exynos5433 SoCs (Chanwoo Choi).
- Fix a type casting bug in the Exynos PPMU code (MyungJoo Ham).
- Assorted devfreq code cleanups and optimizations (Javi Merino,
MyungJoo Ham, Viresh Kumar).
- Fix up the ACPI cpufreq driver to use a more lightweight way to get
to its private data in the ->get() callback (Rafael J Wysocki).
- Fix a CONFIG_ prefix bug in one of the ACPI drivers and make the
ACPI subsystem use IS_ENABLED() instead of #ifdefs in function
bodies (Sudeep Holla)"
* tag 'pm+acpi-4.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
cpufreq: acpi-cpufreq: Use cpufreq_cpu_get_raw() in ->get()
ACPI: Eliminate CONFIG_.*{, _MODULE} #ifdef in favor of IS_ENABLED()
ACPI: int340x_thermal: add missing CONFIG_ prefix
PM / devfreq: Fix incorrect type issue.
PM / devfreq: tegra: Update governor to use devfreq_update_stats()
PM / devfreq: comments for get_dev_status usage updated
PM / devfreq: drop comment about thermal setting max_freq
PM / devfreq: cache the last call to get_dev_status()
PM / devfreq: Drop unlikely before IS_ERR(_OR_NULL)
PM / devfreq: exynos-ppmu: bit-wise operation bugfix.
PM / devfreq: exynos-ppmu: Update documentation to support PPMUv2
PM / devfreq: exynos-ppmu: Add the support of PPMUv2 for Exynos5433
PM / devfreq: event: Remove incorrect property in exynos-ppmu DT binding
Pull block updates from Jens Axboe:
"This is a bit bigger than it should be, but I could (did) not want to
send it off last week due to both wanting extra testing, and expecting
a fix for the bounce regression as well. In any case, this contains:
- Fix for the blk-merge.c compilation warning on gcc 5.x from me.
- A set of back/front SG gap merge fixes, from me and from Sagi.
This ensures that we honor SG gapping for integrity payloads as
well.
- Two small fixes for null_blk from Matias, fixing a leak and a
capacity propagation issue.
- A blkcg fix from Tejun, fixing a NULL dereference.
- A fast clone optimization from Ming, fixing a performance
regression since the arbitrarily sized bio's were introduced.
- Also from Ming, a regression fix for bouncing IOs"
* 'for-linus' of git://git.kernel.dk/linux-block:
block: fix bounce_end_io
block: blk-merge: fast-clone bio when splitting rw bios
block: blkg_destroy_all() should clear q->root_blkg and ->root_rl.blkg
block: Copy a user iovec if it includes gaps
block: Refuse adding appending a gapped integrity page to a bio
block: Refuse request/bio merges with gaps in the integrity payload
block: Check for gaps on front and back merges
null_blk: fix wrong capacity when bs is not 512 bytes
null_blk: fix memory leak on cleanup
block: fix bogus compiler warnings in blk-merge.c
* pm-cpufreq:
cpufreq: acpi-cpufreq: Use cpufreq_cpu_get_raw() in ->get()
* pm-devfreq:
PM / devfreq: Fix incorrect type issue.
PM / devfreq: tegra: Update governor to use devfreq_update_stats()
PM / devfreq: comments for get_dev_status usage updated
PM / devfreq: drop comment about thermal setting max_freq
PM / devfreq: cache the last call to get_dev_status()
PM / devfreq: Drop unlikely before IS_ERR(_OR_NULL)
PM / devfreq: exynos-ppmu: bit-wise operation bugfix.
PM / devfreq: exynos-ppmu: Update documentation to support PPMUv2
PM / devfreq: exynos-ppmu: Add the support of PPMUv2 for Exynos5433
PM / devfreq: event: Remove incorrect property in exynos-ppmu DT binding
Pull irq updates from Thomas Gleixner:
"This is a rather large update post rc1 due to the final steps of
cleanups and API changes which had to wait for the preparatory patches
to hit your tree.
- Regression fixes for ARM GIC irqchips
- Regression fixes and lockdep anotations for renesas irq chips
- The leftovers of the cleanup and preparatory patches which have
been ignored by maintainers
- Final conversions of the newly merged users of obsolete APIs
- Final removal of obsolete APIs
- Final removal of ARM artifacts which had been introduced during the
conversion of ARM to the generic interrupt code.
- Final split of the irq_data into chip specific and common data to
reflect the needs of hierarchical irq domains.
- Treewide removal of the first argument of interrupt flow handlers,
i.e. the irq number, which is not used by the majority of handlers
and simple to retrieve from the other argument the irq descriptor.
- A few comment updates and build warning fixes"
* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits)
arm64: Remove ununsed set_irq_flags
ARM: Remove ununsed set_irq_flags
sh: Kill off set_irq_flags usage
irqchip: Kill off set_irq_flags usage
gpu/drm: Kill off set_irq_flags usage
genirq: Remove irq argument from irq flow handlers
genirq: Move field 'msi_desc' from irq_data into irq_common_data
genirq: Move field 'affinity' from irq_data into irq_common_data
genirq: Move field 'handler_data' from irq_data into irq_common_data
genirq: Move field 'node' from irq_data into irq_common_data
irqchip/gic-v3: Use IRQD_FORWARDED_TO_VCPU flag
irqchip/gic: Use IRQD_FORWARDED_TO_VCPU flag
genirq: Provide IRQD_FORWARDED_TO_VCPU status flag
genirq: Simplify irq_data_to_desc()
genirq: Remove __irq_set_handler_locked()
pinctrl/pistachio: Use irq_set_handler_locked
gpio: vf610: Use irq_set_handler_locked
powerpc/mpc8xx: Use irq_set_handler_locked()
powerpc/ipic: Use irq_set_handler_locked()
powerpc/cpm2: Use irq_set_handler_locked()
...
Commit 718ba5b873, moved the responsibility for unlocking the socket to
xs_tcp_setup_socket, meaning that the socket will be unlocked before we
know that it has finished trying to connect. The following patch is based on
an initial patch by Russell King to ensure that we delay clearing the
XPRT_CONNECTING flag until we either know that we failed to initiate
a connection attempt, or the connection attempt itself failed.
Fixes: 718ba5b873 ("SUNRPC: Add helpers to prevent socket create from racing")
Reported-by: Russell King <linux@arm.linux.org.uk>
Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Lars-Peter Clausen