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Nicholas Piggin 79340bda01 rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops

commit 682e6b4da5 upstream.

The OPAL RTC driver does not sleep in case it gets OPAL_BUSY or
OPAL_BUSY_EVENT from firmware, which causes large scheduling
latencies, up to 50 seconds have been observed here when RTC stops
responding (BMC reboot can do it).

Fix this by converting it to the standard form OPAL_BUSY loop that
sleeps.

Fixes: 628daa8d5a ("powerpc/powernv: Add RTC and NVRAM support plus RTAS fallbacks")
Cc: stable@vger.kernel.org # v3.2+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-05-01 12:58:24 -07:00

arch

rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops

2018-05-01 12:58:24 -07:00

block

bfq-iosched: ensure to clear bic/bfqq pointers when preparing request

2018-05-01 12:58:19 -07:00

certs

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

crypto

crypto: drbg - set freed buffers to NULL

2018-05-01 12:58:23 -07:00

Documentation

s390: introduce CPU alternatives

2018-04-29 11:33:14 +02:00

drivers

rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops

2018-05-01 12:58:24 -07:00

firmware

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

ext4: fix bitmap position validation

2018-05-01 12:58:07 -07:00

include

earlycon: Use a pointer table to fix __earlycon_table stride

2018-05-01 12:58:24 -07:00

init

kmemcheck: stop using GFP_NOTRACK and SLAB_NOTRACK

2018-02-22 15:42:23 +01:00

ipc

ipc/shm: fix use-after-free of shm file via remap_file_pages()

2018-04-24 09:36:23 +02:00

kernel

tracing: Fix missing tab for hwlat_detector print format

2018-04-29 11:33:17 +02:00

lib

kobject: don't use WARN for registration failures

2018-05-01 12:58:19 -07:00

mm/fadvise: discard partial page if endbyte is also EOF

2018-04-26 11:02:15 +02:00

net

libceph: validate con->state at the top of try_write()

2018-05-01 12:58:23 -07:00

samples

samples/bpf: Partially fixes the bpf.o build

2018-04-26 11:02:12 +02:00

scripts

kconfig: Fix expr_free() E_NOT leak

2018-04-26 11:02:08 +02:00

security

commoncap: Handle memory allocation failure.

2018-04-29 11:33:16 +02:00

sound

ASoC: fsl_esai: Fix divisor calculation failure at lower ratio

2018-05-01 12:58:23 -07:00

tools

perf test: Fix test trace+probe_libc_inet_pton.sh for s390x

2018-04-26 11:02:20 +02:00

usr

initramfs: fix initramfs rebuilds w/ compression after disabling

2017-11-03 07:39:19 -07:00

virt

KVM: arm/arm64: Close VMID generation race

2018-05-01 12:58:22 -07:00

.cocciconfig

scripts: add Linux .cocciconfig for coccinelle

2016-07-22 12:13:39 +02:00

.get_maintainer.ignore

…

.gitattributes

.gitattributes: set git diff driver for C source code files

2016-10-07 18:46:30 -07:00

.gitignore

kbuild: rpm-pkg: keep spec file until make mrproper

2018-02-13 10:19:46 +01:00

.mailmap

.mailmap: Add Maciej W. Rozycki's Imagination e-mail address

2017-11-10 12:16:15 -08:00

COPYING

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CREDITS

MAINTAINERS: update TPM driver infrastructure changes

2017-11-09 17:58:40 -08:00

Kbuild

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

Kconfig

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

MAINTAINERS

dt-bindings: Document mti,mips-cpc binding

2018-03-15 10:54:35 +01:00

Makefile

Linux 4.14.38

2018-04-29 11:33:18 +02:00

README

README: add a new README file, pointing to the Documentation/

2016-10-24 08:12:35 -02:00

README

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.