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5c3c067b60
The device_lock_assert() in unregister_port() fails to pick the right
device leading to splats like the following from:
echo "ACPI0017:00" > /sys/bus/platform/drivers/cxl_acpi/unbind
WARNING: CPU: 32 PID: 1147 at include/linux/device.h:787 unregister_port+0x49/0x50 [cxl_c
[..]
RIP: 0010:unregister_port+0x49/0x50 [cxl_core]
[..]
Call Trace:
<TASK>
release_nodes+0x63/0x80
devres_release_all+0x8b/0xc0
__device_release_driver+0x190/0x240
device_driver_detach+0x3e/0xa0
unbind_store+0x113/0x130
Fix it up to assert on the device_lock() for ACPI0017 for root and 1st
level ports, and parent ports for all the rest.
Fixes: 54cdbf845c ("cxl/port: Add a driver for 'struct cxl_port' objects")
Reported-by: Ben Widawsky <ben.widawsky@intel.com>
Reviewed-by: Ben Widawsky <ben.widawsky@intel.com>
Link: https://lore.kernel.org/r/164439224893.2941117.18331456248117887720.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Linux kernel
============
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In order to build the documentation, use ``make htmldocs`` or
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https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.