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Bartosz Golaszewski efb8235bfd gpiolib: revert the attempt to protect the GPIO device list with an rwsem 
This reverts commits 1979a28075 ("gpiolib: replace the GPIO device
mutex with a read-write semaphore") and 65a828bab1 ("gpiolib: use
a mutex to protect the list of GPIO devices").

Unfortunately the legacy GPIO API that's still used in older code has to
translate numbers from the global GPIO numberspace to descriptors. This
results in a GPIO device lookup in every call to legacy functions. Some
of those functions - like gpio_set/get_value() - can be called from
atomic context so taking a sleeping lock that is an RW semaphore results
in an error.

We'll probably have to protect this list with SRCU.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/linux-wireless/f7b5ff1e-8f34-4d98-a7be-b826cb897dc8@moroto.mountain/
Fixes: 1979a28075 ("gpiolib: replace the GPIO device mutex with a read-write semaphore")
Fixes: 65a828bab1 ("gpiolib: use a mutex to protect the list of GPIO devices")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2024-01-17 09:52:37 +01:00
arch sound updates for 6.8-rc1 2024-01-12 11:55:28 -08:00
block for-6.8/block-2024-01-08 2024-01-11 13:58:04 -08:00
certs
crypto
Documentation dt-bindings: gpio: xilinx: Fix node address in gpio 2024-01-15 11:09:42 +01:00
drivers gpiolib: revert the attempt to protect the GPIO device list with an rwsem 2024-01-17 09:52:37 +01:00
fs f2fs update for 6.8-rc1 2024-01-11 20:39:15 -08:00
include gpiolib: Fix scope-based gpio_device refcounting 2024-01-15 18:41:29 +01:00
init
io_uring for-6.8/io_uring-2024-01-08 2024-01-11 14:19:23 -08:00
ipc
kernel dma-mapping updates for Linux 6.8 2024-01-11 13:46:50 -08:00
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net for-6.8/io_uring-2024-01-08 2024-01-11 14:19:23 -08:00
rust Rust changes for v6.8 2024-01-11 13:05:41 -08:00
samples
scripts Another moderately busy cycle for documentation, including: 2024-01-11 19:46:52 -08:00
security misc cleanups (the part that hadn't been picked by individual fs trees) 2024-01-11 20:23:50 -08:00
sound sound updates for 6.8-rc1 2024-01-12 11:55:28 -08:00
tools sound updates for 6.8-rc1 2024-01-12 11:55:28 -08:00
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CREDITS Another moderately busy cycle for documentation, including: 2024-01-11 19:46:52 -08:00
Kbuild
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MAINTAINERS linux-watchdog 6.8-rc1 tag 2024-01-12 13:32:30 -08:00
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README

README 

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

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    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.