linux-kernel - [PATCH v2 0/5] gpiolib: cdev: guard tidying

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Date: Thu, 21 Dec 2023 09:20:35 +0800
From: Kent Gibson <warthog618@...il.com>
To: linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	brgl@...ev.pl,
	linus.walleij@...aro.org,
	andy@...nel.org
Cc: Kent Gibson <warthog618@...il.com>
Subject: [PATCH v2 0/5] gpiolib: cdev: guard tidying

This series contains some tidying up of gpiolib-cdev following the
recent adoption of guard().

The first patch is a fix to protect gpio_ioctl() from having the
gpio chip removed while the ioctl is in progress.

The next couple of patches are minor fixes inspired by recent
submissions and reviews for gpiolib.c.

Patch 2 adds a missing include.

Patch 3 switches allocation of struct linereq from kzalloc() to
kvzalloc() as it can be larger than one page - even more so after the
recent relocation of debounce_period_us.

The final two patches replace wrapper functions with guards.

Patch 4 tidies up the functions that use a guard on the linereq
config_mutex.

Patch 5 tidies up the functions that use a guard on the gpio_device.

Changes v1 -> v2:
 - add patch 1 to protect gpio_ioctl() from chip removal
 - improve commit comment (patch 3)
 - use guard(rwsem_read) rather than rolling our own (patch 5)

Cheers,
Kent.

Kent Gibson (5):
  gpiolib: cdev: add gpio_device locking wrapper around gpio_ioctl()
  gpiolib: cdev: include overflow.h
  gpiolib: cdev: allocate linereq using kvzalloc()
  gpiolib: cdev: replace locking wrappers for config_mutex with guards
  gpiolib: cdev: replace locking wrappers for gpio_device with guards

 drivers/gpio/gpiolib-cdev.c | 257 ++++++++++--------------------------
 1 file changed, 70 insertions(+), 187 deletions(-)

--
2.39.2