linux-kernel - [PATCH 0/4] gpiolib: cdev: guard tidying

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Date: Wed, 20 Dec 2023 09:51:02 +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 0/4] gpiolib: cdev: guard tidying

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

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

Patch 1 adds a missing include.

Patch 2 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.

Patch 3 tidies up the functions that use a guard on the linereq
config_mutex.

Patch 4 tidies up the functions that use a guard on the gpio_device.
The new guard macro definitions probably should be relocated into
gpiolib.h, and I'll do that for v2 if there is a general consensus.

I also note that gpio_ioctl() is NOT covered by a guard to inhibit
removal of the gpio_device.  This looks like a bug to me, unless there
is some higher level locking at play that I am unaware of?

Cheers,
Kent.

Kent Gibson (4):
  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 | 263 +++++++++++-------------------------
 1 file changed, 79 insertions(+), 184 deletions(-)

--
2.39.2