linux-kernel - Re: [PATCH 4/4] gpiolib: cdev: replace locking wrappers for gpio

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Date: Wed, 20 Dec 2023 12:55:50 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Kent Gibson <warthog618@...il.com>, Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org, brgl@...ev.pl, 
	andy@...nel.org
Subject: Re: [PATCH 4/4] gpiolib: cdev: replace locking wrappers for
 gpio_device with guards

(+PeterZ)

On Wed, Dec 20, 2023 at 2:52 AM Kent Gibson <warthog618@...il.com> wrote:

> Replace the wrapping functions that inhibit removal of the gpio_device
> with equivalent guard macros.
>
> Signed-off-by: Kent Gibson <warthog618@...il.com>
(...)
> +DEFINE_CLASS(_read_sem_guard,
> +            struct rw_semaphore *,
> +            up_read(_T),
> +            ({
> +               down_read(sem);
> +               sem;
> +            }),
> +            struct rw_semaphore *sem);

Isn't this so generic that it should be in <linux/cleanup.h>?

Otherwise all the patches look good to me.

Yours,
Linus Walleij