Re: [PATCH] gpiolib: Drop cargo-culted comment

Kent Gibson
2023-11-25T02:46:59Z

On Sat, Nov 25, 2023 at 12:25:47AM +0100, Linus Walleij wrote:
> This comment about the gpio_lock is just completely confusing and
> misleading. This refers to a gpio_desc that would in 2008 be used
> to hold the list of gpio_chips, but nowadays gpio_desc refers to
> descriptors of individual GPIO lines and this comment is completely
> unparseable. Delete it.
>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> drivers/gpio/gpiolib.c | 4 ----
> 1 file changed, 4 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 95d2a7b2ea3e..1c47af866bf6 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -86,10 +86,6 @@ static struct bus_type gpio_bus_type = {
> */
> #define FASTPATH_NGPIO CONFIG_GPIOLIB_FASTPATH_LIMIT
>
> -/* gpio_lock prevents conflicts during gpio_desc[] table updates.
> - * While any GPIO is requested, its gpio_chip is not removable;
> - * each GPIO's "requested" flag serves as a lock and refcount.
> - */

Perhaps provide a comment as to what the gpio_lock DOES cover?

> DEFINE_SPINLOCK(gpio_lock);
>
> static DEFINE_MUTEX(gpio_lookup_lock);
>
> ---
> base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
> change-id: 20231125-dropcomment-89e5b7b4cc3f
>
> Best regards,
> --
> Linus Walleij <linus.walleij@linaro.org>
>