Re: [PATCH 10/22] gpiolib: cdev: fix minor race in GET_LINEINFO_WATCH

[Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>]

wt., 23 cze 2020 o 06:02 Kent Gibson <warthog618@xxxxxxxxx> napisał(a):
>
> Merge separate usage of test_bit/set_bit into test_and_set_bit to remove
> the possibility of a race between the test and set.
>
> Similarly test_bit and clear_bit.
>
> In the existing code it is possible for two threads to race past the
> test_bit and then set or clear the watch bit, and neither return EBUSY.
>
> Signed-off-by: Kent Gibson <warthog618@xxxxxxxxx>
>

Reviewed-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>