gpiolib: improve the robustness of watch/unwatch ioctl()

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This makes the new ioctl() a bit more robust - we now check if a line
is already being watched and return -EBUSY if the user-space tries to
start watching it again. Same for unwatch - return -EBUSY if user-space
tries to unwatch a line that's not being watched.

Fixes: 51c1064e82 ("gpiolib: add new ioctl() for monitoring changes in line info")
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

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Bartosz Golaszewski 2020-04-15 10:23:59 +02:00

parent dc87f6dd05

commit 4e15415930

1 changed files with 14 additions and 2 deletions

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drivers/gpio/gpiolib.c

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