diff options
| author | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-01-02 16:59:48 +0100 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-01-04 10:29:16 +0100 |
| commit | 1979a28075470ef82472a5656ecc969f901e0d3b (patch) | |
| tree | 12b01c23e316fe05b646bad05b66d5e03127789a /drivers/gpio/gpiolib.h | |
| parent | 48e1b4d369cfe2729138a128afa6b8a55d093eaf (diff) | |
gpiolib: replace the GPIO device mutex with a read-write semaphore
There are only two spots where we modify (add to or remove objects from)
the GPIO device list. Readers should be able to access it concurrently.
Replace the mutex with a read-write semaphore and adjust the locking
operations accordingly.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib.h')
| -rw-r--r-- | drivers/gpio/gpiolib.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index 0ce7451a6b24..97df54abf57a 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -137,7 +137,7 @@ int gpiod_set_transitory(struct gpio_desc *desc, bool transitory); extern spinlock_t gpio_lock; extern struct list_head gpio_devices; -extern struct mutex gpio_devices_lock; +extern struct rw_semaphore gpio_devices_sem; void gpiod_line_state_notify(struct gpio_desc *desc, unsigned long action); |