[PATCH] gpio: sysfs: add missing mutex_destroy()

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

We initialize the data->mutex in gpiod_export() but lack the
corresponding mutex_destroy() in gpiod_unexport() causing a resource
leak with mutex debugging enabled. Add the call right before kfreeing
the GPIO data.

Fixes: 6ffcb7971486 ("gpio: sysfs: use per-gpio locking")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
---
 drivers/gpio/gpiolib-sysfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index 4a3aa09dad9d..cd3381a4bc93 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -713,6 +713,7 @@ void gpiod_unexport(struct gpio_desc *desc)
 	}
 
 	put_device(dev);
+	mutex_destroy(&data->mutex);
 	kfree(data);
 }
 EXPORT_SYMBOL_GPL(gpiod_unexport);
-- 
2.45.2