diff options
| author | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-01-05 13:12:45 +0100 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-02-12 10:50:24 +0100 |
| commit | 8ce6fd81a452d554889874e50cd34e92cf4547d6 (patch) | |
| tree | d9c67f4a4f4f6471450bc7777cb26ad722926547 /drivers/gpio/gpiolib-of.c | |
| parent | e348544f7994d252427ed3ae637c7081cbb90f66 (diff) | |
gpio: of: assign and read the hog pointer atomically
The device nodes representing GPIO hogs cannot be deleted without
unregistering the GPIO chip so there's no need to serialize their access.
However we must ensure that users can get the right address so write and
read it atomically.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'drivers/gpio/gpiolib-of.c')
| -rw-r--r-- | drivers/gpio/gpiolib-of.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 35d717fd393f..523b047a2803 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -801,7 +801,7 @@ static int of_gpiochip_add_hog(struct gpio_chip *chip, struct device_node *hog) return ret; #ifdef CONFIG_OF_DYNAMIC - desc->hog = hog; + WRITE_ONCE(desc->hog, hog); #endif } @@ -849,7 +849,7 @@ static void of_gpiochip_remove_hog(struct gpio_chip *chip, struct gpio_desc *desc; for_each_gpio_desc_with_flag(chip, desc, FLAG_IS_HOGGED) - if (desc->hog == hog) + if (READ_ONCE(desc->hog) == hog) gpiochip_free_own_desc(desc); } |