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gpiolib: sysfs: Do unexport GPIO when user asks for it

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It seems that sysfs interface implicitly relied on the gpiod_free() to
unexport the line. This is logically incorrect as core gpiolib should
not deal with sysfs so instead of restoring it, let's call
gpiod_unexport() from sysfs code.

Fixes: b0ce9ce408b6 ("gpiolib: Do not unexport GPIO on freeing")
Reported-by: Marek Behún <kabel@kernel.org>
Closes: https://lore.kernel.org/r/20230808102828.4a9eac09@dellmb
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Marek Behún <kabel@kernel.org>
[Bartosz: tweaked the commit message]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Andy Shevchenko 2023-08-14 14:26:15 +03:00 committed by Bartosz Golaszewski
parent 2fc8d02058
commit 20d9b3b5f2
1 changed files with 5 additions and 2 deletions
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7
drivers/gpio/gpiolib-sysfs.c
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@ -515,8 +515,9 @@ static ssize_t unexport_store(const struct class *class,
* they may be undone on its behalf too.
*/
if (test_and_clear_bit(FLAG_SYSFS, &desc->flags)) {
status = 0;
gpiod_unexport(desc);
gpiod_free(desc);
status = 0;
}
done:
if (status)
@ -781,8 +782,10 @@ void gpiochip_sysfs_unregister(struct gpio_device *gdev)
mutex_unlock(&sysfs_lock);
/* unregister gpiod class devices owned by sysfs */
for_each_gpio_desc_with_flag(chip, desc, FLAG_SYSFS)
for_each_gpio_desc_with_flag(chip, desc, FLAG_SYSFS) {
gpiod_unexport(desc);
gpiod_free(desc);
}
}
static int __init gpiolib_sysfs_init(void)