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gpio: sysfs: extend the critical section for unregistering sysfs devices 

[ Upstream commit 59cba4a0e6ca1058fbf88fec22530a4e2841802a ]

Checking the gdev->mockdev pointer for NULL must be part of the critical
section.

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bartosz Golaszewski 2024-01-24 14:08:45 +01:00 committed by Greg Kroah-Hartman
parent 932490268c
commit 53b2f35399
1 changed files with 8 additions and 7 deletions
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15
drivers/gpio/gpiolib-sysfs.c
View File

@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/bitops.h>
#include <linux/cleanup.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/init.h>
@ -774,15 +775,15 @@ void gpiochip_sysfs_unregister(struct gpio_device *gdev)
struct gpio_desc *desc;
struct gpio_chip *chip = gdev->chip;
if (!gdev->mockdev)
return;
scoped_guard(mutex, &sysfs_lock) {
if (!gdev->mockdev)
return;
device_unregister(gdev->mockdev);
device_unregister(gdev->mockdev);
/* prevent further gpiod exports */
mutex_lock(&sysfs_lock);
gdev->mockdev = NULL;
mutex_unlock(&sysfs_lock);
/* prevent further gpiod exports */
gdev->mockdev = NULL;
}
/* unregister gpiod class devices owned by sysfs */
for_each_gpio_desc_with_flag(chip, desc, FLAG_SYSFS) {