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gpio fixes for v6.5-rc6

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- fix a regression in the sysfs interface
 - fix a reference counting bug that's been around for years
 - MAINTAINERS update
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Merge tag 'gpio-fixes-for-v6.5-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

Pull gpio fixes from Bartosz Golaszewski:

 - fix a regression in the sysfs interface

 - fix a reference counting bug that's been around for years

 - MAINTAINERS update

* tag 'gpio-fixes-for-v6.5-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  gpiolib: fix reference leaks when removing GPIO chips still in use
  gpiolib: sysfs: Do unexport GPIO when user asks for it
  MAINTAINERS: add content regex for gpio-regmap
This commit is contained in:
Linus Torvalds 2023-08-18 20:36:49 +02:00
commit 3e13eee105
3 changed files with 17 additions and 7 deletions
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1
MAINTAINERS
View File

@ -8812,6 +8812,7 @@ R: Michael Walle <michael@walle.cc>
S: Maintained
F: drivers/gpio/gpio-regmap.c
F: include/linux/gpio/regmap.h
K: (devm_)?gpio_regmap_(un)?register
GPIO SUBSYSTEM
M: Linus Walleij <linus.walleij@linaro.org>

7
drivers/gpio/gpiolib-sysfs.c
View File

@ -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)

16
drivers/gpio/gpiolib.c
View File

@ -2167,12 +2167,18 @@ static bool gpiod_free_commit(struct gpio_desc *desc)
void gpiod_free(struct gpio_desc *desc)
{
if (desc && desc->gdev && gpiod_free_commit(desc)) {
module_put(desc->gdev->owner);
gpio_device_put(desc->gdev);
} else {
/*
* We must not use VALIDATE_DESC_VOID() as the underlying gdev->chip
* may already be NULL but we still want to put the references.
*/
if (!desc)
return;
if (!gpiod_free_commit(desc))
WARN_ON(extra_checks);
}
module_put(desc->gdev->owner);
gpio_device_put(desc->gdev);
}
/**