gpio: sysfs: fix chip removal with GPIOs exported over sysfs

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[ Upstream commit 6766f59012 ]

Currently if we export a GPIO over sysfs and unbind the parent GPIO
controller, the exported attribute will remain under /sys/class/gpio
because once we remove the parent device, we can no longer associate the
descriptor with it in gpiod_unexport() and never drop the final
reference.

Rework the teardown code: provide an unlocked variant of
gpiod_unexport() and remove all exported GPIOs with the sysfs_lock taken
before unregistering the parent device itself. This is done to prevent
any new exports happening before we unregister the device completely.

Cc: stable@vger.kernel.org
Fixes: 1cd53df733 ("gpio: sysfs: don't look up exported lines as class devices")
Link: https://patch.msgid.link/20260212133505.81516-1-bartosz.golaszewski@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Bartosz Golaszewski 2026-02-12 14:35:05 +01:00 • committed by Sasha Levin

parent 4ece5eb483

commit 54f463494e

1 changed files with 55 additions and 51 deletions

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drivers/gpio/gpiolib-sysfs.c

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