gpio: mt7621: more robust management of IRQ domain teardown

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The driver uses devm_gpiochip_add_data() to register the GPIO chips which
means the devres subsystem will unregister them only after the function
'mt7621_gpio_remove()' returns. During the window between domain destruction
and devres unregistering the GPIO chips, the chips are still fully active.
If a consumer or userspace invokes gpiod_to_irq() during this window,
'mt7621_gpio_to_irq()' can dereference the already-freed irq domain pointer.
Thus, manage the IRQ domain teardown using 'devm_add_action_or_reset()' to
guarantee it is destroyed strictly after the GPIO chips are removed.

Cc: stable@vger.kernel.org
Reported-by: Sashiko <sashiko-bot@kernel.org>
Fixes: a46f2e5720 ("gpio: mt7621: fix interrupt banks mapping on gpio chips")
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://patch.msgid.link/20260626060112.2498324-3-sergio.paracuellos@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

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Sergio Paracuellos 2026-06-26 08:01:10 +02:00 • committed by Bartosz Golaszewski

parent 1781172526

commit 839738536a

1 changed files with 7 additions and 8 deletions

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drivers/gpio/gpio-mt7621.c

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