gpio: sysfs: fix race between gpiod export and unexport

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Make sure to deregister the class device (and release the irq) while
holding the sysfs lock in gpio_unexport to prevent racing with
gpio_export.

Note that this requires the recently introduced per-gpio locking to
avoid a deadlock with the kernfs active protection when waiting for the
attribute operations to drain during deregistration.

Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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Johan Hovold 2015-05-04 17:10:45 +02:00 • committed by Linus Walleij

parent 6ffcb79714

commit 72eba6f66a

1 changed files with 26 additions and 25 deletions

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51

drivers/gpio/gpiolib-sysfs.c

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