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gpio: sysfs: repair export returning -EPERM on 1st attempt

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It would make sense to return -EPERM if the bit was already set (already
used), not if it was cleared. Before this fix pins can only be exported on
the 2nd attempt:

$ echo 522 > /sys/class/gpio/export
sh: write error: Operation not permitted
$ echo 522 > /sys/class/gpio/export

Fixes: 35b545332b ("gpio: remove gpio_lock")
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Alexander Sverdlin 2024-03-07 22:43:16 +01:00 committed by Bartosz Golaszewski
parent 297dc37a1e
commit 8636f19c2d
1 changed files with 1 additions and 1 deletions
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2
drivers/gpio/gpiolib-sysfs.c
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@ -593,7 +593,7 @@ int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
if (!guard.gc)
return -ENODEV;
if (!test_and_set_bit(FLAG_EXPORT, &desc->flags))
if (test_and_set_bit(FLAG_EXPORT, &desc->flags))
return -EPERM;
gdev = desc->gdev;