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| author | Thomas Weißschuh <linux@weissschuh.net> | 2024-06-13 18:24:51 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-08-11 13:35:53 +0300 |
| commit | 7118f979163db8066aa8411eb187d4cbebec60ab (patch) | |
| tree | 36c4263739cca629aac456edb4d31ea1ec0925da /drivers/leds/led-triggers.c | |
| parent | c3f8e2ec3c7b7d77c6dc7f288b3555fa9f6a4f24 (diff) | |
| download | linux-7118f979163db8066aa8411eb187d4cbebec60ab.tar.xz | |
leds: triggers: Flush pending brightness before activating trigger
[ Upstream commit ab477b766edd3bfb6321a6e3df4c790612613fae ]
The race fixed in timer_trig_activate() between a blocking
set_brightness() call and trigger->activate() can affect any trigger.
So move the call to flush_work() into led_trigger_set() where it can
avoid the race for all triggers.
Fixes: 0db37915d912 ("leds: avoid races with workqueue")
Fixes: 8c0f693c6eff ("leds: avoid flush_work in atomic context")
Cc: stable@vger.kernel.org
Tested-by: Dustin L. Howett <dustin@howett.net>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20240613-led-trigger-flush-v2-1-f4f970799d77@weissschuh.net
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/leds/led-triggers.c')
| -rw-r--r-- | drivers/leds/led-triggers.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c index fe7fb2e7149c..3d3673c197e3 100644 --- a/drivers/leds/led-triggers.c +++ b/drivers/leds/led-triggers.c @@ -200,6 +200,12 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) */ synchronize_rcu(); + /* + * If "set brightness to 0" is pending in workqueue, + * we don't want that to be reordered after ->activate() + */ + flush_work(&led_cdev->set_brightness_work); + ret = 0; if (trig->activate) ret = trig->activate(led_cdev); |