leds: triggers: Flush pending brightness before activating trigger

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[ Upstream commit ab477b766e ]

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: 0db37915d9 ("leds: avoid races with workqueue")
Fixes: 8c0f693c6e ("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>

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This commit is contained in:

Thomas Weißschuh 2024-06-13 17:24:51 +02:00 • committed by Greg Kroah-Hartman

parent ab694f667a

commit 780785c77e

2 changed files with 6 additions and 5 deletions

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6

drivers/leds/led-triggers.c

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5

drivers/leds/trigger/ledtrig-timer.c

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