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leds: triggers: let struct led_trigger::activate() return an error code

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Given that activating a trigger can fail, let the callback return an
indication. This prevents to have a trigger active according to the
"trigger" sysfs attribute but not functional.

All users are changed accordingly to return 0 for now. There is no intended
change in behaviour.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Uwe Kleine-König 2018-07-02 22:05:21 +02:00 • committed by Jacek Anaszewski
commit 2282e125a4
16 changed files with 101 additions and 45 deletions
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