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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2018-07-02 22:05:21 +0200 |
|---|---|---|
| committer | Jacek Anaszewski <jacek.anaszewski@gmail.com> | 2018-07-05 23:21:10 +0200 |
| commit | 2282e125a406e09331c5a785e3df29035c99a607 (patch) | |
| tree | b5936ee2bde7c85bf71aaff259026857b2bda6d9 /drivers/leds/trigger/ledtrig-backlight.c | |
| parent | 033692eb3ec8305f6e9998b297aaec6899680637 (diff) | |
| download | linux-2282e125a406e09331c5a785e3df29035c99a607.tar.gz linux-2282e125a406e09331c5a785e3df29035c99a607.tar.bz2 linux-2282e125a406e09331c5a785e3df29035c99a607.zip | |
leds: triggers: let struct led_trigger::activate() return an error code
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>
Diffstat (limited to 'drivers/leds/trigger/ledtrig-backlight.c')
| -rw-r--r-- | drivers/leds/trigger/ledtrig-backlight.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/leds/trigger/ledtrig-backlight.c b/drivers/leds/trigger/ledtrig-backlight.c index 1ca1f1608f76..84512960d630 100644 --- a/drivers/leds/trigger/ledtrig-backlight.c +++ b/drivers/leds/trigger/ledtrig-backlight.c @@ -97,7 +97,7 @@ static ssize_t bl_trig_invert_store(struct device *dev, } static DEVICE_ATTR(inverted, 0644, bl_trig_invert_show, bl_trig_invert_store); -static void bl_trig_activate(struct led_classdev *led) +static int bl_trig_activate(struct led_classdev *led) { int ret; @@ -107,7 +107,7 @@ static void bl_trig_activate(struct led_classdev *led) led->trigger_data = n; if (!n) { dev_err(led->dev, "unable to allocate backlight trigger\n"); - return; + return 0; } ret = device_create_file(led->dev, &dev_attr_inverted); @@ -124,11 +124,13 @@ static void bl_trig_activate(struct led_classdev *led) dev_err(led->dev, "unable to register backlight trigger\n"); led->activated = true; - return; + return 0; err_invert: led->trigger_data = NULL; kfree(n); + + return 0; } static void bl_trig_deactivate(struct led_classdev *led) |