led_set_brightness() involves scheduling a workqueue. As here the led's
brightness setting is done in context of the trigger's workqueue this is
unjustified overhead and it's more sensible to use
led_set_brightness_sync().
Reported-by: Pavel Machek <pavel@xxxxxx>
Fixes: fd4a641ac88f ("leds: trigger: implement a tty trigger")
Acked-by: Pavel Machek <pavel@xxxxxx>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
---
drivers/leds/trigger/ledtrig-tty.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/leds/trigger/ledtrig-tty.c b/drivers/leds/trigger/ledtrig-tty.c
index af61281dc6a1..f62db7e520b5 100644
--- a/drivers/leds/trigger/ledtrig-tty.c
+++ b/drivers/leds/trigger/ledtrig-tty.c
@@ -122,12 +122,12 @@ static void ledtrig_tty_work(struct work_struct *work)
if (icount.rx != trigger_data->rx ||
icount.tx != trigger_data->tx) {
- led_set_brightness(trigger_data->led_cdev, LED_ON);
+ led_set_brightness_sync(trigger_data->led_cdev, LED_ON);
trigger_data->rx = icount.rx;
trigger_data->tx = icount.tx;
} else {
- led_set_brightness(trigger_data->led_cdev, LED_OFF);
+ led_set_brightness_sync(trigger_data->led_cdev, LED_OFF);
}
out:
--
2.29.2
