The intermediate value could overflow for large periods and levels.
Signed-off-by: Matthias Schiffer matthias.schiffer@ew.tq-group.com --- drivers/video/pwm_backlight.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/pwm_backlight.c b/drivers/video/pwm_backlight.c index d7c096923b3..46c16a8f447 100644 --- a/drivers/video/pwm_backlight.c +++ b/drivers/video/pwm_backlight.c @@ -63,7 +63,7 @@ static int set_pwm(struct pwm_backlight_priv *priv) int ret;
if (priv->period_ns) { - duty_cycle = priv->period_ns * (priv->cur_level - priv->min_level) / + duty_cycle = (u64)priv->period_ns * (priv->cur_level - priv->min_level) / (priv->max_level - priv->min_level); ret = pwm_set_config(priv->pwm, priv->channel, priv->period_ns, duty_cycle);