diff mbox series

[2/2] backlight: lp855x: Catch errors when changing brightness

Message ID 20230714121440.7717-3-aweber.kernel@gmail.com
State New
Headers show
Series backlight: lp855x: Fixes after c1ff7da03e16 | expand

Commit Message

Artur Weber July 14, 2023, 12:14 p.m. UTC 
The lp855x_bl_update_status function's return type is int, but
it always returns 0, without checking for the results of the
write_byte/pwm_ctrl functions called within.

Make this function return the return values of the functions it
calls, and modify the lp855x_pwm_ctrl function to return errors.

Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
---
 drivers/video/backlight/lp855x_bl.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

Comments

Daniel Thompson July 17, 2023, 8:39 a.m. UTC | #1 
On Fri, Jul 14, 2023 at 02:14:40PM +0200, Artur Weber wrote:
> The lp855x_bl_update_status function's return type is int, but
> it always returns 0, without checking for the results of the
> write_byte/pwm_ctrl functions called within.
>
> Make this function return the return values of the functions it
> calls, and modify the lp855x_pwm_ctrl function to return errors.
>
> Signed-off-by: Artur Weber <aweber.kernel@gmail.com>

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
diff mbox series

Patch

diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index 349ec324bc1e..61a7f45bfad8 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -217,7 +217,7 @@  static int lp855x_configure(struct lp855x *lp)
 	return ret;
 }
 
-static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
+static int lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
 {
 	struct pwm_state state;
 
@@ -234,23 +234,26 @@  static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
 	state.duty_cycle = div_u64(br * state.period, max_br);
 	state.enabled = state.duty_cycle;
 
-	pwm_apply_state(lp->pwm, &state);
+	return pwm_apply_state(lp->pwm, &state);
 }
 
 static int lp855x_bl_update_status(struct backlight_device *bl)
 {
 	struct lp855x *lp = bl_get_data(bl);
 	int brightness = bl->props.brightness;
+	int ret;
 
 	if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
 		brightness = 0;
 
 	if (lp->mode == PWM_BASED)
-		lp855x_pwm_ctrl(lp, brightness, bl->props.max_brightness);
+		ret = lp855x_pwm_ctrl(lp, brightness,
+				      bl->props.max_brightness);
 	else if (lp->mode == REGISTER_BASED)
-		lp855x_write_byte(lp, lp->cfg->reg_brightness, (u8)brightness);
+		ret = lp855x_write_byte(lp, lp->cfg->reg_brightness,
+					(u8)brightness);
 
-	return 0;
+	return ret;
 }
 
 static const struct backlight_ops lp855x_bl_ops = {