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| author | Artur Weber <aweber.kernel@gmail.com> | 2023-07-14 14:14:40 +0200 |
|---|---|---|
| committer | Lee Jones <lee@kernel.org> | 2023-07-28 10:22:38 +0100 |
| commit | 5145531be5fbad0e914d1dc1cbd392d7b756abaa (patch) | |
| tree | e30934ed1f8e48514b0ec41de9eb9d365cf28f60 /drivers/video/backlight | |
| parent | 4c09e20b3c85f60353ace21092e34f35f5e3ab00 (diff) | |
| download | lwn-5145531be5fbad0e914d1dc1cbd392d7b756abaa.tar.gz lwn-5145531be5fbad0e914d1dc1cbd392d7b756abaa.zip | |
backlight: lp855x: Catch errors when changing brightness
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>
Link: https://lore.kernel.org/r/20230714121440.7717-3-aweber.kernel@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
Diffstat (limited to 'drivers/video/backlight')
| -rw-r--r-- | drivers/video/backlight/lp855x_bl.c | 13 |
1 files changed, 8 insertions, 5 deletions
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 @@ err: 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 = { |