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[37.248.157.105]) by smtp.gmail.com with ESMTPSA id r16-20020aa7d150000000b0051e19bf66a4sm5680666edo.83.2023.07.14.05.14.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Jul 2023 05:14:48 -0700 (PDT) From: Artur Weber To: Lee Jones Cc: Daniel Thompson , Jingoo Han , Helge Deller , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Artur Weber , dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht Subject: [PATCH 2/2] backlight: lp855x: Catch errors when changing brightness Date: Fri, 14 Jul 2023 14:14:40 +0200 Message-ID: <20230714121440.7717-3-aweber.kernel@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230714121440.7717-1-aweber.kernel@gmail.com> References: <20230714121440.7717-1-aweber.kernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org 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 Reviewed-by: Daniel Thompson --- drivers/video/backlight/lp855x_bl.c | 13 ++++++++----- 1 file 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 @@ 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 = {