diff mbox series

[7/8] backlight: lm3630a_bl: Remove invalid checks for unsigned int < 0

Message ID 20200624145721.2590327-8-lee.jones@linaro.org
State Accepted
Commit 3e799ccda3651a43ef3b366f70101e16e5054865
Headers show
Series [1/8] backlight: lms501kf03: Remove unused const variables | expand

Commit Message

Lee Jones June 24, 2020, 2:57 p.m. UTC
unsigned ints 'sources' and 'bank' cannot be less than LM3630A_SINK_0 (0)
and LM3630A_BANK_0 (0) respecitively, so change the logic to only check
for thier two possible valid values.

Fixes W=1 warnings:

 drivers/video/backlight/lm3630a_bl.c: In function ‘lm3630a_parse_led_sources’:
 drivers/video/backlight/lm3630a_bl.c:394:18: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
 394 | if (sources[i] < LM3630A_SINK_0 || sources[i] > LM3630A_SINK_1)
 | ^
 drivers/video/backlight/lm3630a_bl.c: In function ‘lm3630a_parse_bank’:
 drivers/video/backlight/lm3630a_bl.c:415:11: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
 415 | if (bank < LM3630A_BANK_0 || bank > LM3630A_BANK_1)
 | ^

Cc: <stable@vger.kernel.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Daniel Jeong <gshark.jeong@gmail.com>
Cc: LDD MLP <ldd-mlp@list.ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

---
 drivers/video/backlight/lm3630a_bl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
2.25.1

Comments

Daniel Thompson June 25, 2020, 9:45 a.m. UTC | #1
On Wed, Jun 24, 2020 at 03:57:20PM +0100, Lee Jones wrote:
> unsigned ints 'sources' and 'bank' cannot be less than LM3630A_SINK_0 (0)
> and LM3630A_BANK_0 (0) respecitively, so change the logic to only check
> for thier two possible valid values.
> 
> Fixes W=1 warnings:
> 
>  drivers/video/backlight/lm3630a_bl.c: In function ‘lm3630a_parse_led_sources’:
>  drivers/video/backlight/lm3630a_bl.c:394:18: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
>  394 | if (sources[i] < LM3630A_SINK_0 || sources[i] > LM3630A_SINK_1)
>  | ^
>  drivers/video/backlight/lm3630a_bl.c: In function ‘lm3630a_parse_bank’:
>  drivers/video/backlight/lm3630a_bl.c:415:11: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
>  415 | if (bank < LM3630A_BANK_0 || bank > LM3630A_BANK_1)
>  | ^
> 
> Cc: <stable@vger.kernel.org>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> Cc: Daniel Jeong <gshark.jeong@gmail.com>
> Cc: LDD MLP <ldd-mlp@list.ti.com>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>

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


> ---
>  drivers/video/backlight/lm3630a_bl.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/video/backlight/lm3630a_bl.c b/drivers/video/backlight/lm3630a_bl.c
> index ee320883b7108..e88a2b0e59046 100644
> --- a/drivers/video/backlight/lm3630a_bl.c
> +++ b/drivers/video/backlight/lm3630a_bl.c
> @@ -391,7 +391,7 @@ static int lm3630a_parse_led_sources(struct fwnode_handle *node,
>  		return ret;
>  
>  	for (i = 0; i < num_sources; i++) {
> -		if (sources[i] < LM3630A_SINK_0 || sources[i] > LM3630A_SINK_1)
> +		if (sources[i] != LM3630A_SINK_0 && sources[i] != LM3630A_SINK_1)
>  			return -EINVAL;
>  
>  		ret |= BIT(sources[i]);
> @@ -412,7 +412,7 @@ static int lm3630a_parse_bank(struct lm3630a_platform_data *pdata,
>  	if (ret)
>  		return ret;
>  
> -	if (bank < LM3630A_BANK_0 || bank > LM3630A_BANK_1)
> +	if (bank != LM3630A_BANK_0 && bank != LM3630A_BANK_1)
>  		return -EINVAL;
>  
>  	led_sources = lm3630a_parse_led_sources(node, BIT(bank));
> -- 
> 2.25.1
>
diff mbox series

Patch

diff --git a/drivers/video/backlight/lm3630a_bl.c b/drivers/video/backlight/lm3630a_bl.c
index ee320883b7108..e88a2b0e59046 100644
--- a/drivers/video/backlight/lm3630a_bl.c
+++ b/drivers/video/backlight/lm3630a_bl.c
@@ -391,7 +391,7 @@  static int lm3630a_parse_led_sources(struct fwnode_handle *node,
 		return ret;
 
 	for (i = 0; i < num_sources; i++) {
-		if (sources[i] < LM3630A_SINK_0 || sources[i] > LM3630A_SINK_1)
+		if (sources[i] != LM3630A_SINK_0 && sources[i] != LM3630A_SINK_1)
 			return -EINVAL;
 
 		ret |= BIT(sources[i]);
@@ -412,7 +412,7 @@  static int lm3630a_parse_bank(struct lm3630a_platform_data *pdata,
 	if (ret)
 		return ret;
 
-	if (bank < LM3630A_BANK_0 || bank > LM3630A_BANK_1)
+	if (bank != LM3630A_BANK_0 && bank != LM3630A_BANK_1)
 		return -EINVAL;
 
 	led_sources = lm3630a_parse_led_sources(node, BIT(bank));