* leds/lm3642: simplify error handling, remove user-triggerable errors
@ 2018-12-27 19:55 Pavel Machek
2018-12-28 17:14 ` Jacek Anaszewski
0 siblings, 1 reply; 2+ messages in thread
From: Pavel Machek @ 2018-12-27 19:55 UTC (permalink / raw)
To: jacek.anaszewski, linux-leds, linux-kernel
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Doing goto just to return is unneccessarily complex, simplify code a
bit.
Drop dev_err()s that can be triggered by user.
Signed-off-by: Pavel Machek <pavel@ucw.cz>
diff --git a/drivers/leds/leds-lm3642.c b/drivers/leds/leds-lm3642.c
index cada084..62fc752 100644
--- a/drivers/leds/leds-lm3642.c
+++ b/drivers/leds/leds-lm3642.c
@@ -110,7 +110,7 @@ static int lm3642_control(struct lm3642_chip_data *chip,
ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
if (ret < 0) {
dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
- goto out;
+ return ret;
}
if (chip->last_flag)
@@ -150,11 +150,11 @@ static int lm3642_control(struct lm3642_chip_data *chip,
break;
default:
- return ret;
+ return -EINVAL;
}
if (ret < 0) {
dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
- goto out;
+ return ret;
}
if (chip->tx_pin)
@@ -163,13 +163,12 @@ static int lm3642_control(struct lm3642_chip_data *chip,
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
MODE_BITS_MASK << MODE_BITS_SHIFT,
opmode << MODE_BITS_SHIFT);
-out:
return ret;
}
/* torch */
-/* torch pin config for lm3642*/
+/* torch pin config for lm3642 */
static ssize_t lm3642_torch_pin_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
@@ -182,7 +181,7 @@ static ssize_t lm3642_torch_pin_store(struct device *dev,
ret = kstrtouint(buf, 10, &state);
if (ret)
- goto out_strtoint;
+ return ret;
if (state != 0)
state = 0x01 << TORCH_PIN_EN_SHIFT;
@@ -190,16 +189,12 @@ static ssize_t lm3642_torch_pin_store(struct device *dev,
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
state);
- if (ret < 0)
- goto out;
+ if (ret < 0) {
+ dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
+ return ret;
+ }
return size;
-out:
- dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
- return ret;
-out_strtoint:
- dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
- return ret;
}
static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);
@@ -233,7 +228,7 @@ static ssize_t lm3642_strobe_pin_store(struct device *dev,
ret = kstrtouint(buf, 10, &state);
if (ret)
- goto out_strtoint;
+ return ret;
if (state != 0)
state = 0x01 << STROBE_PIN_EN_SHIFT;
@@ -241,16 +236,12 @@ static ssize_t lm3642_strobe_pin_store(struct device *dev,
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
state);
- if (ret < 0)
- goto out;
+ if (ret < 0) {
+ dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
+ return ret;
+ }
return size;
-out:
- dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
- return ret;
-out_strtoint:
- dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
- return ret;
}
static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: leds/lm3642: simplify error handling, remove user-triggerable errors
2018-12-27 19:55 leds/lm3642: simplify error handling, remove user-triggerable errors Pavel Machek
@ 2018-12-28 17:14 ` Jacek Anaszewski
0 siblings, 0 replies; 2+ messages in thread
From: Jacek Anaszewski @ 2018-12-28 17:14 UTC (permalink / raw)
To: Pavel Machek, linux-leds, linux-kernel
Hi Pavel,
Thank you for the patch.
On 12/27/18 8:55 PM, Pavel Machek wrote:
> Doing goto just to return is unneccessarily complex, simplify code a
> bit.
>
> Drop dev_err()s that can be triggered by user.
>
>
> Signed-off-by: Pavel Machek <pavel@ucw.cz>
>
> diff --git a/drivers/leds/leds-lm3642.c b/drivers/leds/leds-lm3642.c
> index cada084..62fc752 100644
> --- a/drivers/leds/leds-lm3642.c
> +++ b/drivers/leds/leds-lm3642.c
> @@ -110,7 +110,7 @@ static int lm3642_control(struct lm3642_chip_data *chip,
> ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
> if (ret < 0) {
> dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
> - goto out;
> + return ret;
> }
>
> if (chip->last_flag)
> @@ -150,11 +150,11 @@ static int lm3642_control(struct lm3642_chip_data *chip,
> break;
>
> default:
> - return ret;
> + return -EINVAL;
> }
> if (ret < 0) {
> dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
> - goto out;
> + return ret;
> }
>
> if (chip->tx_pin)
> @@ -163,13 +163,12 @@ static int lm3642_control(struct lm3642_chip_data *chip,
> ret = regmap_update_bits(chip->regmap, REG_ENABLE,
> MODE_BITS_MASK << MODE_BITS_SHIFT,
> opmode << MODE_BITS_SHIFT);
s/ret =/return/
> -out:
> return ret;
> }
>
> /* torch */
>
> -/* torch pin config for lm3642*/
> +/* torch pin config for lm3642 */
> static ssize_t lm3642_torch_pin_store(struct device *dev,
> struct device_attribute *attr,
> const char *buf, size_t size)
> @@ -182,7 +181,7 @@ static ssize_t lm3642_torch_pin_store(struct device *dev,
>
> ret = kstrtouint(buf, 10, &state);
> if (ret)
> - goto out_strtoint;
> + return ret;
> if (state != 0)
> state = 0x01 << TORCH_PIN_EN_SHIFT;
>
> @@ -190,16 +189,12 @@ static ssize_t lm3642_torch_pin_store(struct device *dev,
> ret = regmap_update_bits(chip->regmap, REG_ENABLE,
> TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
> state);
> - if (ret < 0)
> - goto out;
> + if (ret < 0) {
> + dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
> + return ret;
> + }
>
> return size;
> -out:
> - dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
> - return ret;
> -out_strtoint:
> - dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
> - return ret;
> }
>
> static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);
> @@ -233,7 +228,7 @@ static ssize_t lm3642_strobe_pin_store(struct device *dev,
>
> ret = kstrtouint(buf, 10, &state);
> if (ret)
> - goto out_strtoint;
> + return ret;
> if (state != 0)
> state = 0x01 << STROBE_PIN_EN_SHIFT;
>
> @@ -241,16 +236,12 @@ static ssize_t lm3642_strobe_pin_store(struct device *dev,
> ret = regmap_update_bits(chip->regmap, REG_ENABLE,
> STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
> state);
> - if (ret < 0)
> - goto out;
> + if (ret < 0) {
> + dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
> + return ret;
> + }
>
> return size;
> -out:
> - dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
> - return ret;
> -out_strtoint:
> - dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
> - return ret;
> }
>
> static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);
>
While we are at it I'd also switch to device managed LED registration
API.
--
Best regards,
Jacek Anaszewski
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