linux-kernel - Re: [PATCH v2] video: backlight: Make use of the helper function dev_err

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Message-ID: <20210917131529.3oc7xeb4xpvgq5og@maple.lan>
Date:   Fri, 17 Sep 2021 14:15:29 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Cai Huoqing <caihuoqing@...du.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] video: backlight: Make use of the helper function
 dev_err_probe()

On Fri, Sep 17, 2021 at 08:53:23PM +0800, Cai Huoqing wrote:
> When possible use dev_err_probe help to properly deal with the
> PROBE_DEFER error, the benefit is that DEFER issue will be logged
> in the devices_deferred debugfs file.
> Using dev_err_probe() can reduce code size, and the error value
> gets printed.
> 
> Signed-off-by: Cai Huoqing <caihuoqing@...du.com>
> ---
> v1->v2: backlight patches are handled in one

This appears to leave a lot of backlight drivers with the same code
pattern that are not updated. As my last e-mail, please can you explain
why you selected these drivers and no others?

I would expect this type of change to be made with the assistance of a
script to automatically help you identify and change the code patterns
you are targetting. This would allow you to update all the backlight
drivers at once.


Daniel.


>  drivers/video/backlight/bd6107.c      | 16 +++++--------
>  drivers/video/backlight/l4f00242t03.c | 34 ++++++++++-----------------
>  2 files changed, 19 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c
> index 515184fbe33a..e21b793302a2 100644
> --- a/drivers/video/backlight/bd6107.c
> +++ b/drivers/video/backlight/bd6107.c
> @@ -120,7 +120,6 @@ static int bd6107_probe(struct i2c_client *client,
>  	struct backlight_device *backlight;
>  	struct backlight_properties props;
>  	struct bd6107 *bd;
> -	int ret;
>  
>  	if (pdata == NULL) {
>  		dev_err(&client->dev, "No platform data\n");
> @@ -148,11 +147,9 @@ static int bd6107_probe(struct i2c_client *client,
>  	 * the reset.
>  	 */
>  	bd->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
> -	if (IS_ERR(bd->reset)) {
> -		dev_err(&client->dev, "unable to request reset GPIO\n");
> -		ret = PTR_ERR(bd->reset);
> -		return ret;
> -	}
> +	if (IS_ERR(bd->reset))
> +		return dev_err_probe(&client->dev, PTR_ERR(bd->reset),
> +				     "unable to request reset GPIO\n");
>  
>  	memset(&props, 0, sizeof(props));
>  	props.type = BACKLIGHT_RAW;
> @@ -164,10 +161,9 @@ static int bd6107_probe(struct i2c_client *client,
>  					      dev_name(&client->dev),
>  					      &bd->client->dev, bd,
>  					      &bd6107_backlight_ops, &props);
> -	if (IS_ERR(backlight)) {
> -		dev_err(&client->dev, "failed to register backlight\n");
> -		return PTR_ERR(backlight);
> -	}
> +	if (IS_ERR(backlight))
> +		return dev_err_probe(&client->dev, PTR_ERR(backlight),
> +				     "failed to register backlight\n");
>  
>  	backlight_update_status(backlight);
>  	i2c_set_clientdata(client, backlight);
> diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c
> index 46f97d1c3d21..8d81d4dec3c6 100644
> --- a/drivers/video/backlight/l4f00242t03.c
> +++ b/drivers/video/backlight/l4f00242t03.c
> @@ -179,37 +179,29 @@ static int l4f00242t03_probe(struct spi_device *spi)
>  	priv->spi = spi;
>  
>  	priv->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
> -	if (IS_ERR(priv->reset)) {
> -		dev_err(&spi->dev,
> -			"Unable to get the lcd l4f00242t03 reset gpio.\n");
> -		return PTR_ERR(priv->reset);
> -	}
> +	if (IS_ERR(priv->reset))
> +		return dev_err_probe(&spi->dev, PTR_ERR(priv->reset),
> +				     "Unable to get the lcd l4f00242t03 reset gpio.\n");
>  	gpiod_set_consumer_name(priv->reset, "lcd l4f00242t03 reset");
>  
>  	priv->enable = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
> -	if (IS_ERR(priv->enable)) {
> -		dev_err(&spi->dev,
> -			"Unable to get the lcd l4f00242t03 data en gpio.\n");
> -		return PTR_ERR(priv->enable);
> -	}
> +	if (IS_ERR(priv->enable))
> +		return dev_err_probe(&spi->dev, PTR_ERR(priv->enable),
> +				     "Unable to get the lcd l4f00242t03 data en gpio.\n");
>  	gpiod_set_consumer_name(priv->enable, "lcd l4f00242t03 data enable");
>  
>  	priv->io_reg = devm_regulator_get(&spi->dev, "vdd");
> -	if (IS_ERR(priv->io_reg)) {
> -		dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
> -		       __func__);
> -		return PTR_ERR(priv->io_reg);
> -	}
> +	if (IS_ERR(priv->io_reg))
> +		return dev_err_probe(&spi->dev, PTR_ERR(priv->io_reg),
> +				     "%s: Unable to get the IO regulator\n", __func__);
>  
>  	priv->core_reg = devm_regulator_get(&spi->dev, "vcore");
> -	if (IS_ERR(priv->core_reg)) {
> -		dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
> -		       __func__);
> -		return PTR_ERR(priv->core_reg);
> -	}
> +	if (IS_ERR(priv->core_reg))
> +		return dev_err_probe(&spi->dev, PTR_ERR(priv->core_reg),
> +				     "%s: Unable to get the core regulator\n", __func__);
>  
>  	priv->ld = devm_lcd_device_register(&spi->dev, "l4f00242t03", &spi->dev,
> -					priv, &l4f_ops);
> +					    priv, &l4f_ops);
>  	if (IS_ERR(priv->ld))
>  		return PTR_ERR(priv->ld);
>  
> -- 
> 2.25.1
>