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Date:   Fri, 17 Sep 2021 10:17:29 +0100
From:   Daniel Thompson <daniel.thompson@linaro.org>
To:     Cai Huoqing <caihuoqing@baidu.com>
Cc:     Lee Jones <lee.jones@linaro.org>,
        Jingoo Han <jingoohan1@gmail.com>,
        dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] backlight: bd6107: Make use of the helper function
 dev_err_probe()
Message-ID: <20210917091729.elpngrzpvmp43wns@maple.lan>
References: <20210917031308.17623-1-caihuoqing@baidu.com>
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In-Reply-To: <20210917031308.17623-1-caihuoqing@baidu.com>
Precedence: bulk

On Fri, Sep 17, 2021 at 11:13:06AM +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@baidu.com>

Change seems OK but does this really need to be done one file at a time?
I'd prefer to see all of backlight handled in one go (given the scope of
this change if applied across the kernel it needs automatic tooling
anyway).


Daniel.


> ---
>  drivers/video/backlight/bd6107.c | 16 ++++++----------
>  1 file changed, 6 insertions(+), 10 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);
> -- 
> 2.25.1
>