linux-kernel - Re: [PATCH 1/2] backlight: bd6107: Make use of the helper function dev_err

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Message-ID: <20210917110528.GA17963@LAPTOP-UKSR4ENP.internal.baidu.com>
Date:   Fri, 17 Sep 2021 19:05:28 +0800
From:   Cai Huoqing <caihuoqing@...du.com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
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 1/2] backlight: bd6107: Make use of the helper function
 dev_err_probe()

Hi
Thanks for your feedback.
On 17 9月 21 10:17:29, Daniel Thompson wrote:
> 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@...du.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).
Only two related patches for backlight.
I try to keep one patch for a subdriver, sometimes different
subdriver owner need to mark reviwed independently.

Thanks,
Cai
> 
> 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
> >