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

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Message-ID: <20210917123103.33oytfwhpcakdi2w@maple.lan>
Date:   Fri, 17 Sep 2021 13:31:03 +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 1/2] backlight: bd6107: Make use of the helper function
 dev_err_probe()

On Fri, Sep 17, 2021 at 07:05:28PM +0800, Cai Huoqing wrote:
> 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.

Can you explain how you reach this conclusion?

I only checked two drivers (the first two when you list the drivers
an alphabetic order) but both contain code that appears to match the
pattern you are targeting.


> I try to keep one patch for a subdriver, sometimes different
> subdriver owner need to mark reviwed independently.

For mechanical patches of this nature I don't think there is any need
for acks from individual backlight driver authors. Reviews are 100%
welcome but we would not hold a single patch back until all authors
have reviewed it.


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
> > >