linux-kernel - Re: [PATCH v2 2/2] iio: st_lsm9ds0: Make use of the helper function dev_err

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Date:   Thu, 7 Oct 2021 18:30:52 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Cai Huoqing <caihuoqing@...du.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>, <linux-iio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v2 2/2] iio: st_lsm9ds0: Make use of the helper function
 dev_err_probe()

On Wed, 29 Sep 2021 18:06:38 +0100
Jonathan Cameron <jic23@...nel.org> wrote:

> On Tue, 28 Sep 2021 09:40:54 +0800
> Cai Huoqing <caihuoqing@...du.com> 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>  

+CC Andy who wrote this particular driver.

Change looks simple enough I'll apply it though and at least get 0-day building it.

Applied to the togreg branch of iio.git and pushed out as testing for 0-day to
work it's magic,

Thanks,

Jonathan


> 
> Hi Cai,
> 
> Picking a random patch to reply to...
> 
> Thanks for your hard work on these.  The ones I haven't replied to look
> fine to me.   It might have been slightly better to slow down your initial
> submission of these as then we could perhaps have avoided 2-3 versions
> of every patch by identifying shared elements to improve in a smaller set.
> Still that's the benefit of hindsight!
> 
> I'll not apply these quite yet so as to allow time for driver maintainers
> and others to take a look.
> 
> If you could tidy up those few minor comments I have that would be great.
> 
> Thanks,
> 
> Jonathan
> 
> > ---
> >  drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c | 12 ++++++------
> >  1 file changed, 6 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c b/drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c
> > index b3a43a3b04ff..9fb06b7cde3c 100644
> > --- a/drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c
> > +++ b/drivers/iio/imu/st_lsm9ds0/st_lsm9ds0_core.c
> > @@ -24,10 +24,10 @@ static int st_lsm9ds0_power_enable(struct device *dev, struct st_lsm9ds0 *lsm9ds
> >  
> >  	/* Regulators not mandatory, but if requested we should enable them. */
> >  	lsm9ds0->vdd = devm_regulator_get(dev, "vdd");
> > -	if (IS_ERR(lsm9ds0->vdd)) {
> > -		dev_err(dev, "unable to get Vdd supply\n");
> > -		return PTR_ERR(lsm9ds0->vdd);
> > -	}
> > +	if (IS_ERR(lsm9ds0->vdd))
> > +		return dev_err_probe(dev, PTR_ERR(lsm9ds0->vdd),
> > +				     "unable to get Vdd supply\n");
> > +
> >  	ret = regulator_enable(lsm9ds0->vdd);
> >  	if (ret) {
> >  		dev_warn(dev, "Failed to enable specified Vdd supply\n");
> > @@ -36,9 +36,9 @@ static int st_lsm9ds0_power_enable(struct device *dev, struct st_lsm9ds0 *lsm9ds
> >  
> >  	lsm9ds0->vdd_io = devm_regulator_get(dev, "vddio");
> >  	if (IS_ERR(lsm9ds0->vdd_io)) {
> > -		dev_err(dev, "unable to get Vdd_IO supply\n");
> >  		regulator_disable(lsm9ds0->vdd);
> > -		return PTR_ERR(lsm9ds0->vdd_io);
> > +		return dev_err_probe(dev, PTR_ERR(lsm9ds0->vdd_io),
> > +				     "unable to get Vdd_IO supply\n");
> >  	}
> >  	ret = regulator_enable(lsm9ds0->vdd_io);
> >  	if (ret) {  
>