linux-kernel - Re: [PATCH] regulator: pwm-regulator: Make use of the helper function dev_err

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Date:   Mon, 20 Sep 2021 23:35:18 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic@...ts.infradead.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jon Hunter <jonathanh@...dia.com>
Subject: Re: [PATCH] regulator: pwm-regulator: Make use of the helper function dev_err_probe()

Hi Neil,

On Mon, 20 Sept 2021 at 13:56, Neil Armstrong <narmstrong@...libre.com> wrote:
>
> On 19/09/2021 23:11, Anand Moon wrote:
> > devm_regulator_register can return -EPROBE_DEFER if the
> > regulator is not ready yet. Use dev_err_probe() for
> > pwm regulator resources to indicate the deferral reason
> > when waiting for the resource to come up.
> >
> > Fixes: 0cd71b9a43ad ("regulator: pwm: Don't warn on probe deferral")
> >
> > Cc: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > ---
> >  drivers/regulator/pwm-regulator.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
> > index 7629476d94ae..451e57a739f8 100644
> > --- a/drivers/regulator/pwm-regulator.c
> > +++ b/drivers/regulator/pwm-regulator.c
> > @@ -382,9 +382,9 @@ static int pwm_regulator_probe(struct platform_device *pdev)
> >                                           &drvdata->desc, &config);
> >       if (IS_ERR(regulator)) {
> >               ret = PTR_ERR(regulator);
> > -             dev_err(&pdev->dev, "Failed to register regulator %s: %d\n",
> > -                     drvdata->desc.name, ret);
> > -             return ret;
> > +             return dev_err_probe(&pdev->dev, ret,
> > +                                  "Failed to register regulator %s: %d\n",
> > +                                  drvdata->desc.name, ret);
>
> No need to keep ret and print it since it will be printed by dev_err_probe, pass directly PTR_ERR(regulator) and drop the ": %d" from the error string.
>
> Neil
>

Thanks for the input but it's a wrong fix I meant to fix another probe
defer with *devm_pwm_get*
I will correct this in the next version..

Thanks
-Anand

>
> >       }
> >
> >       return 0;
> >
>