linux-kernel - Re: [PATCH v2] iio: adc: stm32: Simplify with dev_err

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Date:   Thu, 27 Aug 2020 21:06:52 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Fabrice Gasnier <fabrice.gasnier@...com>,
        Etienne Carriere <etienne.carriere@...com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        linux-iio <linux-iio@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] iio: adc: stm32: Simplify with dev_err_probe()

On Thu, Aug 27, 2020 at 11:27:12AM +0300, Andy Shevchenko wrote:
> On Wed, Aug 26, 2020 at 7:19 PM Krzysztof Kozlowski <krzk@...nel.org> wrote:
> >
> > Common pattern of handling deferred probe can be simplified with
> > dev_err_probe().  Less code and also it prints the error value.
> 
> 
> 
> 
> 
> 
> >         priv->aclk = devm_clk_get(&pdev->dev, "adc");
> >         if (IS_ERR(priv->aclk)) {
> >                 ret = PTR_ERR(priv->aclk);
> > -               if (ret != -ENOENT) {
> > -                       if (ret != -EPROBE_DEFER)
> > -                               dev_err(&pdev->dev, "Can't get 'adc' clock\n");
> > -                       return ret;
> > -               }
> > +               if (ret != -ENOENT)
> > +                       return dev_err_probe(&pdev->dev, ret, "Can't get 'adc' clock\n");
> > +
> >                 priv->aclk = NULL;
> >         }
> >
> >         priv->bclk = devm_clk_get(&pdev->dev, "bus");
> >         if (IS_ERR(priv->bclk)) {
> >                 ret = PTR_ERR(priv->bclk);
> > -               if (ret != -ENOENT) {
> > -                       if (ret != -EPROBE_DEFER)
> > -                               dev_err(&pdev->dev, "Can't get 'bus' clock\n");
> > -                       return ret;
> > -               }
> > +               if (ret != -ENOENT)
> > +                       return dev_err_probe(&pdev->dev, ret, "Can't get 'bus' clock\n");
> > +
> >                 priv->bclk = NULL;
> >         }
> 
> Again, devm_clk_get_optional() and even, if it exists,
> devm_clk_bulk_get_optional().

Sure.

> 
> Please, revisit all patches on this topic.

I'll check them.


Best regards,
Krzysztof