linux-kernel - Re: [PATCH v2 2/3] ASoC: sh: rz-ssi: Propagate error codes returned from platform_get_irq

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Date:   Tue, 26 Apr 2022 10:55:23 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Sergey Shtylyov <s.shtylyov@....ru>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        alsa-devel <alsa-devel@...a-project.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Pavel Machek <pavel@...x.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 2/3] ASoC: sh: rz-ssi: Propagate error codes returned
 from platform_get_irq_byname()

Hi Sergey,

Thank you for the review.

On Tue, Apr 26, 2022 at 10:47 AM Sergey Shtylyov <s.shtylyov@....ru> wrote:
>
> Hello!
>
> On 4/26/22 10:49 AM, Lad Prabhakar wrote:
>
> > Propagate error codes returned from platform_get_irq_byname() instead of
> > returning -ENODEV. platform_get_irq_byname() may return -EPROBE_DEFER, to
> > handle such cases propagate the error codes.
> >
> > While at it drop the dev_err_probe() messages as platform_get_irq_byname()
> > already does this for us in case of error.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > v1->v2
> > * No change
> > ---
> >  sound/soc/sh/rz-ssi.c | 9 +++------
> >  1 file changed, 3 insertions(+), 6 deletions(-)
> >
> > diff --git a/sound/soc/sh/rz-ssi.c b/sound/soc/sh/rz-ssi.c
> > index cec458b8c507..d9a684e71ec3 100644
> > --- a/sound/soc/sh/rz-ssi.c
> > +++ b/sound/soc/sh/rz-ssi.c
> > @@ -977,8 +977,7 @@ static int rz_ssi_probe(struct platform_device *pdev)
> >       /* Error Interrupt */
> >       ssi->irq_int = platform_get_irq_byname(pdev, "int_req");
> >       if (ssi->irq_int < 0)
> > -             return dev_err_probe(&pdev->dev, -ENODEV,
> > -                                  "Unable to get SSI int_req IRQ\n");
> > +             return ssi->irq_int;
>
>    Why not:
>
>                 return dev_err_probe(&pdev->dev, ssi->irq_int,
>                                      "Unable to get SSI int_req IRQ\n");
>
That is because platform_get_irq_byname() already does this for us [0]
(also mentioned in the commit message). In case I keep the
dev_err_probe() I'll get two prints for each error.

[0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/base/platform.c?h=v5.18-rc4#n471

Cheers,
Prabhakar

> [...]
> > @@ -990,8 +989,7 @@ static int rz_ssi_probe(struct platform_device *pdev)
> >               /* Tx and Rx interrupts (pio only) */
> >               ssi->irq_tx = platform_get_irq_byname(pdev, "dma_tx");
> >               if (ssi->irq_tx < 0)
> > -                     return dev_err_probe(&pdev->dev, -ENODEV,
> > -                                          "Unable to get SSI dma_tx IRQ\n");
> > +                     return ssi->irq_tx;
>
>    Same here...
>
> >
> >               ret = devm_request_irq(&pdev->dev, ssi->irq_tx,
> >                                      &rz_ssi_interrupt, 0,
> > @@ -1002,8 +1000,7 @@ static int rz_ssi_probe(struct platform_device *pdev)
> >
> >               ssi->irq_rx = platform_get_irq_byname(pdev, "dma_rx");
> >               if (ssi->irq_rx < 0)
> > -                     return dev_err_probe(&pdev->dev, -ENODEV,
> > -                                          "Unable to get SSI dma_rx IRQ\n");
> > +                     return ssi->irq_rx;
>
>    And here...
>
> [...]
>
> MBR, Sergey