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 13:17:18 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
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()

On 4/26/22 12:55 PM, 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

   Ah! Sorry, didn't read your commit log... :-/
   More shame on me as it was me who added dev_err_probe() call there! :-) 

> Cheers,
> Prabhakar

[...]

MBR, Sergey