linux-kernel - Re: [PATCH -next] ASoC: sun4i-codec: Fix error return code in sun4i_codec

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Date:   Mon, 22 Aug 2016 07:54:50 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Wei Yongjun <weiyj.lk@...il.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Emilio Lopez <emilio@...pez.com.ar>,
        Hans De Goede <hdegoede@...hat.com>, ats@...og.org,
        fengguang.wu@...el.com, Linux-ALSA <alsa-devel@...a-project.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] ASoC: sun4i-codec: Fix error return code in
 sun4i_codec_probe()

Hi,

On Thu, Aug 11, 2016 at 10:15:27PM +0800, Wei Yongjun wrote:
> Hi
> 
> On 08/10/2016 10:04 PM, Chen-Yu Tsai wrote:
> > On Wed, Aug 10, 2016 at 9:42 PM, Wei Yongjun <weiyj.lk@...il.com> wrote:
> >> Fix to return error code -ENOMEM instead of 0 when create card
> >> failed, as done elsewhere in this function.
> >>
> >> Fixes: 45fb6b6f2aa3 ("ASoC: sunxi: add support for the on-chip
> >> codec on early Allwinner SoCs")
> >> Signed-off-by: Wei Yongjun <weiyj.lk@...il.com>
> >> ---
> >>  sound/soc/sunxi/sun4i-codec.c | 1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> diff --git a/sound/soc/sunxi/sun4i-codec.c b/sound/soc/sunxi/sun4i-codec.c
> >> index 0e19c50..e741659 100644
> >> --- a/sound/soc/sunxi/sun4i-codec.c
> >> +++ b/sound/soc/sunxi/sun4i-codec.c
> >> @@ -846,6 +846,7 @@ static int sun4i_codec_probe(struct platform_device *pdev)
> >>         card = sun4i_codec_create_card(&pdev->dev);
> >>         if (!card) {
> >>                 dev_err(&pdev->dev, "Failed to create our card\n");
> >> +               ret = -ENOMEM;
> >>                 goto err_unregister_codec;
> >>         }
> >>
> > This works, though it might be better to fix the create_card function and
> > any custom functions called in there to pass back a proper error value.
> >
> Since sun4i_codec_create_card() can only failed when kmalloc() return NULL, so
> still need to change sun4i_codec_create_card()?

Yes, please do. It's better to return whatever the function was
returning. That was, if we add a new error code, we don't have to
rework the code over and over again.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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