linux-kernel - RE: [PATCH] ASoC: amd: Add error checking to probe function

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Date:   Tue, 21 Nov 2017 15:08:01 +0000
From:   "Deucher, Alexander" <Alexander.Deucher@....com>
To:     "Agrawal, Akshu" <Akshu.Agrawal@....com>,
        'Guenter Roeck' <linux@...ck-us.net>,
        Liam Girdwood <lgirdwood@...il.com>,
        "Mukunda, Vijendar" <Vijendar.Mukunda@....com>
CC:     Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
        "Takashi Iwai" <tiwai@...e.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dominik Behr <dbehr@...omium.org>,
        "Daniel Kurtz" <djkurtz@...omium.org>
Subject: RE: [PATCH] ASoC: amd: Add error checking to probe function

> -----Original Message-----
> From: Agrawal, Akshu
> Sent: Tuesday, November 21, 2017 1:15 AM
> To: Deucher, Alexander; 'Guenter Roeck'; Liam Girdwood; Mukunda,
> Vijendar
> Cc: Mark Brown; Jaroslav Kysela; Takashi Iwai; alsa-devel@...a-project.org;
> linux-kernel@...r.kernel.org; Dominik Behr; Daniel Kurtz
> Subject: Re: [PATCH] ASoC: amd: Add error checking to probe function
> 
> 
> 
> On 11/21/2017 10:17 AM, Deucher, Alexander wrote:
> >> -----Original Message-----
> >> From: Guenter Roeck [mailto:groeck7@...il.com] On Behalf Of Guenter
> >> Roeck
> >> Sent: Monday, November 20, 2017 11:28 PM
> >> To: Liam Girdwood
> >> Cc: Mark Brown; Jaroslav Kysela; Takashi Iwai; alsa-devel@...a-
> project.org;
> >> linux-kernel@...r.kernel.org; Guenter Roeck; Deucher, Alexander;
> Dominik
> >> Behr; Daniel Kurtz
> >> Subject: [PATCH] ASoC: amd: Add error checking to probe function
> >>
> >> The acp_audio_dma does not perform sufficient error checking in its
> probe
> >> function. This can result in crashes if a critical error path is
> >> encountered.
> >>
> >> Fixes: 7c31335a03b6a ("ASoC: AMD: add AMD ASoC ACP 2.x DMA driver")
> >> Cc: Alex Deucher <alexander.deucher@....com>
> >> Cc: Dominik Behr <dbehr@...omium.org>
> >> Cc: Daniel Kurtz <djkurtz@...omium.org>
> >> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> >> ---
> >> I didn't add an error check to acp_init() since I was not sure if
> >> its return value is ignored on purpose.
> >
> > Vijendar, Akshu can you comment?
> 
> This is also the case of missing error check.
> acp_init will return error if either sw reset did not happen or clock
> did not get enabled. In both cases we should error out in probe.
> 

Can you send out a patch to enable that error checking?

Thanks,

Alex

> >
> > The patch looks good to me.
> > Reviewed-by: Alex Deucher <alexander.deucher@....com>
> >
> >>
> >>   sound/soc/amd/acp-pcm-dma.c | 7 +++++++
> >>   1 file changed, 7 insertions(+)
> >>
> >> diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-
> >> dma.c
> >> index 9f521a55d610..b5e41df6bb3a 100644
> >> --- a/sound/soc/amd/acp-pcm-dma.c
> >> +++ b/sound/soc/amd/acp-pcm-dma.c
> >> @@ -1051,6 +1051,11 @@ static int acp_audio_probe(struct
> platform_device
> >> *pdev)
> >>   	struct resource *res;
> >>   	const u32 *pdata = pdev->dev.platform_data;
> >>
> >> +	if (!pdata) {
> >> +		dev_err(&pdev->dev, "Missing platform data\n");
> >> +		return -ENODEV;
> >> +	}
> >> +
> >>   	audio_drv_data = devm_kzalloc(&pdev->dev, sizeof(struct
> >> audio_drv_data),
> >>   					GFP_KERNEL);
> >>   	if (audio_drv_data == NULL)
> >> @@ -1058,6 +1063,8 @@ static int acp_audio_probe(struct
> platform_device
> >> *pdev)
> >>
> >>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >>   	audio_drv_data->acp_mmio = devm_ioremap_resource(&pdev-
> >>> dev, res);
> >> +	if (IS_ERR(audio_drv_data->acp_mmio))
> >> +		return PTR_ERR(audio_drv_data->acp_mmio);
> >>
> >>   	/* The following members gets populated in device 'open'
> >>   	 * function. Till then interrupts are disabled in 'acp_init'
> >> --
> >> 2.7.4
> >