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Date: Wed, 22 Nov 2017 15:22:43 +0530 From: "Mukunda,Vijendar" <vijendar.mukunda@....com> To: "Deucher, Alexander" <Alexander.Deucher@....com>, "Agrawal, Akshu" <Akshu.Agrawal@....com>, 'Guenter Roeck' <linux@...ck-us.net>, Liam Girdwood <lgirdwood@...il.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 On Tuesday 21 November 2017 08:38 PM, Deucher, Alexander wrote: >> -----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 > on top of this patch will add more error checks and submit a new patch >>> 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
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