linux-kernel - Re: [PATCH v2 10/12] ASoC: SOF: Intel: hda: make sure DAI widget is set up before IPC

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Message-ID: <1ab40375-57fd-a3c6-68d7-9db78a20ed6e@linux.intel.com>
Date:   Mon, 27 Sep 2021 12:09:20 +0300
From:   Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To:     Daniel Baluta <daniel.baluta@...il.com>
Cc:     Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Daniel Baluta <daniel.baluta@....nxp.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>
Subject: Re: [PATCH v2 10/12] ASoC: SOF: Intel: hda: make sure DAI widget is
 set up before IPC

Hi Daniel,

On 24/09/2021 10:42, Daniel Baluta wrote:
> On Thu, Sep 23, 2021 at 4:04 PM Péter Ujfalusi
> <peter.ujfalusi@...ux.intel.com> wrote:
>>
>>
>>
>> On 23/09/2021 15:58, Pierre-Louis Bossart wrote:
>>>
>>>>> +static struct sof_ipc_dai_config *hda_dai_update_config(struct snd_soc_dapm_widget *w,
>>>>> +                                                   int channel)
>>>>>  {
>>>>> +   struct snd_sof_widget *swidget = w->dobj.private;
>>>>>     struct sof_ipc_dai_config *config;
>>>>>     struct snd_sof_dai *sof_dai;
>>>>> -   struct sof_ipc_reply reply;
>>>>> -   int ret = 0;
>>>>>
>>>>> -   list_for_each_entry(sof_dai, &hda_stream->sdev->dai_list, list) {
>>>>> -           if (!sof_dai->cpu_dai_name)
>>>>> -                   continue;
>>>>> +   if (!swidget) {
>>>>> +           dev_err(swidget->scomp->dev, "error: No private data for widget %s\n", w->name);
>>>>
>>>> NULL pointer dereference, just return NULL without the print. The caller
>>>> is printing anyways.
>>>
>>> yes good catch, we need a v3 with the fixes suggested by Peter in
>>> https://github.com/thesofproject/linux/pull/3171/ applied.
>>
>> Only the second patch in the PR is applicable for upstream, but it
>> should be squashed in for v3.
> 
> Thanks Peter, will squash this in and send v3.

As we discussed, I'll send the v3 with the fix.

Thanks for sending the initial versions upstream!

-- 
Péter