[PATCH 6/9] ALSA: hda: Fix page fault in snd_hda_codec_shutdown()

[Cezary Rojewski]

On 2022-07-15 8:23 PM, Takashi Iwai wrote:
> On Fri, 15 Jul 2022 20:16:14 +0200,
> Pierre-Louis Bossart wrote:

...

>> This patch causes an across-the-board regression on all SOF platforms
>> using an HDaudio or iDISP codec. Only 'nocodec' platforms are
>> unaffected, see results at
>> https://sof-ci.01.org/linuxpr/PR3763/build394/devicetest/
>>
>> Reverting this commit seems to fix the issue.
>>
>> Upstream merge:
>> https://github.com/thesofproject/linux/pull/3763
>>
>> Issue and bisect results
>> https://github.com/thesofproject/linux/issues/3764
>>
>> I don't know what this was supposed to fix on the shutdown path but it's
>> clearly having side effects on the probe/init path.
> 
> Yeah, obviously the patch ignores the fact that hdac_hda does
> initialize the HD-audio codec without snd_hda_codec_device_init().
> 
> I'm going to revert the commit.


Thanks for the report and sorry the trouble.

This patch is still valid - will re-check hdac_hda.c and update it so 
that both the regression and the page fault are gone.


Regards,
Czarek