linux-kernel - Re: 5.15 Linux Regression in sound hda

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Date:   Wed, 10 Nov 2021 10:53:53 -0800
From:   Scott Branden <scott.branden@...adcom.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     perex@...ex.cz, tiwai@...e.com, ranjani.sridharan@...ux.intel.com,
        broonie@...nel.org, kai.vehmanen@...ux.intel.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        regressions@...mhuis.info
Subject: Re: 5.15 Linux Regression in sound hda

Hi Takashi,

On 2021-11-10 6:33 a.m., Takashi Iwai wrote:
> On Tue, 09 Nov 2021 22:12:30 +0100,
> Scott Branden wrote:
>>
>> I'm reporting a new WARN_ON in sound/hda/hdac_bus.c that was not
>> present in 5.15.  Sorry, I don't have time to bisect this right now
>> but report is below.
>>
>> dmesg in 5.14 kernel was:
>> snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops 0xffffffffaa2ac520)
>> GACT probability on
>> Mirror/redirect action on
>> Simple TC action Loaded
>> u32 classifier
>>      Performance counters on
>>      input device check on
>>      Actions configured
>> hdaudio hdaudioC0D0: Unable to bind the codec
>> hdaudio hdaudioC0D2: Unable to bind the codec
>>
>> dmesg in 5.15 kernel produces WARN_ON in sound/hda/hdac_bus.c
>> snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops 0xffffffffad8b02a0)
>> GACT probability on
>> Mirror/redirect action on
>> Simple TC action Loaded
>> u32 classifier
>>      Performance counters on
>>      input device check on
>>      Actions configured
>> snd_hda_intel 0000:00:1f.3: Cannot probe codecs, giving up
>> Initializing XFRM netlink socket
>> ------------[ cut here ]------------
>> NET: Registered PF_INET6 protocol family
>> WARNING: CPU: 14 PID: 186 at sound/hda/hdac_bus.c:73
> 
> This indicates the leftover codecs on the bus, and it's likely
> triggered by the recent change to allow retrying the codec probes.
> 
> Did this HD-audio stuff work at all before 5.15?  The codec bind error
> itself shouldn't be brought by that change.
I don't know if HD-audio works at all on this system - we don't test 
HD-audio but parse the dmesg for issues so detected this new one.

> 
> The warning itself can be solved by the patch below, I suppose
> (note: totally untested!)

I tested your patch below and can confirm the WARN_ON is not produced on 
boot.

> 
> 
> thanks,
> 
> Takashi
> 
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -2327,7 +2327,8 @@ static int azx_probe_continue(struct azx *chip)
>   
>   out_free:
>   	if (err < 0) {
> -		azx_free(chip);
> +		pci_set_drvdata(pci, NULL);
> +		snd_card_free(chip->card);
>   		return err;
>   	}
>   
> 
Regards,
  Scott

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