Re: 5.15 Linux Regression in sound hda

[Takashi Iwai <tiwai@suse.de>]

On Wed, 10 Nov 2021 19:53:53 +0100,
Scott Branden wrote:
> 
> 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.

OK.

> > 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.

Good, then I'll submit and merge the proper patch.


Thanks!

Takashi