Re: [PATCH] ASoC: rt5682: Fix panic in rt5682_jack_detect_handler happening during system shutdown

[Ranjani Sridharan <ranjani.sridharan@linux.intel.com>]

On Thu, 2021-02-04 at 18:41 +0100, Takashi Iwai wrote:
> On Thu, 04 Feb 2021 18:27:24 +0100,
> Ranjani Sridharan wrote:
> > From: Sathyanarayana Nujella <sathyanarayana.nujella@intel.com>
> > 
> > During Coldboot stress tests, system encountered the following
> > panic.
> > Panic logs depicts rt5682_i2c_shutdown() happened first and then
> > later
> > jack detect handler workqueue function triggered.
> > This situation causes panic as rt5682_i2c_shutdown() resets codec.
> > Fix this panic by cancelling properly delayed work.
> > 
> > Panic log:
> > [   20.936124] sof_pci_shutdown
> > [   20.940248] snd_sof_device_shutdown
> > [   20.945023] snd_sof_shutdown
> > [   21.126849] rt5682_i2c_shutdown
> > [   21.286053] rt5682_jack_detect_handler
> > [   21.291235] BUG: kernel NULL pointer dereference, address:
> > 000000000000037c
> > [   21.299302] #PF: supervisor read access in kernel mode
> > [   21.305254] #PF: error_code(0x0000) - not-present page
> > [   21.311218] PGD 0 P4D 0
> > [   21.314155] Oops: 0000 [#1] PREEMPT SMP NOPTI
> > [   21.319206] CPU: 2 PID: 123 Comm: kworker/2:3 Tainted:
> > G     U            5.4.68 #10
> > [   21.333687] ACPI: Preparing to enter system sleep state S5
> > [   21.337669] Workqueue: events_power_efficient
> > rt5682_jack_detect_handler [snd_soc_rt5682]
> > [   21.337671] RIP: 0010:rt5682_jack_detect_handler+0x6c/0x279
> > [snd_soc_rt5682]
> > 
> > Fixes: a50067d4f3c1d ('ASoC: rt5682: split i2c driver into separate
> > module')
> > Signed-off-by: Jairaj Arava <jairaj.arava@intel.com>
> > Signed-off-by: Sathyanarayana Nujella <
> > sathyanarayana.nujella@intel.com>
> > Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
> > Reviewed-by: Shuming Fan <shumingf@realtek.com>
> > Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com
> > >
> > ---
> >  sound/soc/codecs/rt5682-i2c.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/sound/soc/codecs/rt5682-i2c.c
> > b/sound/soc/codecs/rt5682-i2c.c
> > index 37d13120f5ba..6effd2611e3c 100644
> > --- a/sound/soc/codecs/rt5682-i2c.c
> > +++ b/sound/soc/codecs/rt5682-i2c.c
> > @@ -273,6 +273,8 @@ static void rt5682_i2c_shutdown(struct
> > i2c_client *client)
> >  {
> >  	struct rt5682_priv *rt5682 = i2c_get_clientdata(client);
> >  
> > +	cancel_delayed_work_sync(&rt5682->jack_detect_work);
> > +
> >  	rt5682_reset(rt5682);
> >  }
> 
> The driver has two works.  Doesn't another one need Canceling?
> 
> Just to be sure...
Good point, it looks like maybe we need to cancel &rt5682-
>jd_check_work as well.

Thanks,Ranjani
> 
> thanks,
> 
> Takashi