Atomicity in KMS panic notifier

Takashi Iwai tiwai at
Mon May 5 08:04:57 PDT 2014

At Mon, 5 May 2014 16:52:45 +0200,
Daniel Vetter wrote:
> On Mon, May 5, 2014 at 4:48 PM, Takashi Iwai <tiwai at> wrote:
> >
> > The current problem I see is that the rest of panic notifier chain
> > won't be called once when we hit the problem in KMS notifier.  So,
> > this bug in KMS influences on the rest panic behavior.
> >
> > Maybe a hackish solution would be to keep KMS notifier at the end of
> > notifier chain so that it crashes at last.  I don't like this either,
> > but...
> You need to do that with both the kms panic notifier in
> drm_fb_helper.c and with the fbcon panic notifier. And iirc there's
> also a console->unblank call somewhere which _also_ can end up in
> ->set_par. But I'm not sure anymore when exactly that one is run, I've
> tried hard to forget this all ;-)

Oh well, you're suggesting the need for Propranolol overdose ;)


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