Atomicity in KMS panic notifier

Daniel Vetter daniel at
Mon May 5 07:52:45 PDT 2014

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 ;-)
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 -

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