[Intel-gfx] [PATCH] drm/i915: Do not attempt to re-enable an unconnected primary plane

[Daniel Vetter]

On Wed, Nov 27, 2013 at 12:01:32PM +0000, Chris Wilson wrote:
> Due to user fudging (for instance using video=VGA-1:e with FBDEV=n) we can
> attempt to reset an inconsistent CRTC that is marked as active but has
> no assigned fb. It would be wise to fix this earlier, but the long
> term plan is to have primary and secondary planes associated with a
> CRTC, in which crtc->fb being NULL will be expected. So for a quick
> short term fix with pretensions of grandeur, just check for a NULL fb
> during GPU reset and ignore the plane restoration.
> 
> This fixes a potential hard hang (a panic in the panic handler)
> following a GPU hang.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>

Queued for -next (with a small fixme code comment added), thanks for the
patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch