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<body><span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [GM45] Xorg freezes when using gnome shell: kernel BUG at drivers/gpu/drm/drm_irq.c:929!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=57945">bug 57945</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [GM45] Xorg freezes when using gnome shell: kernel BUG at drivers/gpu/drm/drm_irq.c:929!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=57945#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [GM45] Xorg freezes when using gnome shell: kernel BUG at drivers/gpu/drm/drm_irq.c:929!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=57945">bug 57945</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>Should be fixed in drm-intel-fixes:
commit e7d841ca03b7ab668620045cd7b428eda9f41601
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Mon Dec 3 11:36:30 2012 +0000
drm/i915: Close race between processing unpin task and queueing the flip
Before queuing the flip but crucially after attaching the unpin-work to
the crtc, we continue to setup the unpin-work. However, should the
hardware fire early, we see the connected unpin-work and queue the task.
The task then promptly runs and unpins the fb before we finish taking
the required references or even pinning it... Havoc.
To close the race, we use the flip-pending atomic to indicate when the
flip is finally setup and enqueued. So during the flip-done processing,
we can check more accurately whether the flip was expected.
v2: Add the appropriate mb() to ensure that the writes to the page-flip
worker are complete prior to marking it active and emitting the MI_FLIP.
On the read side, the mb should be enforced by the spinlocks.</pre>
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