drm/i915: Reorder semaphore deadlock check

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commit 4be173813e upstream.

If a semaphore is waiting on another ring, which in turn happens to be
waiting on the first ring, but that second semaphore has been signalled,
we will be able to kick the second ring and so can treat the first ring
as a valid WAIT and not as HUNG.

v2: Be paranoid and cap the potential recursion depth whilst visiting
the semaphore signallers. (Mika)

References: https://bugs.freedesktop.org/show_bug.cgi?id=54226
References: https://bugs.freedesktop.org/show_bug.cgi?id=75502
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Chris Wilson 2014-06-06 10:22:29 +01:00 • committed by Greg Kroah-Hartman

parent b9db6260f1

commit 844c3b7228

2 changed files with 15 additions and 5 deletions

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18

drivers/gpu/drm/i915/i915_irq.c

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2

drivers/gpu/drm/i915/intel_ringbuffer.h

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