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| /openbmc/linux/drivers/gpu/drm/i915/ |
| H A D | i915_irq.c | diff 9adab8b5a7fde248504f484e197589f3e3c922e2 Wed May 09 15:45:43 CDT 2012 Chris Wilson <chris@chris-wilson.co.uk> drm/i915: Avoid a double-read of PCH_IIR during interrupt handling
Currently the code re-reads PCH_IIR during the hotplug interrupt
processing. Not only is this a wasted read, but introduces a potential
for handling a spurious interrupt as we then may not clear all the
interrupts processed (since the re-read IIR may contains more interrupts
asserted than we clear using the result of the original read).
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: stable@kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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