| commit | dde97656524d4381c6b1532ba7ddc80b06a3a9ef | |
| author | Chris Wilson <chris@chris-wilson.co.uk> | |
| Wed, 9 May 2012 20:45:43 +0000 (9 21:45 +0100) | ||
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | |
| Fri, 1 Jun 2012 07:15:50 +0000 (1 15:15 +0800) | ||
| tree | 5ffc3b21c95ef40a7d9dcc56678104ce99c656a2 | treesnapshot (tar.gz zip) |
| parent | c6fd0e9bb4b9d4189eb93609081e3281e3d985d6 | commitdiff |
drm/i915: Avoid a double-read of PCH_IIR during interrupt handling
commit 9adab8b5a7fde248504f484e197589f3e3c922e2 upstream.
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>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
commit 9adab8b5a7fde248504f484e197589f3e3c922e2 upstream.
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>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| drivers/gpu/drm/i915/i915_irq.c | diffblobblamehistory |