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author | Ramalingam C <ramalingam.c@intel.com> | 2015-03-03 12:11:46 +0530 |
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committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-03-17 22:29:55 +0100 |
commit | 3954e733ab0c9449443897f2669e17fff4471a0e (patch) | |
tree | 6f8906ace38a1d3843e3cbbd1d9216a9f2a18113 /drivers/parport | |
parent | a54746e39ad5cc27cf3099bec1e813cdf8ad7f7e (diff) |
drm/i915: Fixing mutex deadlock window at eDP DRRS
In invalidate and flush functions of eDP DRRS, if deferred downclock
work starts execution at a time window between acquiring the drrs
mutex and cancellation of the deferred work
(intel_edp_drrs_downclock_work), then deferred work will find
drrs mutex locked and wait for the same.
Meanwhile the function that acquired mutex drrs invalidate/flush will
wait for the completion of the deferred work before releasing the mutex.
Thats a deadlock.
To avoid such deadlock scenario, this change cancels the deferred work
before acquiring the mutex at invalidate and flush functions.
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/parport')
0 files changed, 0 insertions, 0 deletions