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drm/i915: Drain the device workqueue on unload

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Workers on the i915->wq may rearm themselves so for completeness we need
to replace our flush_workqueue() with a call to drain_workqueue() before
unloading the device.

v2: Reinforce the drain_workqueue with an preceding rcu_barrier() as a
few of the tasks that need to be drained may first be armed by RCU.

References: https://bugs.freedesktop.org/show_bug.cgi?id=101627
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170718134124.14832-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
This commit is contained in:
Chris Wilson
2017-07-18 14:41:24 +01:00
parent 023f807989
commit 3b19f16a55
3 changed files with 23 additions and 5 deletions
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2
drivers/gpu/drm/i915/selftests/mock_gem_device.c
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@@ -57,7 +57,7 @@ static void mock_device_release(struct drm_device *dev)
cancel_delayed_work_sync(&i915->gt.retire_work);
cancel_delayed_work_sync(&i915->gt.idle_work);
flush_workqueue(i915->wq);
i915_gem_drain_workqueue(i915);
mutex_lock(&i915->drm.struct_mutex);
for_each_engine(engine, i915, id)