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drm/i915: Flush the workqueue before draining

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Trying to drain a workqueue while we may still be adding to it from
background tasks is, according to kernel/workqueue.c, verboten. So, add
a flush_workqueue() at the start of our cleanup procedure.

References: https://bugs.freedesktop.org/show_bug.cgi?id=110550
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190703171913.16585-4-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-07-03 18:19:13 +01:00
parent 2006058e99
commit 4fda44bf16
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/i915/i915_drv.h
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@ -2473,6 +2473,7 @@ static inline void i915_gem_drain_workqueue(struct drm_i915_private *i915)
*/
int pass = 3;
do {
flush_workqueue(i915->wq);
rcu_barrier();
i915_gem_drain_freed_objects(i915);
} while (--pass);