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drm/i915: Avoid blocking the kworker thread on a stuck mutex

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Just reschedule the retire requests again if the device is currently
busy. The request list will be pruned along other paths so will never
grow unbounded and so we can afford to miss the occasional pruning.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-09-29 12:26:37 +01:00
parent 3d2a812ae4
commit 891b48cfc8
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/i915/i915_gem.c
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@ -1901,7 +1901,12 @@ i915_gem_retire_work_handler(struct work_struct *work)
mm.retire_work.work);
dev = dev_priv->dev;
mutex_lock(&dev->struct_mutex);
/* Come back later if the device is busy... */
if (!mutex_trylock(&dev->struct_mutex)) {
queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, HZ);
return;
}
i915_gem_retire_requests(dev);
if (!dev_priv->mm.suspended &&