diff options
| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-07-04 23:35:27 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-07-11 14:36:34 +0200 |
| commit | 2adbee62e00d869a30cb93ea2269e5ea26a9bbc4 (patch) | |
| tree | a58ecc9d6d040bb8e29b2cbc7fea1e7ae757347c | |
| parent | 41a05a3a5cdc5d731014588b9a24759af1804d48 (diff) | |
drm/i915: queue work outside spinlock in hsw_pm_irq_handler
And kill the comment about it. Queueing work is a barrier type event,
no amount of locking will help in ordering things (as long as we queue
the work after having updated all relevant data structures). Also, the
queue_work works itself as a sufficient memory barrier.
Again on the surface this is just a tiny micro-optimization to reduce
the hold-time of dev_priv->irq_lock. But the better reason is that it
reduces superficial locking and so makes it clearer what we actually
need for correctness.
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
| -rw-r--r-- | drivers/gpu/drm/i915/i915_irq.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index d4af1154128..04861995fe1 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -969,9 +969,9 @@ static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv, I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir); /* never want to mask useful interrupts. (also posting read) */ WARN_ON(I915_READ_NOTRACE(GEN6_PMIMR) & ~GEN6_PM_RPS_EVENTS); - /* TODO: if queue_work is slow, move it out of the spinlock */ - queue_work(dev_priv->wq, &dev_priv->rps.work); spin_unlock(&dev_priv->rps.lock); + + queue_work(dev_priv->wq, &dev_priv->rps.work); } if (pm_iir & PM_VEBOX_USER_INTERRUPT) |