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drm/i915: Replace lockless_dereference(bool) with READ_ONCE() 

After Joonas complained about using READ_ONCE() on the only use of the
variable in the function, where the intent was to simply document that
the read was intentionally racy and unlocked, I switched the READ_ONCE()
over to lockless_dereference(). However, in linux-next that has a
stronger type-check to only allow pointers and is no longer
interchangeable with READ_ONCE(), see commit 331b6d8c7a
("locking/barriers: Validate lockless_dereference() is used on a pointer
type")

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: 67d97da349 ("drm/i915: Only start retire worker when idle")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1467705276-707-1-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
This commit is contained in:
Chris Wilson 2016-07-05 08:54:36 +01:00
parent af1346a0f3
commit b1379d4964
2 changed files with 2 additions and 2 deletions
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2
drivers/gpu/drm/i915/i915_gem.c
View File

@ -3290,7 +3290,7 @@ i915_gem_retire_work_handler(struct work_struct *work)
* We do not need to do this test under locking as in the worst-case
* we queue the retire worker once too often.
*/
if (lockless_dereference(dev_priv->gt.awake))
if (READ_ONCE(dev_priv->gt.awake))
queue_delayed_work(dev_priv->wq,
&dev_priv->gt.retire_work,
round_jiffies_up_relative(HZ));

2
drivers/gpu/drm/i915/i915_irq.c
View File

@ -3095,7 +3095,7 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
if (!i915.enable_hangcheck)
return;
if (!lockless_dereference(dev_priv->gt.awake))
if (!READ_ONCE(dev_priv->gt.awake))
return;
/* As enabling the GPU requires fairly extensive mmio access,