Assume that intel_wakereg_get() may take the mutex, and perform other
sleeping actions in the course of its callbacks and so use might_sleep()
to ensure that all callers abide. Anything that cannot sleep has to use
e.g. intel_wakeref_get_if_active() to avoid hitting the non-atomic
paths.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/intel_wakeref.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/i915/intel_wakeref.h
b/drivers/gpu/drm/i915/intel_wakeref.h
index cbc4fc0d653f..1686bc76881a 100644
--- a/drivers/gpu/drm/i915/intel_wakeref.h
+++ b/drivers/gpu/drm/i915/intel_wakeref.h
@@ -76,6 +76,7 @@ void __intel_wakeref_put_last(struct intel_wakeref *wf,
unsigned long flags);
static inline int
intel_wakeref_get(struct intel_wakeref *wf)
{
+ might_sleep();
if (unlikely(!atomic_inc_not_zero(&wf->count)))
return __intel_wakeref_get_first(wf);
--
2.24.0
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