Use lockdep to warn before we wait indefinitely in case we may be
waiting indefinitely.
Suggested-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
References: 2caffbf11762 ("drm/i915: Revoke mmaps and prevent access to fence registers across reset")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reset.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c
index c1b53533ada6..12e74decd7a2 100644
--- a/drivers/gpu/drm/i915/i915_reset.c
+++ b/drivers/gpu/drm/i915/i915_reset.c
@@ -1305,6 +1305,9 @@ int i915_reset_trylock(struct drm_i915_private *i915)
struct i915_gpu_error *error = &i915->gpu_error;
int srcu;
+ might_lock(&error->reset_backoff_srcu);
+ might_sleep();
+
rcu_read_lock();
while (test_bit(I915_RESET_BACKOFF, &error->flags)) {
rcu_read_unlock();
--
2.20.1
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