1 files changed, 32 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
index 620b6fab2c5c..92adfee30c7c 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -434,7 +434,7 @@ static inline u32 hwsp_seqno(const struct i915_request *rq)
 
 static inline bool __i915_request_has_started(const struct i915_request *rq)
 {
-	return i915_seqno_passed(hwsp_seqno(rq), rq->fence.seqno - 1);
+	return i915_seqno_passed(__hwsp_seqno(rq), rq->fence.seqno - 1);
 }
 
 /**
@@ -465,11 +465,19 @@ static inline bool __i915_request_has_started(const struct i915_request *rq)
  */
 static inline bool i915_request_started(const struct i915_request *rq)
 {
+	bool result;
+
 	if (i915_request_signaled(rq))
 		return true;
 
-	/* Remember: started but may have since been preempted! */
-	return __i915_request_has_started(rq);
+	result = true;
+	rcu_read_lock(); /* the HWSP may be freed at runtime */
+	if (likely(!i915_request_signaled(rq)))
+		/* Remember: started but may have since been preempted! */
+		result = __i915_request_has_started(rq);
+	rcu_read_unlock();
+
+	return result;
 }
 
 /**
@@ -482,10 +490,16 @@ static inline bool i915_request_started(const struct i915_request *rq)
  */
 static inline bool i915_request_is_running(const struct i915_request *rq)
 {
+	bool result;
+
 	if (!i915_request_is_active(rq))
 		return false;
 
-	return __i915_request_has_started(rq);
+	rcu_read_lock();
+	result = __i915_request_has_started(rq) && i915_request_is_active(rq);
+	rcu_read_unlock();
+
+	return result;
 }
 
 /**
@@ -509,12 +523,25 @@ static inline bool i915_request_is_ready(const struct i915_request *rq)
 	return !list_empty(&rq->sched.link);
 }
 
+static inline bool __i915_request_is_complete(const struct i915_request *rq)
+{
+	return i915_seqno_passed(__hwsp_seqno(rq), rq->fence.seqno);
+}
+
 static inline bool i915_request_completed(const struct i915_request *rq)
 {
+	bool result;
+
 	if (i915_request_signaled(rq))
 		return true;
 
-	return i915_seqno_passed(hwsp_seqno(rq), rq->fence.seqno);
+	result = true;
+	rcu_read_lock(); /* the HWSP may be freed at runtime */
+	if (likely(!i915_request_signaled(rq)))
+		result = __i915_request_is_complete(rq);
+	rcu_read_unlock();
+
+	return result;
 }
 
 static inline void i915_request_mark_complete(struct i915_request *rq)