1 files changed, 4 insertions, 2 deletions

diff --git a/kernel/mutex.c b/kernel/mutex.c
index ff05f4bd86eb..7ff48c55a98b 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -209,11 +209,13 @@ int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner)
  */
 static inline int mutex_can_spin_on_owner(struct mutex *lock)
 {
+        struct task_struct *owner;
         int retval = 1;
 
         rcu_read_lock();
-        if (lock->owner)
-                retval = lock->owner->on_cpu;
+        owner = ACCESS_ONCE(lock->owner);
+        if (owner)
+                retval = owner->on_cpu;
         rcu_read_unlock();
         /*
          * if lock->owner is not set, the mutex owner may have just acquired