Upgrade to 4.4.50-rt62

[kvmfornfv.git] / kernel / kernel / locking / rtmutex_common.h

diff --git a/kernel/kernel/locking/rtmutex_common.h b/kernel/kernel/locking/rtmutex_common.h
index 289f062..f457c75 100644 (file)
--- a/kernel/kernel/locking/rtmutex_common.h
+++ b/kernel/kernel/locking/rtmutex_common.h
@@ -76,8 +76,9 @@ task_top_pi_waiter(struct task_struct *p)
 
 static inline struct task_struct *rt_mutex_owner(struct rt_mutex *lock)
 {
-       return (struct task_struct *)
-               ((unsigned long)lock->owner & ~RT_MUTEX_OWNER_MASKALL);
+       unsigned long owner = (unsigned long) READ_ONCE(lock->owner);
+
+       return (struct task_struct *) (owner & ~RT_MUTEX_OWNER_MASKALL);
 }
 
 /*