1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/lib/locks.c b/arch/powerpc/lib/locks.c
index 0c9c8d7d0734..170a0346f756 100644
--- a/arch/powerpc/lib/locks.c
+++ b/arch/powerpc/lib/locks.c
@@ -70,12 +70,16 @@ void __rw_yield(arch_rwlock_t *rw)
 
 void arch_spin_unlock_wait(arch_spinlock_t *lock)
 {
+        smp_mb();
+
         while (lock->slock) {
                 HMT_low();
                 if (SHARED_PROCESSOR)
                         __spin_yield(lock);
         }
         HMT_medium();
+
+        smp_mb();
 }
 
 EXPORT_SYMBOL(arch_spin_unlock_wait);