diff --git a/arch/powerpc/lib/locks.c b/arch/powerpc/lib/locks.c
index bb7cfec..7a7c31b 100644
--- a/arch/powerpc/lib/locks.c
+++ b/arch/powerpc/lib/locks.c
@@ -72,8 +72,10 @@ void arch_spin_unlock_wait(arch_spinlock_t *lock)
 {
 	while (lock->slock) {
 		HMT_low();
+		preempt_disable();
 		if (SHARED_PROCESSOR)
 			__spin_yield(lock);
+		preempt_enable();
 	}
 	HMT_medium();
 }