diff --git a/[refs] b/[refs]
index 0368d2b70581..33c65c473f3a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b14f21906774be181627412fed5b6b5fae2b53a2
+refs/heads/master: ab306cae660e524edbeb8889e4e23d3c97717b9c
diff --git a/trunk/arch/tile/include/asm/spinlock_64.h b/trunk/arch/tile/include/asm/spinlock_64.h
index 72be5904e020..5f8b6a095fd8 100644
--- a/trunk/arch/tile/include/asm/spinlock_64.h
+++ b/trunk/arch/tile/include/asm/spinlock_64.h
@@ -137,7 +137,7 @@ static inline void arch_read_unlock(arch_rwlock_t *rw)
 static inline void arch_write_unlock(arch_rwlock_t *rw)
 {
 	__insn_mf();
-	rw->lock = 0;
+	__insn_exch4(&rw->lock, 0);  /* Avoid waiting in the write buffer. */
 }
 
 static inline int arch_read_trylock(arch_rwlock_t *rw)