1 files changed, 5 insertions, 1 deletions

diff --git a/include/asm-generic/mutex-xchg.h b/include/asm-generic/mutex-xchg.h
index a6b4a7bd6ac9..3269ec4e195f 100644
--- a/include/asm-generic/mutex-xchg.h
+++ b/include/asm-generic/mutex-xchg.h
@@ -91,8 +91,12 @@ __mutex_fastpath_unlock(atomic_t *count, void (*fail_fn)(atomic_t *))
 static inline int
 __mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *))
 {
-        int prev = atomic_xchg_acquire(count, 0);
+        int prev;
 
+        if (atomic_read(count) != 1)
+                return 0;
+
+        prev = atomic_xchg_acquire(count, 0);
         if (unlikely(prev < 0)) {
                 /*
                  * The lock was marked contended so we must restore that