1 files changed, 2 insertions, 24 deletions

diff --git a/include/asm-generic/mutex-dec.h b/include/asm-generic/mutex-dec.h
index ed108be6743f..f104af7cf437 100644
--- a/include/asm-generic/mutex-dec.h
+++ b/include/asm-generic/mutex-dec.h
@@ -22,8 +22,6 @@ __mutex_fastpath_lock(atomic_t *count, void (*fail_fn)(atomic_t *))
 {
         if (unlikely(atomic_dec_return(count) < 0))
                 fail_fn(count);
-        else
-                smp_mb();
 }
 
 /**
@@ -41,10 +39,7 @@ __mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
 {
         if (unlikely(atomic_dec_return(count) < 0))
                 return fail_fn(count);
-        else {
-                smp_mb();
-                return 0;
-        }
+        return 0;
 }
 
 /**
@@ -63,7 +58,6 @@ __mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
 static inline void
 __mutex_fastpath_unlock(atomic_t *count, void (*fail_fn)(atomic_t *))
 {
-        smp_mb();
         if (unlikely(atomic_inc_return(count) <= 0))
                 fail_fn(count);
 }
@@ -88,25 +82,9 @@ __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 *))
 {
-        /*
-         * We have two variants here. The cmpxchg based one is the best one
-         * because it never induce a false contention state.  It is included
-         * here because architectures using the inc/dec algorithms over the
-         * xchg ones are much more likely to support cmpxchg natively.
-         *
-         * If not we fall back to the spinlock based variant - that is
-         * just as efficient (and simpler) as a 'destructive' probing of
-         * the mutex state would be.
-         */
-#ifdef __HAVE_ARCH_CMPXCHG
-        if (likely(atomic_cmpxchg(count, 1, 0) == 1)) {
-                smp_mb();
+        if (likely(atomic_cmpxchg(count, 1, 0) == 1))
                 return 1;
-        }
         return 0;
-#else
-        return fail_fn(count);
-#endif
 }
 
 #endif