From: "Yingchao Zhou" <yingchao.zhou@gmail.com>

An up() is called in kernel/stop_machine.c on failure, and also in the
caller (unconditionally).

Signed-off-by: Zhou Yingchao <yingchao.zhou@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 kernel/stop_machine.c |    1 -
 1 files changed, 1 deletion(-)

diff -puN kernel/stop_machine.c~remove-redundent-up-in-stop_machine kernel/stop_machine.c
--- a/kernel/stop_machine.c~remove-redundent-up-in-stop_machine
+++ a/kernel/stop_machine.c
@@ -111,7 +111,6 @@ static int stop_machine(void)
 	/* If some failed, kill them all. */
 	if (ret < 0) {
 		stopmachine_set_state(STOPMACHINE_EXIT);
-		up(&stopmachine_mutex);
 		return ret;
 	}
 
_