[PATCH V2] poweroff: fix bug in orderly_poweroff

[hongfeng <hongfeng@marvell.com>]

orderly_poweroff is trying to poweroff platform by two steps:
step 1: Call userspace application to poweroff
step 2: If userspace poweroff fail, then do a force power off if force param is set.

The bug here is, step 1 is always successful with param UMH_NO_WAIT,
should change to UMH_WAIT_EXEC which will monitor whether user application successful run.

Change-Id: I2f9ebbb90c0c2443780080ec9507c8d004e5da74
Signed-off-by: Feng Hong <hongfeng@marvell.com>
Acked-by: Kees Cook <keescook@chromium.org>
---
 kernel/sys.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index 241507f..a624d4c 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2204,7 +2204,7 @@ static int __orderly_poweroff(void)
 		return -ENOMEM;
 	}
 
-	ret = call_usermodehelper_fns(argv[0], argv, envp, UMH_NO_WAIT,
+	ret = call_usermodehelper_fns(argv[0], argv, envp, UMH_WAIT_EXEC,
 				      NULL, argv_cleanup, NULL);
 	if (ret == -ENOMEM)
 		argv_free(argv);
-- 
1.7.0.4