From 3e0420f066c632e135939ccf218ae793e02dccd7 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 20 May 2008 19:17:01 +0200
Subject: vmwatchdog: BKL pushdown

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/s390/char/vmwatchdog.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/char/vmwatchdog.c b/drivers/s390/char/vmwatchdog.c
index 19f8389291b..ee80e936d51 100644
--- a/drivers/s390/char/vmwatchdog.c
+++ b/drivers/s390/char/vmwatchdog.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/watchdog.h>
+#include <linux/smp_lock.h>
 
 #include <asm/ebcdic.h>
 #include <asm/io.h>
@@ -131,11 +132,15 @@ static int __init vmwdt_probe(void)
 static int vmwdt_open(struct inode *i, struct file *f)
 {
 	int ret;
-	if (test_and_set_bit(0, &vmwdt_is_open))
+	lock_kernel();
+	if (test_and_set_bit(0, &vmwdt_is_open)) {
+		unlock_kernel();
 		return -EBUSY;
+	}
 	ret = vmwdt_keepalive();
 	if (ret)
 		clear_bit(0, &vmwdt_is_open);
+	unlock_kernel();
 	return ret ? ret : nonseekable_open(i, f);
 }
 
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