From 742a2fe31bf311d065a2bbacc2b363103b351300 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 20 May 2008 19:15:55 +0200
Subject: [PATCH] genrtc: BKL pushdown

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

diff --git a/drivers/char/genrtc.c b/drivers/char/genrtc.c
index 69f0a2993af..aac0985a572 100644
--- a/drivers/char/genrtc.c
+++ b/drivers/char/genrtc.c
@@ -51,6 +51,7 @@
 #include <linux/init.h>
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
 #include <linux/workqueue.h>
 
 #include <asm/uaccess.h>
@@ -338,12 +339,16 @@ static int gen_rtc_ioctl(struct inode *inode, struct file *file,
 
 static int gen_rtc_open(struct inode *inode, struct file *file)
 {
-	if (gen_rtc_status & RTC_IS_OPEN)
+	lock_kernel();
+	if (gen_rtc_status & RTC_IS_OPEN) {
+		unlock_kernel();
 		return -EBUSY;
+	}
 
 	gen_rtc_status |= RTC_IS_OPEN;
 	gen_rtc_irq_data = 0;
 	irq_active = 0;
+	unlock_kernel();
 
 	return 0;
 }
-- 
2.41.0