X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fchar%2Fgenrtc.c;h=aac0985a572b86811bae33317d7d4176e924d317;hb=9ea319b61613085f501a79cf8d405cb221d084f3;hp=69f0a2993af0f7456b118bcaa0931e7730751067;hpb=add096909da63ef32d6766f6771c07c9f16c6ee5;p=linux-2.6

diff --git a/drivers/char/genrtc.c b/drivers/char/genrtc.c
index 69f0a2993a..aac0985a57 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;
 }