genrtc: BKL pushdown

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/drivers/char/genrtc.c b/drivers/char/genrtc.c
index 69f0a2993af0f7456b118bcaa0931e7730751067..aac0985a572b86811bae33317d7d4176e924d317 100644 (file)
--- 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;
 }