efirtc: BKL pushdown

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/drivers/char/efirtc.c b/drivers/char/efirtc.c
index 49233f5..d57ca3e 100644
--- a/drivers/char/efirtc.c
+++ b/drivers/char/efirtc.c
@@ -28,6 +28,7 @@
  */
 
 
+#include <linux/smp_lock.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/miscdevice.h>
@@ -272,6 +273,7 @@
 	 * We do accept multiple open files at the same time as we
 	 * synchronize on the per call operation.
 	 */
+	cycle_kernel_lock();
 	return 0;
 }