serio: BKL pushdown

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

drivers/input/serio/serio_raw.c

@@ -10,6 +10,7 @@
  */
 
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/poll.h>
 #include <linux/module.h>
 #include <linux/serio.h>
@@ -81,9 +82,10 @@ static int serio_raw_open(struct inode *inode, struct file *file)
 	struct serio_raw_list *list;
 	int retval = 0;
 
+	lock_kernel();
 	retval = mutex_lock_interruptible(&serio_raw_mutex);
 	if (retval)
-		return retval;
+		goto out_bkl;
 
 	if (!(serio_raw = serio_raw_locate(iminor(inode)))) {
 		retval = -ENODEV;
@@ -108,6 +110,8 @@ static int serio_raw_open(struct inode *inode, struct file *file)
 
 out:
 	mutex_unlock(&serio_raw_mutex);
+out_bkl:
+	unlock_kernel();
 	return retval;
 }