drivers: Remove BKL from misc_open

misc_open() is already serialized with misc_mtx. Remove the BKL
locking which got there via the BKL pushdown.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
LKML-Reference: <20091010153349.237173041@linutronix.de>

drivers/char/misc.c

@@ -49,7 +49,6 @@
 #include <linux/device.h>
 #include <linux/tty.h>
 #include <linux/kmod.h>
-#include <linux/smp_lock.h>
 
 /*
  * Head entry for the doubly linked miscdevice list
@@ -118,8 +117,7 @@ static int misc_open(struct inode * inode, struct file * file)
 	struct miscdevice *c;
 	int err = -ENODEV;
 	const struct file_operations *old_fops, *new_fops = NULL;
-	
-	lock_kernel();
+
 	mutex_lock(&misc_mtx);
 	
 	list_for_each_entry(c, &misc_list, list) {
@@ -157,7 +155,6 @@ static int misc_open(struct inode * inode, struct file * file)
 	fops_put(old_fops);
 fail:
 	mutex_unlock(&misc_mtx);
-	unlock_kernel();
 	return err;
 }