Add a bunch of cycle_kernel_lock() calls

All of the open() functions which don't need the BKL on their face may
still depend on its acquisition to serialize opens against driver
initialization.  So make those functions acquire then release the BKL to be
on the safe side.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

drivers/isdn/hardware/eicon/divasi.c

@@ -17,6 +17,7 @@
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
 #include <linux/skbuff.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 
 #include "platform.h"
@@ -400,6 +401,7 @@ static unsigned int um_idi_poll(struct file *file, poll_table * wait)
 
 static int um_idi_open(struct inode *inode, struct file *file)
 {
+	cycle_kernel_lock();
 	return (0);
 }