cosa: Push the BKL down into the COSA driver

index 45ddfc9..35cff1a 100644
@@ -305,8 +305,8 @@ static ssize_t cosa_write(struct file *file,
 static unsigned int cosa_poll(struct file *file, poll_table *poll);
 static int cosa_open(struct inode *inode, struct file *file);
 static int cosa_release(struct inode *inode, struct file *file);
-static int cosa_chardev_ioctl(struct inode *inode, struct file *file,
-	unsigned int cmd, unsigned long arg);
+static long cosa_chardev_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg);
 #ifdef COSA_FASYNC_WORKING
 static int cosa_fasync(struct inode *inode, struct file *file, int on);
 #endif

@@ -317,7 +317,7 @@ static const struct file_operations cosa_fops = {
 	.read		= cosa_read,
 	.write		= cosa_write,
 	.poll		= cosa_poll,
-	.ioctl		= cosa_chardev_ioctl,
+	.unlocked_ioctl	= cosa_chardev_ioctl,
 	.open		= cosa_open,
 	.release	= cosa_release,
 #ifdef COSA_FASYNC_WORKING

@@ -1225,12 +1225,18 @@ static int cosa_sppp_ioctl(struct net_device *dev, struct ifreq *ifr,
 	return rv;
 }
 
-static int cosa_chardev_ioctl(struct inode *inode, struct file *file,
-	unsigned int cmd, unsigned long arg)
+static long cosa_chardev_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg)
 {
 	struct channel_data *channel = file->private_data;
-	struct cosa_data *cosa = channel->cosa;
-	return cosa_ioctl_common(cosa, channel, cmd, arg);
+	struct cosa_data *cosa;
+	long ret;
+	
+	lock_kernel();
+	cosa = channel->cosa;
+	ret = cosa_ioctl_common(cosa, channel, cmd, arg);
+	unlock_kernel();
+	return ret;
 }