nwflash: Push down BKL

index ba012c2..02d882b 100644
@@ -95,8 +95,11 @@ static int get_flash_id(void)
 	return c2;
 }
 
-static int flash_ioctl(struct inode *inodep, struct file *filep, unsigned int cmd, unsigned long arg)
+static long flash_ioctl(struct file *filep, unsigned int cmd,
+							unsigned long arg)
 {
+	long ret = 0;
+	lock_kernel();
 	switch (cmd) {
 	case CMD_WRITE_DISABLE:
 		gbWriteBase64Enable = 0;

@@ -114,9 +117,10 @@ static int flash_ioctl(struct inode *inodep, struct file *filep, unsigned int cm
 	default:
 		gbWriteBase64Enable = 0;
 		gbWriteEnable = 0;
-		return -EINVAL;
+		ret = -ENOTTY;
 	}
-	return 0;
+	unlock_kernel();
+	return ret;
 }
 
 static ssize_t flash_read(struct file *file, char __user *buf, size_t size,

@@ -647,7 +651,7 @@ static const struct file_operations flash_fops =
 	.llseek		= flash_llseek,
 	.read		= flash_read,
 	.write		= flash_write,
-	.ioctl		= flash_ioctl,
+	.unlocked_ioctl	= flash_ioctl,
 };
 
 static struct miscdevice flash_miscdev =