Fix filp being passed through raw ioctl handler

Don't pass meaningless file handles to block device ioctls.

The recent raw IO ioctl-passthrough fix started passing the raw file handle into the block device ioctl handler. That's unlikely to be useful, as the file handle is actually open on a character-mode raw device, not a block device, so dereferencing it is not going to yield useful results to a block device ioctl handler.

Previously we just passed NULL; also not a value that can usefully be dereferenced, but at least if it does happen, we'll oops instead of silently pretending that the file is a block device, so NULL is the more defensive option here. This patch reverts to that behaviour.

Noticed by Al Viro.

---
commit 844f68d0f8b098a80ccd6802c38daa7db05e00bd
tree 821049ac4ae8c959b67fab0ef8589007d6c8d048
parent ca3b9a7031878ad74f53734caba806a2ece34486
author Stephen Tweedie <[email protected]> Tue, 17 May 2005 18:30:49 +0100 committer Stephen Tweedie <[email protected]> Tue, 17 May 2005 18:30:49 +0100

 char/raw.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

Index: drivers/char/raw.c
===================================================================
@@ -122,7 +122,7 @@
 {
 	struct block_device *bdev = filp->private_data;
 
-	return blkdev_ioctl(bdev->bd_inode, filp, command, arg);
+	return blkdev_ioctl(bdev->bd_inode, NULL, command, arg);
 }
 
 static void bind_device(struct raw_config_request *rq)