[PATCH] NFS: fix client oops when debugging is on

nfs_readpage_release() causes an oops while accessing a file with NFS
debugging turned on (echo 32767 > /proc/sys/sunrpc/nfs_debug) and a kernel
built with CONFIG_DEBUG_SLAB.

This patch moves the debugging statement above nfs_release_request() to
avoid accessing freed memory.
Signed-off-by: NNick Wilson <njw@osdl.org>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/nfs/read.c

@@ -184,14 +184,13 @@ static void nfs_readpage_release(struct nfs_page *req)
 {
 	unlock_page(req->wb_page);
 
-	nfs_clear_request(req);
-	nfs_release_request(req);
-
 	dprintk("NFS: read done (%s/%Ld %d@%Ld)\n",
 			req->wb_context->dentry->d_inode->i_sb->s_id,
 			(long long)NFS_FILEID(req->wb_context->dentry->d_inode),
 			req->wb_bytes,
 			(long long)req_offset(req));
+	nfs_clear_request(req);
+	nfs_release_request(req);
 }
 
 /*