From: Dan Carpenter <error27@gmail.com>
Date: Sat, 20 Mar 2010 11:22:10 +0000 (+0000)
Subject: Btrfs: check btrfs_get_extent return for IS_ERR()
X-Git-Tag: v3.0~4995^2~10
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6cf8bfbf5e88edfb09a2bf0631a067060f534592;p=platform%2Fkernel%2Flinux-amlogic.git

Btrfs: check btrfs_get_extent return for IS_ERR()

btrfs_get_extent() never returns NULL, only a valid pointer or ERR_PTR()

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 74d8913..2b7dd88 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -510,7 +510,7 @@ static int should_defrag_range(struct inode *inode, u64 start, u64 len,
 		em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
 		unlock_extent(io_tree, start, start + len - 1, GFP_NOFS);
 
-		if (!em)
+		if (IS_ERR(em))
 			return 0;
 	}