From: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Date: Mon, 1 Oct 2012 09:08:37 +0000 (-0600)
Subject: Btrfs: confirmation of value is added before trace_btrfs_get_extent() is called
X-Git-Tag: v3.7-rc1~71^2~15
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=f0bd95ea72644cbf9210606f6f8edfce13d65d47;p=~emulex%2Finfiniband.git

Btrfs: confirmation of value is added before trace_btrfs_get_extent() is called

We should confirm the value of extent_map before calling
trace_btrfs_get_extent() because the value of extent_map has the
possibility of NULL.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
---

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d24b6501461..f92def2467a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5505,7 +5505,8 @@ insert:
 	write_unlock(&em_tree->lock);
 out:
 
-	trace_btrfs_get_extent(root, em);
+	if (em)
+		trace_btrfs_get_extent(root, em);
 
 	if (path)
 		btrfs_free_path(path);