linux-kernel - [34-longterm 030/196] UBIFS: do not read flash unnecessarily

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Date:	Mon, 12 Mar 2012 20:12:38 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 030/196] UBIFS: do not read flash unnecessarily

From: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    If you see a problem with using this for longterm, please comment.
                   -------------------

commit 8b229c76765816796eec7ccd428f03bd8de8b525 upstream.

This fix makes the 'dbg_check_old_index()' function return
immediately if debugging is disabled, instead of executing
incorrect 'goto out' which causes UBIFS to:

1. Allocate memory
2. Read the flash

On every commit. OK, we do not commit that often, but it is
still silly to do unneeded I/O anyway.

Credits to coverity for spotting this silly issue.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 fs/ubifs/commit.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ubifs/commit.c b/fs/ubifs/commit.c
index 37fa7ed..de01f28 100644
--- a/fs/ubifs/commit.c
+++ b/fs/ubifs/commit.c
@@ -519,7 +519,7 @@ int dbg_check_old_index(struct ubifs_info *c, struct ubifs_zbranch *zroot)
 	size_t sz;
 
 	if (!(ubifs_chk_flags & UBIFS_CHK_OLD_IDX))
-		goto out;
+		return 0;
 
 	INIT_LIST_HEAD(&list);
 
-- 
1.7.9.3

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