linux-kernel - [060/105] UBIFS: do not read flash unnecessarily

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Message-Id: <20110412143554.396486104@clark.kroah.org>
Date:	Tue, 12 Apr 2011 07:34:49 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
Subject: [060/105] UBIFS: do not read flash unnecessarily

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------

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

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: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/ubifs/commit.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/ubifs/commit.c
+++ b/fs/ubifs/commit.c
@@ -521,7 +521,7 @@ int dbg_check_old_index(struct ubifs_inf
 	size_t sz;
 
 	if (!(ubifs_chk_flags & UBIFS_CHK_OLD_IDX))
-		goto out;
+		return 0;
 
 	INIT_LIST_HEAD(&list);
 


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