linux-ext4 - [patch 064/277] jbd: replace potentially false assertion with if block

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Date:	Fri, 25 Jul 2008 01:46:19 -0700
From:	akpm@...ux-foundation.org
To:	torvalds@...ux-foundation.org
Cc:	akpm@...ux-foundation.org, duaneg@...da.com,
	linux-ext4@...r.kernel.org
Subject: [patch 064/277] jbd: replace potentially false assertion with if block

From: "Duane Griffin" <duaneg@...da.com>

If an error occurs during jbd cache initialisation it is possible for the
journal_head_cache to be NULL when journal_destroy_journal_head_cache is
called.  Replace the J_ASSERT with an if block to handle the situation
correctly.

Note that even with this fix things will break badly if jbd is statically
compiled in and cache initialisation fails.

Signed-off-by: Duane Griffin <duaneg@...da.com
Cc: <linux-ext4@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 fs/jbd/journal.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff -puN fs/jbd/journal.c~jbd-replace-potentially-false-assertion-with-if-block fs/jbd/journal.c
--- a/fs/jbd/journal.c~jbd-replace-potentially-false-assertion-with-if-block
+++ a/fs/jbd/journal.c
@@ -1636,9 +1636,10 @@ static int journal_init_journal_head_cac
 
 static void journal_destroy_journal_head_cache(void)
 {
-	J_ASSERT(journal_head_cache != NULL);
-	kmem_cache_destroy(journal_head_cache);
-	journal_head_cache = NULL;
+	if (journal_head_cache) {
+		kmem_cache_destroy(journal_head_cache);
+		journal_head_cache = NULL;
+	}
 }
 
 /*
_
--
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