jbd: replace potentially false assertion with if block

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@dghda.com
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index b99c3b3654c49ee33f86bc8883319a55f11a9711..15ea16ad8662490fc3f2ccf620266f44af145d33 100644 (file)
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -1636,9 +1636,10 @@ static int journal_init_journal_head_cache(void)
 
 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;
+       }
 }
 
 /*