diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
index cd931ef..5a8ca61 100644
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -470,7 +470,9 @@
 	 * transaction!  Now comes the tricky part: we need to write out
 	 * metadata.  Loop over the transaction's entire buffer list:
 	 */
+	spin_lock(&journal->j_state_lock);
 	commit_transaction->t_state = T_COMMIT;
+	spin_unlock(&journal->j_state_lock);
 
 	J_ASSERT(commit_transaction->t_nr_buffers <=
 		 commit_transaction->t_outstanding_credits);