linux-kernel - [PATCH] lockdep: debug_locks check after check_chain

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Date:	Mon, 12 Feb 2007 14:47:53 +0100
From:	Jarek Poplawski <jarkao2@...pl>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH] lockdep: debug_locks check after check_chain_key

In __lock_acquire check_chain_key can turn off
debug_locks, so check is needed to assure proper
return code.

Signed-off-by: Jarek Poplawski <jarkao2@...pl>

---

diff -Nurp linux-2.6.20-git7-/kernel/lockdep.c linux-2.6.20-git7/kernel/lockdep.c
--- linux-2.6.20-git7-/kernel/lockdep.c	2007-02-12 13:13:15.000000000 +0100
+++ linux-2.6.20-git7/kernel/lockdep.c	2007-02-12 14:18:31.000000000 +0100
@@ -2228,6 +2228,10 @@ out_calc_hash:
 
 	curr->lockdep_depth++;
 	check_chain_key(curr);
+#ifdef CONFIG_DEBUG_LOCKDEP
+	if (unlikely(!debug_locks))
+		return 0;
+#endif
 	if (unlikely(curr->lockdep_depth >= MAX_LOCK_DEPTH)) {
 		debug_locks_off();
 		printk("BUG: MAX_LOCK_DEPTH too low!\n");
-
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