linux-kernel - [RESEND PATCH 11/11] kernel:lockdep:fix return value of check

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Date:	Sun, 28 Jun 2009 23:04:46 +0800
From:	tom.leiming@...il.com
To:	a.p.zijlstra@...llo.nl
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, Ming Lei <tom.leiming@...il.com>
Subject: [RESEND PATCH 11/11] kernel:lockdep:fix return value of check_usage*()

From: Ming Lei <tom.leiming@...il.com>

Return zero if BFS find the target, so fix return value of callers
of BFS.

The patch fixes the boot failure introduced by the patch:
	lockdep: clean up after BFS patches
.

Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 kernel/lockdep.c |   20 ++++++++++++--------
 1 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 09a141f..48c3364 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -1250,8 +1250,6 @@ find_usage_forwards(struct lock_list *root, enum lock_usage_bit bit,
 	debug_atomic_inc(&nr_find_usage_forwards_checks);
 
 	result = __bfs_forwards(root, (void *)bit, usage_match, target_entry);
-	if (result < 0)
-		return print_bfs_bug(result);
 
 	return result;
 }
@@ -1275,8 +1273,6 @@ find_usage_backwards(struct lock_list *root, enum lock_usage_bit bit,
 	debug_atomic_inc(&nr_find_usage_backwards_checks);
 
 	result = __bfs_backwards(root, (void *)bit, usage_match, target_entry);
-	if (result < 0)
-		return print_bfs_bug(result);
 
 	return result;
 }
@@ -1397,13 +1393,17 @@ check_usage(struct task_struct *curr, struct held_lock *prev,
 
 	this.class = hlock_class(prev);
 	ret = find_usage_backwards(&this, bit_backwards, &target_entry);
-	if (!ret || ret == 1)
+	if (ret < 0)
+		return print_bfs_bug(ret);
+	if (ret == 1)
 		return ret;
 
 	that.parent = NULL;
 	that.class = hlock_class(next);
 	ret = find_usage_forwards(&that, bit_forwards, &target_entry1);
-	if (!ret || ret == 1)
+	if (ret < 0)
+		return print_bfs_bug(ret);
+	if (ret == 1)
 		return ret;
 
 	return print_bad_irq_dependency(curr, &this, &that,
@@ -2088,7 +2088,9 @@ check_usage_forwards(struct task_struct *curr, struct held_lock *this,
 	root.parent = NULL;
 	root.class = hlock_class(this);
 	ret = find_usage_forwards(&root, bit, &target_entry);
-	if (!ret || ret == 1)
+	if (ret < 0)
+		return print_bfs_bug(ret);
+	if (ret == 1)
 		return ret;
 
 	return print_irq_inversion_bug(curr, &root, target_entry,
@@ -2110,7 +2112,9 @@ check_usage_backwards(struct task_struct *curr, struct held_lock *this,
 	root.parent = NULL;
 	root.class = hlock_class(this);
 	ret = find_usage_backwards(&root, bit, &target_entry);
-	if (!ret || ret == 1)
+	if (ret < 0)
+		return print_bfs_bug(ret);
+	if (ret == 1)
 		return ret;
 
 	return print_irq_inversion_bug(curr, &root, target_entry,
-- 
1.6.0.GIT

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