linux-kernel - [PATCH 2/2] notifiers: double register detection

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Message-ID: <105a9bce-5539-73f1-2683-e52dba870c04@virtuozzo.com>
Date:   Wed, 21 Sep 2016 15:33:11 +0300
From:   Vasily Averin <vvs@...tuozzo.com>
To:     linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org
Cc:     "J. Bruce Fields" <bfields@...ldses.org>,
        Jeff Layton <jlayton@...chiereds.net>,
        Scott Mayhew <smayhew@...hat.com>
Subject: [PATCH 2/2] notifiers: double register detection

WARN_ON should help to detect double register of the same notifiers

Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
---
 kernel/notifier.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/notifier.c b/kernel/notifier.c
index fd2c9ac..e02b2f0 100644
--- a/kernel/notifier.c
+++ b/kernel/notifier.c
@@ -22,6 +22,7 @@ static int notifier_chain_register(struct notifier_block **nl,
 		struct notifier_block *n)
 {
 	while ((*nl) != NULL) {
+		WARN_ON((*nl) == n);
 		if (n->priority > (*nl)->priority)
 			break;
 		nl = &((*nl)->next);
-- 
1.9.1