[2/2] notifiers: double register detection

Commit Message

Vasily Averin Sept. 21, 2016, 12:33 p.m. UTC

WARN_ON should help to detect double register of the same notifiers

Signed-off-by: Vasily Averin <[e-mail]>
---
 kernel/notifier.c | 1 +
 1 file changed, 1 insertion(+)

Patch

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);