From: Eric Dumazet <edumazet@google.com>
Date: Thu, 17 May 2012 23:52:26 +0000 (+0000)
Subject: pktgen: fix module unload for good
X-Git-Url: http://git.alex.org.uk?hp=42ea7d7f2a7356962022cdd124d9043c488ca5e2

pktgen: fix module unload for good

commit c57b5468406 (pktgen: fix crash at module unload) did a very poor
job with list primitives.

1) list_splice() arguments were in the wrong order

2) list_splice(list, head) has undefined behavior if head is not
initialized.

3) We should use the list_splice_init() variant to clear pktgen_threads
list.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 77a5998..b81369b 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3755,13 +3755,13 @@ static void __exit pg_cleanup(void)
 {
 	struct pktgen_thread *t;
 	struct list_head *q, *n;
-	struct list_head list;
+	LIST_HEAD(list);
 
 	/* Stop all interfaces & threads */
 	pktgen_exiting = true;
 
 	mutex_lock(&pktgen_thread_lock);
-	list_splice(&list, &pktgen_threads);
+	list_splice_init(&pktgen_threads, &list);
 	mutex_unlock(&pktgen_thread_lock);
 
 	list_for_each_safe(q, n, &list) {