qeth: avoid duplicate deletion of multicast addresses
if qeth_set_multicast_list() is performed on 2 CPUs in parallel,
card->ip_list may end corrupted.
Solution: In function __qeth_delete_all_mc()
remove card->ip_list entry before invoking
qeth_deregister_addr_entry(). Thus a 2nd invocation of
qeth_set_multicast_list() cannot try to remove the
same entry twice.
Signed-off-by Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/s390/net/qeth_main.c b/drivers/s390/net/qeth_main.c
index fe616479..6d7b79e 100644
--- a/drivers/s390/net/qeth_main.c
+++ b/drivers/s390/net/qeth_main.c
@@ -823,14 +823,15 @@
again:
list_for_each_entry_safe(addr, tmp, &card->ip_list, entry) {
if (addr->is_multicast) {
+ list_del(&addr->entry);
spin_unlock_irqrestore(&card->ip_lock, *flags);
rc = qeth_deregister_addr_entry(card, addr);
spin_lock_irqsave(&card->ip_lock, *flags);
if (!rc) {
- list_del(&addr->entry);
kfree(addr);
goto again;
- }
+ } else
+ list_add(&addr->entry, &card->ip_list);
}
}
}