From: Simon Wunderlich <sw-2YrNx6rUIHYiY0qSoAWiAoQuADTiUCJX@public.gmane.org>
To: davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
b.a.t.m.a.n-ZwoEplunGu2X36UT3dwllkB+6BGkLq7r@public.gmane.org,
Sven Eckelmann
<sven.eckelmann-2BnEqQcu77q1Z/+hSey0Gg@public.gmane.org>
Subject: [PATCH 1/3] batman-adv: Modify neigh_list only with rcu-list functions
Date: Wed, 26 Oct 2016 17:55:13 +0200 [thread overview]
Message-ID: <20161026155515.18075-2-sw@simonwunderlich.de> (raw)
In-Reply-To: <20161026155515.18075-1-sw-2YrNx6rUIHYiY0qSoAWiAoQuADTiUCJX@public.gmane.org>
From: Sven Eckelmann <sven.eckelmann-2BnEqQcu77q1Z/+hSey0Gg@public.gmane.org>
The batadv_hard_iface::neigh_list is accessed via rcu based primitives.
Thus all operations done on it have to fulfill the requirements by RCU. So
using non-RCU mechanisms like hlist_add_head is not allowed because it
misses the barriers required to protect concurrent readers when accessing
the data behind the pointer.
Fixes: cef63419f7db ("batman-adv: add list of unique single hop neighbors per hard-interface")
Signed-off-by: Sven Eckelmann <sven.eckelmann-2BnEqQcu77q1Z/+hSey0Gg@public.gmane.org>
Acked-by: Linus Lüssing <linus.luessing-djzkFPsfvsizQB+pC5nmwQ@public.gmane.org>
Signed-off-by: Simon Wunderlich <sw-2YrNx6rUIHYiY0qSoAWiAoQuADTiUCJX@public.gmane.org>
---
net/batman-adv/originator.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 5f3bfc4..7c8d160 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -544,7 +544,7 @@ batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface,
if (bat_priv->algo_ops->neigh.hardif_init)
bat_priv->algo_ops->neigh.hardif_init(hardif_neigh);
- hlist_add_head(&hardif_neigh->list, &hard_iface->neigh_list);
+ hlist_add_head_rcu(&hardif_neigh->list, &hard_iface->neigh_list);
out:
spin_unlock_bh(&hard_iface->neigh_list_lock);
--
2.10.1
next prev parent reply other threads:[~2016-10-26 15:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-26 15:55 [PATCH 0/3] pull request for net: batman-adv 2016-10-26 Simon Wunderlich
[not found] ` <20161026155515.18075-1-sw-2YrNx6rUIHYiY0qSoAWiAoQuADTiUCJX@public.gmane.org>
2016-10-26 15:55 ` Simon Wunderlich [this message]
2016-10-26 15:55 ` [PATCH 2/3] batman-adv: Add BATADV_DBG_TP_METER to BATADV_DBG_ALL Simon Wunderlich
2016-10-26 15:55 ` [PATCH 3/3] batman-adv: fix splat on disabling an interface Simon Wunderlich
2016-10-29 19:06 ` [PATCH 0/3] pull request for net: batman-adv 2016-10-26 David Miller
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