From 8ec609d8b561468691b60347ff594bd443ea58c0 Mon Sep 17 00:00:00 2001 From: Pravin B Shelar Date: Tue, 11 Nov 2014 15:55:16 -0800 Subject: [PATCH] openvswitch: Convert dp rcu read operation to locked operations dp read operations depends on ovs_dp_cmd_fill_info(). This API needs to looup vport to find dp name, but vport lookup can fail. Therefore to keep vport reference alive we need to take ovs lock. Introduced by commit 6093ae9abac1 ("openvswitch: Minimize dp and vport critical sections"). Signed-off-by: Pravin B Shelar Acked-by: Andy Zhou --- net/openvswitch/datapath.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index e6d7255..f9e556b 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -1265,7 +1265,7 @@ static size_t ovs_dp_cmd_msg_size(void) return msgsize; } -/* Called with ovs_mutex or RCU read lock. */ +/* Called with ovs_mutex. */ static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, u32 portid, u32 seq, u32 flags, u8 cmd) { @@ -1555,7 +1555,7 @@ static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) if (!reply) return -ENOMEM; - rcu_read_lock(); + ovs_lock(); dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); if (IS_ERR(dp)) { err = PTR_ERR(dp); @@ -1564,12 +1564,12 @@ static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, info->snd_seq, 0, OVS_DP_CMD_NEW); BUG_ON(err < 0); - rcu_read_unlock(); + ovs_unlock(); return genlmsg_reply(reply, info); err_unlock_free: - rcu_read_unlock(); + ovs_unlock(); kfree_skb(reply); return err; } @@ -1581,8 +1581,8 @@ static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) int skip = cb->args[0]; int i = 0; - rcu_read_lock(); - list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) { + ovs_lock(); + list_for_each_entry(dp, &ovs_net->dps, list_node) { if (i >= skip && ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, NLM_F_MULTI, @@ -1590,7 +1590,7 @@ static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) break; i++; } - rcu_read_unlock(); + ovs_unlock(); cb->args[0] = i; -- 2.7.4