[ovs-dev] [PATCH V4 21/24] datapath: use hlist_for_each_entry_rcu instead of hlist_for_each_entry

Greg Rose gvrose8192 at gmail.com
Mon Oct 12 20:25:08 UTC 2020

From: Tonghao Zhang <xiangxia.m.yue at gmail.com>

Upstream commit:
    commit 64948427a63f49dd0ce403388d232f22cc1971a8
    Author: Tonghao Zhang <xiangxia.m.yue at gmail.com>
    Date:   Thu Mar 26 04:27:24 2020 +0800

    net: openvswitch: use hlist_for_each_entry_rcu instead of hlist_for_each_entry

    The struct sw_flow is protected by RCU, when traversing them,
    use hlist_for_each_entry_rcu.

    Signed-off-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
    Tested-by: Greg Rose <gvrose8192 at gmail.com>
    Reviewed-by: Greg Rose <gvrose8192 at gmail.com>
    Signed-off-by: David S. Miller <davem at davemloft.net>

Compat fixup - OVS doesn't support lockdep_ovsl_is_held() yet

Cc: Tonghao Zhang <xiangxia.m.yue at gmail.com>
Reviewed-by: Tonghao Zhang <xiangxia.m.yue at gmail.com>
Signed-off-by: Greg Rose <gvrose8192 at gmail.com>
 datapath/flow_table.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/datapath/flow_table.c b/datapath/flow_table.c
index bd05dd394..650338fb0 100644
--- a/datapath/flow_table.c
+++ b/datapath/flow_table.c
@@ -485,12 +485,12 @@ static void flow_table_copy_flows(struct table_instance *old,
 		struct hlist_head *head = &old->buckets[i];
 		if (ufid)
-			hlist_for_each_entry(flow, head,
-					     ufid_table.node[old_ver])
+			hlist_for_each_entry_rcu(flow, head,
+						 ufid_table.node[old_ver])
 				ufid_table_instance_insert(new, flow);
-			hlist_for_each_entry(flow, head,
-					     flow_table.node[old_ver])
+			hlist_for_each_entry_rcu(flow, head,
+						 flow_table.node[old_ver])
 				table_instance_insert(new, flow);

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