net: sched: Change the block's chain list to an rcu list

To allow lookup of a block's chain under atomic context.

Co-developed-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index bbd8b5e..a634c85 100644 (file)
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -22,6 +22,7 @@
 #include <linux/idr.h>
 #include <linux/rhashtable.h>
 #include <linux/jhash.h>
+#include <linux/rculist.h>
 #include <net/net_namespace.h>
 #include <net/sock.h>
 #include <net/netlink.h>
@@ -354,7 +355,7 @@ static struct tcf_chain *tcf_chain_create(struct tcf_block *block,
        chain = kzalloc(sizeof(*chain), GFP_KERNEL);
        if (!chain)
                return NULL;
-       list_add_tail(&chain->list, &block->chain_list);
+       list_add_tail_rcu(&chain->list, &block->chain_list);
        mutex_init(&chain->filter_chain_lock);
        chain->block = block;
        chain->index = chain_index;
@@ -394,7 +395,7 @@ static bool tcf_chain_detach(struct tcf_chain *chain)
 
        ASSERT_BLOCK_LOCKED(block);
 
-       list_del(&chain->list);
+       list_del_rcu(&chain->list);
        if (!chain->index)
                block->chain0.chain = NULL;