From a7ec2512ad7b23340059f59f3fd710cab056791a Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 6 Feb 2024 14:42:59 +0000 Subject: [PATCH] nexthop: convert nexthop_net_exit_batch to exit_batch_rtnl method exit_batch_rtnl() is called while RTNL is held. This saves one rtnl_lock()/rtnl_unlock() pair. We also need to create nexthop_net_exit() to make sure net->nexthop.devhash is not freed too soon, otherwise we will not be able to unregister netdev from exit_batch_rtnl() methods. Signed-off-by: Eric Dumazet Reviewed-by: David Ahern Reviewed-by: Antoine Tenart Link: https://lore.kernel.org/r/20240206144313.2050392-4-edumazet@google.com Signed-off-by: Jakub Kicinski --- net/ipv4/nexthop.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c index bbff68b5b5d4a..7270a8631406c 100644 --- a/net/ipv4/nexthop.c +++ b/net/ipv4/nexthop.c @@ -3737,16 +3737,20 @@ out: } EXPORT_SYMBOL(nexthop_res_grp_activity_update); -static void __net_exit nexthop_net_exit_batch(struct list_head *net_list) +static void __net_exit nexthop_net_exit_batch_rtnl(struct list_head *net_list, + struct list_head *dev_to_kill) { struct net *net; - rtnl_lock(); - list_for_each_entry(net, net_list, exit_list) { + ASSERT_RTNL(); + list_for_each_entry(net, net_list, exit_list) flush_all_nexthops(net); - kfree(net->nexthop.devhash); - } - rtnl_unlock(); +} + +static void __net_exit nexthop_net_exit(struct net *net) +{ + kfree(net->nexthop.devhash); + net->nexthop.devhash = NULL; } static int __net_init nexthop_net_init(struct net *net) @@ -3764,7 +3768,8 @@ static int __net_init nexthop_net_init(struct net *net) static struct pernet_operations nexthop_net_ops = { .init = nexthop_net_init, - .exit_batch = nexthop_net_exit_batch, + .exit = nexthop_net_exit, + .exit_batch_rtnl = nexthop_net_exit_batch_rtnl, }; static int __init nexthop_init(void) -- 2.30.2