From 259e60f96785ab9043bb6eea5b90b354053f98cc Mon Sep 17 00:00:00 2001 From: Vlad Buslov Date: Thu, 21 Mar 2019 15:17:39 +0200 Subject: [PATCH] net: sched: flower: protect masks list with spinlock Protect modifications of flower masks list with spinlock to remove dependency on rtnl lock and allow concurrent access. Signed-off-by: Vlad Buslov Acked-by: Jiri Pirko Reviewed-by: Stefano Brivio Signed-off-by: David S. Miller --- net/sched/cls_flower.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c index 92478bb122d3..db47828ea5e2 100644 --- a/net/sched/cls_flower.c +++ b/net/sched/cls_flower.c @@ -88,6 +88,7 @@ struct fl_flow_tmplt { struct cls_fl_head { struct rhashtable ht; + spinlock_t masks_lock; /* Protect masks list */ struct list_head masks; struct rcu_work rwork; struct idr handle_idr; @@ -312,6 +313,7 @@ static int fl_init(struct tcf_proto *tp) if (!head) return -ENOBUFS; + spin_lock_init(&head->masks_lock); INIT_LIST_HEAD_RCU(&head->masks); rcu_assign_pointer(tp->root, head); idr_init(&head->handle_idr); @@ -341,7 +343,11 @@ static bool fl_mask_put(struct cls_fl_head *head, struct fl_flow_mask *mask, return false; rhashtable_remove_fast(&head->ht, &mask->ht_node, mask_ht_params); + + spin_lock(&head->masks_lock); list_del_rcu(&mask->list); + spin_unlock(&head->masks_lock); + if (async) tcf_queue_work(&mask->rwork, fl_mask_free_work); else @@ -1312,7 +1318,9 @@ static struct fl_flow_mask *fl_create_new_mask(struct cls_fl_head *head, /* Wait until any potential concurrent users of mask are finished */ synchronize_rcu(); + spin_lock(&head->masks_lock); list_add_tail_rcu(&newmask->list, &head->masks); + spin_unlock(&head->masks_lock); return newmask;