Implement delete function that is required to delete actions without
holding rtnl lock. Use action API function that atomically deletes action
only if it is still in action idr. This implementation prevents concurrent
threads from deleting same action twice.

Signed-off-by: Vlad Buslov <redacted>
---
net/sched/act_bpf.c        |  8 ++++++++
net/sched/act_connmark.c   |  8 ++++++++
net/sched/act_csum.c       |  8 ++++++++
net/sched/act_gact.c       |  8 ++++++++
net/sched/act_ife.c        |  8 ++++++++
net/sched/act_ipt.c        | 16 ++++++++++++++++
net/sched/act_mirred.c     |  8 ++++++++
net/sched/act_nat.c        |  8 ++++++++
net/sched/act_pedit.c      |  8 ++++++++
net/sched/act_police.c     |  8 ++++++++
net/sched/act_sample.c     |  8 ++++++++
net/sched/act_simple.c     |  8 ++++++++
net/sched/act_skbedit.c    |  8 ++++++++
net/sched/act_skbmod.c     |  8 ++++++++
net/sched/act_tunnel_key.c |  8 ++++++++
net/sched/act_vlan.c       |  8 ++++++++
16 files changed, 136 insertions(+)

diff --git a/net/sched/act_bpf.c b/net/sched/act_bpf.c
index 0bf4ecf..36f7f66 100644
--- a/net/sched/act_bpf.c
+++ b/net/sched/act_bpf.c

@@ -394,6 +394,13 @@ static int tcf_bpf_search(struct net *net, struct tc_action **a, u32 index,

	return tcf_idr_search(tn, a, index);
}

+static int tcf_bpf_delete(struct net *net, u32 index)
+{
+	struct tc_action_net *tn = net_generic(net, bpf_net_id);
+
+	return tcf_idr_find_delete(tn, index);
+}
+
static struct tc_action_ops act_bpf_ops __read_mostly = {
	.kind		=	"bpf",
	.type		=	TCA_ACT_BPF,

@@ -404,6 +411,7 @@ static struct tc_action_ops act_bpf_ops __read_mostly = {

	.init		=	tcf_bpf_init,
	.walk		=	tcf_bpf_walker,
	.lookup		=	tcf_bpf_search,
+	.delete		=	tcf_bpf_delete,