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authorEric Dumazet <edumazet@google.com>2015-07-06 05:18:07 -0700
committerDavid S. Miller <davem@davemloft.net>2015-07-08 13:50:42 -0700
commit8f2ae965b7ef4f4ddab6110f06388e270723d694 (patch)
treea9eab96bbfdf0be97e2d78a165edcdc769d5ca08 /net/sched
parentcc6510a9504fd3c03d76bd68d99653148342eecc (diff)
downloadlinux-8f2ae965b7ef4f4ddab6110f06388e270723d694.tar.gz
net_sched: act_gact: read tcfg_ptype once
Third step for gact RCU operation :

Following patch will get rid of spinlock protection,
so we need to read tcfg_ptype once.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/act_gact.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c
index 2f9bec584b3f..e4eb88d3d8dc 100644
--- a/net/sched/act_gact.c
+++ b/net/sched/act_gact.c
@@ -127,16 +127,16 @@ static int tcf_gact(struct sk_buff *skb, const struct tc_action *a,
 		    struct tcf_result *res)
 {
 	struct tcf_gact *gact = a->priv;
-	int action = TC_ACT_SHOT;
+	int action = gact->tcf_action;
 
 	spin_lock(&gact->tcf_lock);
 #ifdef CONFIG_GACT_PROB
-	if (gact->tcfg_ptype)
-		action = gact_rand[gact->tcfg_ptype](gact);
-	else
-		action = gact->tcf_action;
-#else
-	action = gact->tcf_action;
+	{
+	u32 ptype = READ_ONCE(gact->tcfg_ptype);
+
+	if (ptype)
+		action = gact_rand[ptype](gact);
+	}
 #endif
 	gact->tcf_bstats.bytes += qdisc_pkt_len(skb);
 	gact->tcf_bstats.packets++;