From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 18 Jan 2011 07:46:52 +0000 (+0000)
Subject: net: filter: dont block softirqs in sk_run_filter()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=80f8f1027b99660897bdeaeae73002185d829906;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

net: filter: dont block softirqs in sk_run_filter()

Packet filter (BPF) doesnt need to disable softirqs, being fully
re-entrant and lock-less.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/net/sock.h b/include/net/sock.h
index d884d268c704..ba6465bf7c7a 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1189,7 +1189,7 @@ extern void sk_filter_release_rcu(struct rcu_head *rcu);
 static inline void sk_filter_release(struct sk_filter *fp)
 {
 	if (atomic_dec_and_test(&fp->refcnt))
-		call_rcu_bh(&fp->rcu, sk_filter_release_rcu);
+		call_rcu(&fp->rcu, sk_filter_release_rcu);
 }
 
 static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
diff --git a/net/core/filter.c b/net/core/filter.c
index afc58374ca96..232b1873bb28 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -142,14 +142,14 @@ int sk_filter(struct sock *sk, struct sk_buff *skb)
 	if (err)
 		return err;
 
-	rcu_read_lock_bh();
-	filter = rcu_dereference_bh(sk->sk_filter);
+	rcu_read_lock();
+	filter = rcu_dereference(sk->sk_filter);
 	if (filter) {
 		unsigned int pkt_len = sk_run_filter(skb, filter->insns);
 
 		err = pkt_len ? pskb_trim(skb, pkt_len) : -EPERM;
 	}
-	rcu_read_unlock_bh();
+	rcu_read_unlock();
 
 	return err;
 }
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 91cb1d71f018..c3fc7b70a879 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -523,11 +523,11 @@ static inline unsigned int run_filter(const struct sk_buff *skb,
 {
 	struct sk_filter *filter;
 
-	rcu_read_lock_bh();
-	filter = rcu_dereference_bh(sk->sk_filter);
+	rcu_read_lock();
+	filter = rcu_dereference(sk->sk_filter);
 	if (filter != NULL)
 		res = sk_run_filter(skb, filter->insns);
-	rcu_read_unlock_bh();
+	rcu_read_unlock();
 
 	return res;
 }