net: remove bh disabling around percpu_counter accesses

Shaohua Li made percpu_counter irq safe in commit 098faf5805c8
("percpu_counter: make APIs irq safe")

We can safely remove BH disable/enable sections around various
percpu_counter manipulations.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 3 insertions, 23 deletions

diff --git a/include/net/dst_ops.h b/include/net/dst_ops.h
index a0d443ca16fc..8a2b66d8d78d 100644
--- a/include/net/dst_ops.h
+++ b/include/net/dst_ops.h
@@ -46,19 +46,12 @@ static inline int dst_entries_get_fast(struct dst_ops *dst)
 
 static inline int dst_entries_get_slow(struct dst_ops *dst)
 {
-        int res;
-
-        local_bh_disable();
-        res = percpu_counter_sum_positive(&dst->pcpuc_entries);
-        local_bh_enable();
-        return res;
+        return percpu_counter_sum_positive(&dst->pcpuc_entries);
 }
 
 static inline void dst_entries_add(struct dst_ops *dst, int val)
 {
-        local_bh_disable();
         percpu_counter_add(&dst->pcpuc_entries, val);
-        local_bh_enable();
 }
 
 static inline int dst_entries_init(struct dst_ops *dst)
diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 909972aa3acd..5894730ec82a 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -164,13 +164,7 @@ static inline void add_frag_mem_limit(struct netns_frags *nf, int i)
 
 static inline unsigned int sum_frag_mem_limit(struct netns_frags *nf)
 {
-        unsigned int res;
-
-        local_bh_disable();
-        res = percpu_counter_sum_positive(&nf->mem);
-        local_bh_enable();
-
-        return res;
+        return percpu_counter_sum_positive(&nf->mem);
 }
 
 /* RFC 3168 support :
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 096a085611ab..c7f7c5335369 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -836,9 +836,8 @@ void inet_csk_destroy_sock(struct sock *sk)
 
         sk_refcnt_debug_release(sk);
 
-        local_bh_disable();
         percpu_counter_dec(sk->sk_prot->orphan_count);
-        local_bh_enable();
+
         sock_put(sk);
 }
 EXPORT_SYMBOL(inet_csk_destroy_sock);
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 0247ca032232..a9deeb90dd36 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -57,10 +57,8 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
         unsigned int frag_mem;
         int orphans, sockets;
 
-        local_bh_disable();
         orphans = percpu_counter_sum_positive(&tcp_orphan_count);
         sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
-        local_bh_enable();
 
         socket_seq_show(seq);
         seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index aba6ea76338e..c43eb1a831d7 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -420,9 +420,7 @@ void tcp_init_sock(struct sock *sk)
         sk->sk_sndbuf = sysctl_tcp_wmem[1];
         sk->sk_rcvbuf = sysctl_tcp_rmem[1];
 
-        local_bh_disable();
         sk_sockets_allocated_inc(sk);
-        local_bh_enable();
 }
 EXPORT_SYMBOL(tcp_init_sock);
 
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 3644fc117691..f7325b25b06e 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1887,9 +1887,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
         tcp_free_fastopen_req(tp);
         tcp_saved_syn_free(tp);
 
-        local_bh_disable();
         sk_sockets_allocated_dec(sk);
-        local_bh_enable();
 }
 EXPORT_SYMBOL(tcp_v4_destroy_sock);