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net: percpu_counter_inc() should not be called in BH-disabled section 

Based upon a lockdep report by Alexey Dobriyan.

I checked all per_cpu_counter_xxx() usages in network tree, and I
think all call sites are BH enabled except one in
inet_csk_listen_stop().

commit dd24c00191
(net: Use a percpu_counter for orphan_count)
replaced atomic_t orphan_count to a percpu_counter.

atomic_inc()/atomic_dec() can be called from any context, while
percpu_counter_xxx() should be called from a consistent state.

For orphan_count, this context can be the BH-enabled one.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2008-12-01 23:37:17 -08:00 committed by David S. Miller
parent 422d9cdcb8
commit 6976a1d6c2
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/inet_connection_sock.c
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@ -632,6 +632,8 @@ void inet_csk_listen_stop(struct sock *sk)
acc_req = req->dl_next;
percpu_counter_inc(sk->sk_prot->orphan_count);
local_bh_disable();
bh_lock_sock(child);
WARN_ON(sock_owned_by_user(child));
@ -641,8 +643,6 @@ void inet_csk_listen_stop(struct sock *sk)
sock_orphan(child);
percpu_counter_inc(sk->sk_prot->orphan_count);
inet_csk_destroy_sock(child);
bh_unlock_sock(child);