tcp: do not block bh during prequeue processing

AFAIK, nothing in current TCP stack absolutely wants BH
being disabled once socket is owned by a thread running in
process context.

As mentioned in my prior patch ("tcp: give prequeue mode some care"),
processing a batch of packets might take time, better not block BH
at all.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 4 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index b24c6ed4a04f..4787f86ae64c 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1449,12 +1449,8 @@ static void tcp_prequeue_process(struct sock *sk)
 
         NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPPREQUEUED);
 
-        /* RX process wants to run with disabled BHs, though it is not
-         * necessary */
-        local_bh_disable();
         while ((skb = __skb_dequeue(&tp->ucopy.prequeue)) != NULL)
                 sk_backlog_rcv(sk, skb);
-        local_bh_enable();
 
         /* Clear memory counter. */
         tp->ucopy.memory = 0;