From b86e218e0d422488e0febb07620fa97ae9713779 Mon Sep 17 00:00:00 2001 From: David Howells Date: Fri, 23 Sep 2016 15:08:48 +0100 Subject: [PATCH] rxrpc: Don't call the tx_ack tracepoint if don't generate an ACK rxrpc_send_call_packet() is invoking the tx_ack tracepoint before it checks whether there's an ACK to transmit (another thread may jump in and transmit it). Fix this by only invoking the tracepoint if we get a valid ACK to transmit. Further, only allocate a serial number if we're going to actually transmit something. Signed-off-by: David Howells --- net/rxrpc/output.c | 26 +++++++++++--------------- 1 file changed, 11 insertions(+), 15 deletions(-) diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c index 282cb1e..5c1e008 100644 --- a/net/rxrpc/output.c +++ b/net/rxrpc/output.c @@ -80,9 +80,6 @@ static size_t rxrpc_fill_out_ack(struct rxrpc_call *call, pkt->ackinfo.rwind = htonl(call->rx_winsize); pkt->ackinfo.jumbo_max = htonl(jmax); - trace_rxrpc_tx_ack(call, hard_ack + 1, serial, call->ackr_reason, - top - hard_ack); - *ackp++ = 0; *ackp++ = 0; *ackp++ = 0; @@ -119,8 +116,6 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type) return -ENOMEM; } - serial = atomic_inc_return(&conn->serial); - msg.msg_name = &call->peer->srx.transport; msg.msg_namelen = call->peer->srx.transport_len; msg.msg_control = NULL; @@ -131,7 +126,6 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type) pkt->whdr.cid = htonl(call->cid); pkt->whdr.callNumber = htonl(call->call_id); pkt->whdr.seq = 0; - pkt->whdr.serial = htonl(serial); pkt->whdr.type = type; pkt->whdr.flags = conn->out_clientflag; pkt->whdr.userStatus = 0; @@ -157,14 +151,6 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type) spin_unlock_bh(&call->lock); - _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", - serial, - ntohs(pkt->ack.maxSkew), - ntohl(pkt->ack.firstPacket), - ntohl(pkt->ack.previousPacket), - ntohl(pkt->ack.serial), - rxrpc_acks(pkt->ack.reason), - pkt->ack.nAcks); iov[0].iov_len += sizeof(pkt->ack) + n; iov[1].iov_base = &pkt->ackinfo; @@ -176,7 +162,6 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type) case RXRPC_PACKET_TYPE_ABORT: abort_code = call->abort_code; pkt->abort_code = htonl(abort_code); - _proto("Tx ABORT %%%u { %d }", serial, abort_code); iov[0].iov_len += sizeof(pkt->abort_code); len += sizeof(pkt->abort_code); ioc = 1; @@ -188,6 +173,17 @@ int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type) goto out; } + serial = atomic_inc_return(&conn->serial); + pkt->whdr.serial = htonl(serial); + switch (type) { + case RXRPC_PACKET_TYPE_ACK: + trace_rxrpc_tx_ack(call, + ntohl(pkt->ack.firstPacket), + ntohl(pkt->ack.serial), + pkt->ack.reason, pkt->ack.nAcks); + break; + } + if (ping) { call->ackr_ping = serial; smp_wmb(); -- 2.7.4