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 <dhowells@redhat.com>
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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();