commit b86e218e0d422488e0febb07620fa97ae9713779
author David Howells <dhowells@redhat.com> Fri Sep 23 15:08:48 2016 +0100
committer David Howells <dhowells@redhat.com> Fri Sep 23 15:49:19 2016 +0100
tree 63a7f035d1a922a377754a6ea9781ac748226c9a
parent 70790dbe3f6651fb66ad38da0a1e24368778bc16

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>