tree b00f2e4b7fd1940436fa8dfc2f037cc7ed8fdcc4
parent 296739839fa2851e6badc77dcfc45050094cb102
author David Howells <dhowells@redhat.com> 1489132129 +0000
committer David S. Miller <davem@davemloft.net> 1489167263 -0800

rxrpc: Wake up the transmitter if Rx window size increases on the peer

The RxRPC ACK packet may contain an extension that includes the peer's
current Rx window size for this call.  We adjust the local Tx window size
to match.  However, the transmitter can stall if the receive window is
reduced to 0 by the peer and then reopened.

This is because the normal way that the transmitter is re-energised is by
dropping something out of our Tx queue and thus making space.  When a
single gap is made, the transmitter is woken up.  However, because there's
nothing in the Tx queue at this point, this doesn't happen.

To fix this, perform a wake_up() any time we see the peer's Rx window size
increasing.

The observable symptom is that calls start failing on ETIMEDOUT and the
following:

	kAFS: SERVER DEAD state=-62

appears in dmesg.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>