linux-kernel - [PATCH 3/7] rxrpc: Don't try to resend the request if we're receiving the reply

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Message-ID: <165295799330.3423686.13127473766739593413.stgit@warthog.procyon.org.uk>
Date:   Thu, 19 May 2022 11:59:53 +0100
From:   David Howells <dhowells@...hat.com>
To:     marc.dionne@...istor.com
Cc:     dhowells@...hat.com, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/7] rxrpc: Don't try to resend the request if we're receiving
 the reply

rxrpc has a timer to trigger resending of unacked data packets in a call.
This is not cancelled when a client call switches to the receive phase on
the basis that most calls don't last long enough for it to ever expire.
However, if it *does* expire after we've started to receive the reply, we
shouldn't then go into trying to retransmit or pinging the server to find
out if an ack got lost.

Fix this by skipping the resend code if we're into receiving the reply to a
client call.

Fixes: 17926a79320a ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both")
Signed-off-by: David Howells <dhowells@...hat.com>
cc: linux-afs@...ts.infradead.org
---

 net/rxrpc/call_event.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index 22e05de5d1ca..31761084a76f 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -406,7 +406,8 @@ void rxrpc_process_call(struct work_struct *work)
 		goto recheck_state;
 	}
 
-	if (test_and_clear_bit(RXRPC_CALL_EV_RESEND, &call->events)) {
+	if (test_and_clear_bit(RXRPC_CALL_EV_RESEND, &call->events) &&
+	    call->state != RXRPC_CALL_CLIENT_RECV_REPLY) {
 		rxrpc_resend(call, now);
 		goto recheck_state;
 	}