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rxrpc: Fix accidental cancellation of scheduled resend by ACK parser

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When rxrpc_input_soft_acks() is parsing the soft-ACKs from an ACK packet,
it updates the Tx packet annotations in the annotation buffer.  If a
soft-ACK is an ACK, then we overwrite unack'd, nak'd or to-be-retransmitted
states and that is fine; but if the soft-ACK is an NACK, we overwrite the
to-be-retransmitted with a nak - which isn't.

Instead, we need to let any scheduled retransmission stand if the packet
was NAK'd.

Note that we don't reissue a resend if the annotation is in the
to-be-retransmitted state because someone else must've scheduled the
resend already.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2016-09-23 12:39:23 +01:00
parent dfc3da4404
commit be8aa33806
1 changed files with 2 additions and 0 deletions
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2
net/rxrpc/input.c
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@ -479,6 +479,8 @@ static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks,
case RXRPC_ACK_TYPE_NACK:
if (anno_type == RXRPC_TX_ANNO_NAK)
continue;
if (anno_type == RXRPC_TX_ANNO_RETRANS)
continue;
call->rxtx_annotations[ix] =
RXRPC_TX_ANNO_NAK | annotation;
resend = true;