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-rw-r--r--net/rxrpc/ar-skbuff.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/rxrpc/ar-skbuff.c b/net/rxrpc/ar-skbuff.c
index de755e04d29c..af9f4fd2a365 100644
--- a/net/rxrpc/ar-skbuff.c
+++ b/net/rxrpc/ar-skbuff.c
@@ -83,6 +83,11 @@ static void rxrpc_hard_ACK_data(struct rxrpc_call *call,
rxrpc_request_final_ACK(call);
} else if (atomic_dec_and_test(&call->ackr_not_idle) &&
test_and_clear_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags)) {
+ /* We previously soft-ACK'd some received packets that have now
+ * been consumed, so send a hard-ACK if no more packets are
+ * immediately forthcoming to allow the transmitter to free up
+ * its Tx bufferage.
+ */
_debug("send Rx idle ACK");
__rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, sp->hdr.serial,
true);
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