net: ipa: simplify endpoint transaction completion

When a GSI transaction completes, ipa_endpoint_trans_complete() is
eventually called.  That handles TX and RX completions separately,
but ipa_endpoint_tx_complete() is a no-op.

Instead, have ipa_endpoint_trans_complete() return immediately for a
TX transaction, and incorporate code from ipa_endpoint_rx_complete()
to handle RX transactions.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ipa/ipa_endpoint.c

@@ -1368,18 +1368,14 @@ static void ipa_endpoint_status_parse(struct ipa_endpoint *endpoint,
 	}
 }
 
-/* Complete a TX transaction, command or from ipa_endpoint_skb_tx() */
-static void ipa_endpoint_tx_complete(struct ipa_endpoint *endpoint,
-				     struct gsi_trans *trans)
-{
-}
-
-/* Complete transaction initiated in ipa_endpoint_replenish_one() */
-static void ipa_endpoint_rx_complete(struct ipa_endpoint *endpoint,
+void ipa_endpoint_trans_complete(struct ipa_endpoint *endpoint,
 				 struct gsi_trans *trans)
 {
 	struct page *page;
 
+	if (endpoint->toward_ipa)
+		return;
+
 	if (trans->cancelled)
 		goto done;
 
@@ -1393,15 +1389,6 @@ static void ipa_endpoint_rx_complete(struct ipa_endpoint *endpoint,
 	ipa_endpoint_replenish(endpoint);
 }
 
-void ipa_endpoint_trans_complete(struct ipa_endpoint *endpoint,
-				 struct gsi_trans *trans)
-{
-	if (endpoint->toward_ipa)
-		ipa_endpoint_tx_complete(endpoint, trans);
-	else
-		ipa_endpoint_rx_complete(endpoint, trans);
-}
-
 void ipa_endpoint_trans_release(struct ipa_endpoint *endpoint,
 				struct gsi_trans *trans)
 {