net: ipa: pass GSI pointer to gsi_evt_ring_rx_update()

The only reason the event ring's channel pointer is needed in
gsi_evt_ring_rx_update() is so we can get at its GSI pointer.

We can pass the GSI pointer as an argument, along with the event
ring ID, and thereby avoid using the event ring channel pointer.
This is another step toward no longer assuming an event ring
services a single channel.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/gsi.c

@@ -1345,8 +1345,9 @@ gsi_event_trans(struct gsi *gsi, struct gsi_event *event)
 
 /**
  * gsi_evt_ring_rx_update() - Record lengths of received data
- * @evt_ring:	Event ring associated with channel that received packets
- * @index:	Event index in ring reported by hardware
+ * @gsi:		GSI pointer
+ * @evt_ring_id:	Event ring ID
+ * @index:		Event index in ring reported by hardware
  *
  * Events for RX channels contain the actual number of bytes received into
  * the buffer.  Every event has a transaction associated with it, and here
@@ -1362,9 +1363,9 @@ gsi_event_trans(struct gsi *gsi, struct gsi_event *event)
  *
  * Note that @index always refers to an element *within* the event ring.
  */
-static void gsi_evt_ring_rx_update(struct gsi_evt_ring *evt_ring, u32 index)
+static void gsi_evt_ring_rx_update(struct gsi *gsi, u32 evt_ring_id, u32 index)
 {
-	struct gsi_channel *channel = evt_ring->channel;
+	struct gsi_evt_ring *evt_ring = &gsi->evt_ring[evt_ring_id];
 	struct gsi_ring *ring = &evt_ring->ring;
 	struct gsi_event *event_done;
 	struct gsi_event *event;
@@ -1387,7 +1388,7 @@ static void gsi_evt_ring_rx_update(struct gsi_evt_ring *evt_ring, u32 index)
 	do {
 		struct gsi_trans *trans;
 
-		trans = gsi_event_trans(channel->gsi, event);
+		trans = gsi_event_trans(gsi, event);
 		if (!trans)
 			return;
 
@@ -1500,7 +1501,7 @@ static struct gsi_trans *gsi_channel_update(struct gsi_channel *channel)
 	if (channel->toward_ipa)
 		gsi_trans_tx_completed(trans);
 	else
-		gsi_evt_ring_rx_update(evt_ring, index);
+		gsi_evt_ring_rx_update(gsi, evt_ring_id, index);
 
 	gsi_trans_move_complete(trans);