linux-kernel - [PATCH net-next 4/5] net: ipa: update channel in gsi_channel_trans

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Date:   Tue,  6 Sep 2022 12:19:41 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     mka@...omium.org, evgreen@...omium.org, bjorn.andersson@...aro.org,
        quic_cpratapa@...cinc.com, quic_avuyyuru@...cinc.com,
        quic_jponduru@...cinc.com, quic_subashab@...cinc.com,
        elder@...nel.org, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 4/5] net: ipa: update channel in gsi_channel_trans_complete()

Have gsi_channel_trans_complete() update the known state from
hardware rather than doing so in gsi_channel_poll_one().

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/gsi.c         | 5 +----
 drivers/net/ipa/gsi_private.h | 8 ++++++++
 drivers/net/ipa/gsi_trans.c   | 2 +-
 3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 16df699009a86..5471843b665fc 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -1475,7 +1475,7 @@ void gsi_channel_doorbell(struct gsi_channel *channel)
 }
 
 /* Consult hardware, move any newly completed transactions to completed list */
-static struct gsi_trans *gsi_channel_update(struct gsi_channel *channel)
+struct gsi_trans *gsi_channel_update(struct gsi_channel *channel)
 {
 	u32 evt_ring_id = channel->evt_ring_id;
 	struct gsi *gsi = channel->gsi;
@@ -1529,9 +1529,6 @@ static struct gsi_trans *gsi_channel_poll_one(struct gsi_channel *channel)
 
 	/* Get the first transaction from the completed list */
 	trans = gsi_channel_trans_complete(channel);
-	if (!trans)	/* List is empty; see if there's more to do */
-		trans = gsi_channel_update(channel);
-
 	if (trans)
 		gsi_trans_move_polled(trans);
 
diff --git a/drivers/net/ipa/gsi_private.h b/drivers/net/ipa/gsi_private.h
index 0b2516fa21b5d..a937811bb1bb7 100644
--- a/drivers/net/ipa/gsi_private.h
+++ b/drivers/net/ipa/gsi_private.h
@@ -94,6 +94,14 @@ void gsi_channel_trans_exit(struct gsi_channel *channel);
  */
 void gsi_channel_doorbell(struct gsi_channel *channel);
 
+/* gsi_channel_update() - Update knowledge of channel hardware state
+ * @channel:	Channel whose doorbell should be rung
+ *
+ * Consult hardware, move any newly completed transactions to a
+ * channel's completed list
+ */
+struct gsi_trans *gsi_channel_update(struct gsi_channel *channel);
+
 /**
  * gsi_ring_virt() - Return virtual address for a ring entry
  * @ring:	Ring whose address is to be translated
diff --git a/drivers/net/ipa/gsi_trans.c b/drivers/net/ipa/gsi_trans.c
index a3ae0ca4813c6..0b78ae904bacf 100644
--- a/drivers/net/ipa/gsi_trans.c
+++ b/drivers/net/ipa/gsi_trans.c
@@ -241,7 +241,7 @@ struct gsi_trans *gsi_channel_trans_complete(struct gsi_channel *channel)
 	u16 trans_id = trans_info->completed_id;
 
 	if (trans_id == trans_info->pending_id)
-		return NULL;
+		return gsi_channel_update(channel);
 
 	return &trans_info->trans[trans_id %= channel->tre_count];
 }
-- 
2.34.1