linux-kernel - [PATCH net-next 6/6] net: ipa: don't pass size to ipa_cmd_transfer

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Message-Id: <20210125212947.17097-7-elder@linaro.org>
Date:   Mon, 25 Jan 2021 15:29:47 -0600
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     elder@...nel.org, evgreen@...omium.org, bjorn.andersson@...aro.org,
        cpratapa@...eaurora.org, subashab@...eaurora.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 6/6] net: ipa: don't pass size to ipa_cmd_transfer_add()

The only time we transfer data (rather than issuing a command) out
of the AP->command TX endpoint is when we're clearing the hardware
pipeline.  All that's needed is a "small" data buffer, and its
contents aren't even important.

For convenience, we just transfer a command structure in this case
(it's already mapped for DMA).  The TRE is added to a transaction
using ipa_cmd_ip_tag_status_add(), but we ignore the size value
provided to that function.  So just get rid of the size argument.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_cmd.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index eb50e7437359a..97b50fee60089 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -550,7 +550,7 @@ static void ipa_cmd_ip_tag_status_add(struct gsi_trans *trans)
 }
 
 /* Issue a small command TX data transfer */
-static void ipa_cmd_transfer_add(struct gsi_trans *trans, u16 size)
+static void ipa_cmd_transfer_add(struct gsi_trans *trans)
 {
 	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
 	enum dma_data_direction direction = DMA_TO_DEVICE;
@@ -558,8 +558,6 @@ static void ipa_cmd_transfer_add(struct gsi_trans *trans, u16 size)
 	union ipa_cmd_payload *payload;
 	dma_addr_t payload_addr;
 
-	/* assert(size <= sizeof(*payload)); */
-
 	/* Just transfer a zero-filled payload structure */
 	payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
 
@@ -590,7 +588,7 @@ void ipa_cmd_pipeline_clear_add(struct gsi_trans *trans)
 	endpoint = ipa->name_map[IPA_ENDPOINT_AP_LAN_RX];
 	ipa_cmd_ip_packet_init_add(trans, endpoint->endpoint_id);
 	ipa_cmd_ip_tag_status_add(trans);
-	ipa_cmd_transfer_add(trans, 4);
+	ipa_cmd_transfer_add(trans);
 }
 
 /* Returns the number of commands required to clear the pipeline */
-- 
2.20.1