linux-kernel - [PATCH V2 net-next] net: fec: remove last_bdp from fec_enet_txq_xmit

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Date:   Mon, 29 May 2023 10:26:15 +0800
From:   wei.fang@....com
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, shenwei.wang@....com, xiaoning.wang@....com,
        simon.horman@...igine.com, netdev@...r.kernel.org
Cc:     linux-imx@....com, linux-kernel@...r.kernel.org
Subject: [PATCH V2 net-next] net: fec: remove last_bdp from fec_enet_txq_xmit_frame()

From: Wei Fang <wei.fang@....com>

The last_bdp is initialized to bdp, and both last_bdp and bdp are
not changed. That is to say that last_bdp and bdp are always equal.
So bdp can be used directly.

Signed-off-by: Wei Fang <wei.fang@....com>
---
V2 change:
Refine the commit message to make it more clear which is suggested
by Simon Horman.
---
 drivers/net/ethernet/freescale/fec_main.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 632bb4d589d7..4d37a811ae15 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -3770,7 +3770,7 @@ static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep,
 				   struct xdp_frame *frame)
 {
 	unsigned int index, status, estatus;
-	struct bufdesc *bdp, *last_bdp;
+	struct bufdesc *bdp;
 	dma_addr_t dma_addr;
 	int entries_free;
 
@@ -3782,7 +3782,6 @@ static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep,
 
 	/* Fill in a Tx ring entry */
 	bdp = txq->bd.cur;
-	last_bdp = bdp;
 	status = fec16_to_cpu(bdp->cbd_sc);
 	status &= ~BD_ENET_TX_STATS;
 
@@ -3810,7 +3809,6 @@ static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep,
 		ebdp->cbd_esc = cpu_to_fec32(estatus);
 	}
 
-	index = fec_enet_get_bd_index(last_bdp, &txq->bd);
 	txq->tx_skbuff[index] = NULL;
 
 	/* Make sure the updates to rest of the descriptor are performed before
@@ -3825,7 +3823,7 @@ static int fec_enet_txq_xmit_frame(struct fec_enet_private *fep,
 	bdp->cbd_sc = cpu_to_fec16(status);
 
 	/* If this was the last BD in the ring, start at the beginning again. */
-	bdp = fec_enet_get_nextdesc(last_bdp, &txq->bd);
+	bdp = fec_enet_get_nextdesc(bdp, &txq->bd);
 
 	/* Make sure the update to bdp are performed before txq->bd.cur. */
 	dma_wmb();
-- 
2.25.1