netdev - [PATCH v2 net-next 08/14] net: fec: remove unnecessary NULL pointer check when clearing TX BD ring

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Message-Id: <20260116074027.1603841-9-wei.fang@nxp.com>
Date: Fri, 16 Jan 2026 15:40:21 +0800
From: Wei Fang <wei.fang@....com>
To: shenwei.wang@....com,
	xiaoning.wang@....com,
	frank.li@....com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	ast@...nel.org,
	daniel@...earbox.net,
	hawk@...nel.org,
	john.fastabend@...il.com,
	sdf@...ichev.me
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev,
	bpf@...r.kernel.org
Subject: [PATCH v2 net-next 08/14] net: fec: remove unnecessary NULL pointer check when clearing TX BD ring

The tx_buf pointer will not NULL when its type is FEC_TXBUF_T_XDP_NDO or
FEC_TXBUF_T_XDP_TX. If the type is FEC_TXBUF_T_SKB, dev_kfree_skb_any()
will do NULL pointer check. So it is unnecessary to do NULL pointer check
in fec_enet_bd_init() and fec_enet_tx_queue().

Signed-off-by: Wei Fang <wei.fang@....com>
---
 drivers/net/ethernet/freescale/fec_main.c | 35 ++++++++---------------
 1 file changed, 12 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 52abeeb50dda..0e8947f163a8 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1032,24 +1032,19 @@ static void fec_enet_bd_init(struct net_device *dev)
 							 fec32_to_cpu(bdp->cbd_bufaddr),
 							 fec16_to_cpu(bdp->cbd_datlen),
 							 DMA_TO_DEVICE);
-				if (txq->tx_buf[i].buf_p)
-					dev_kfree_skb_any(txq->tx_buf[i].buf_p);
+				dev_kfree_skb_any(txq->tx_buf[i].buf_p);
 			} else if (txq->tx_buf[i].type == FEC_TXBUF_T_XDP_NDO) {
-				if (bdp->cbd_bufaddr)
-					dma_unmap_single(&fep->pdev->dev,
-							 fec32_to_cpu(bdp->cbd_bufaddr),
-							 fec16_to_cpu(bdp->cbd_datlen),
-							 DMA_TO_DEVICE);
+				dma_unmap_single(&fep->pdev->dev,
+						 fec32_to_cpu(bdp->cbd_bufaddr),
+						 fec16_to_cpu(bdp->cbd_datlen),
+						 DMA_TO_DEVICE);
 
-				if (txq->tx_buf[i].buf_p)
-					xdp_return_frame(txq->tx_buf[i].buf_p);
+				xdp_return_frame(txq->tx_buf[i].buf_p);
 			} else {
 				struct page *page = txq->tx_buf[i].buf_p;
 
-				if (page)
-					page_pool_put_page(pp_page_to_nmdesc(page)->pp,
-							   page, 0,
-							   false);
+				page_pool_put_page(pp_page_to_nmdesc(page)->pp,
+						   page, 0, false);
 			}
 
 			txq->tx_buf[i].buf_p = NULL;
@@ -1537,21 +1532,15 @@ fec_enet_tx_queue(struct net_device *ndev, u16 queue_id, int budget)
 
 			if (txq->tx_buf[index].type == FEC_TXBUF_T_XDP_NDO) {
 				xdpf = txq->tx_buf[index].buf_p;
-				if (bdp->cbd_bufaddr)
-					dma_unmap_single(&fep->pdev->dev,
-							 fec32_to_cpu(bdp->cbd_bufaddr),
-							 fec16_to_cpu(bdp->cbd_datlen),
-							 DMA_TO_DEVICE);
+				dma_unmap_single(&fep->pdev->dev,
+						 fec32_to_cpu(bdp->cbd_bufaddr),
+						 fec16_to_cpu(bdp->cbd_datlen),
+						 DMA_TO_DEVICE);
 			} else {
 				page = txq->tx_buf[index].buf_p;
 			}
 
 			bdp->cbd_bufaddr = cpu_to_fec32(0);
-			if (unlikely(!txq->tx_buf[index].buf_p)) {
-				txq->tx_buf[index].type = FEC_TXBUF_T_SKB;
-				goto tx_buf_done;
-			}
-
 			frame_len = fec16_to_cpu(bdp->cbd_datlen);
 		}
 
-- 
2.34.1