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@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260205085742.2685134-10-wei.fang@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: WeiFang-NXP

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;
@@ -1538,21 +1533,15 @@ 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);
 		}