linux-kernel - [PATCH 2/2] net: ll_temac: improve reset of buffer on dma mapping

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Message-Id: <20230126101607.88407-2-jsc@umbraculum.org>
Date:   Thu, 26 Jan 2023 11:16:07 +0100
From:   Jonas Suhr Christensen <jsc@...raculum.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, michal.simek@...inx.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        esben@...nix.com, Jonas Suhr Christensen <jsc@...raculum.org>
Subject: [PATCH 2/2] net: ll_temac: improve reset of buffer on dma mapping

Free buffer and set pointer to null on dma mapping error.

Signed-off-by: Jonas Suhr Christensen <jsc@...raculum.org>
---
 drivers/net/ethernet/xilinx/ll_temac_main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
index 66c04027f230..5595ba57a126 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -376,8 +376,11 @@ static int temac_dma_bd_init(struct net_device *ndev)
 		skb_dma_addr = dma_map_single(ndev->dev.parent, skb->data,
 					      XTE_MAX_JUMBO_FRAME_SIZE,
 					      DMA_FROM_DEVICE);
-		if (dma_mapping_error(ndev->dev.parent, skb_dma_addr))
+		if (dma_mapping_error(ndev->dev.parent, skb_dma_addr)) {
+			dev_kfree_skb(lp->rx_skb[i]);
+			lp->rx_skb[i] = NULL;
 			goto out;
+		}
 		lp->rx_bd_v[i].phys = cpu_to_be32(skb_dma_addr);
 		lp->rx_bd_v[i].len = cpu_to_be32(XTE_MAX_JUMBO_FRAME_SIZE);
 		lp->rx_bd_v[i].app0 = cpu_to_be32(STS_CTRL_APP0_IRQONEND);
-- 
2.39.1