linux-kernel - [PATCH] atm: eni: Add check for dma_map

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Date:   Fri, 11 Mar 2022 15:16:56 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     3chas3@...il.com
Cc:     linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] atm: eni: Add check for dma_map_single

As the potential failure of the dma_map_single(),
it should be better to check it and return error
if fails.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/atm/eni.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/atm/eni.c b/drivers/atm/eni.c
index 422753d52244..96c2d8f5646b 100644
--- a/drivers/atm/eni.c
+++ b/drivers/atm/eni.c
@@ -1112,6 +1112,8 @@ DPRINTK("iovcnt = %d\n",skb_shinfo(skb)->nr_frags);
 	skb_data3 = skb->data[3];
 	paddr = dma_map_single(&eni_dev->pci_dev->dev,skb->data,skb->len,
 			       DMA_TO_DEVICE);
+	if (dma_mapping_error(&eni_dev->pci_dev->dev, paddr))
+		return enq_jam;
 	ENI_PRV_PADDR(skb) = paddr;
 	/* prepare DMA queue entries */
 	j = 0;
-- 
2.25.1