linux-kernel - [PATCH v2] atm: idt77252: Add missing `dma_map

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Message-ID: <20250624064148.12815-3-fourier.thomas@gmail.com>
Date: Tue, 24 Jun 2025 08:41:47 +0200
From: Thomas Fourier <fourier.thomas@...il.com>
To: 
Cc: Thomas Fourier <fourier.thomas@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Chas Williams <3chas3@...il.com>,
	linux-atm-general@...ts.sourceforge.net (moderated list:ATM),
	netdev@...r.kernel.org (open list:ATM),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] atm: idt77252: Add missing `dma_map_error()`

The DMA map functions can fail and should be tested for errors.

Signed-off-by: Thomas Fourier <fourier.thomas@...il.com>
---
 drivers/atm/idt77252.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c
index 1206ab764ba9..f2e91b7d79f0 100644
--- a/drivers/atm/idt77252.c
+++ b/drivers/atm/idt77252.c
@@ -852,6 +852,8 @@ queue_skb(struct idt77252_dev *card, struct vc_map *vc,
 
 	IDT77252_PRV_PADDR(skb) = dma_map_single(&card->pcidev->dev, skb->data,
 						 skb->len, DMA_TO_DEVICE);
+	if (dma_mapping_error(&card->pcidev->dev, IDT77252_PRV_PADDR(skb)))
+		return -ENOMEM;
 
 	error = -EINVAL;
 
@@ -1857,6 +1859,8 @@ add_rx_skb(struct idt77252_dev *card, int queue,
 		paddr = dma_map_single(&card->pcidev->dev, skb->data,
 				       skb_end_pointer(skb) - skb->data,
 				       DMA_FROM_DEVICE);
+		if (dma_mapping_error(&card->pcidev->dev, paddr))
+			goto outpoolrm;
 		IDT77252_PRV_PADDR(skb) = paddr;
 
 		if (push_rx_skb(card, skb, queue)) {
@@ -1871,6 +1875,7 @@ add_rx_skb(struct idt77252_dev *card, int queue,
 	dma_unmap_single(&card->pcidev->dev, IDT77252_PRV_PADDR(skb),
 			 skb_end_pointer(skb) - skb->data, DMA_FROM_DEVICE);
 
+outpoolrm:
 	handle = IDT77252_PRV_POOL(skb);
 	card->sbpool[POOL_QUEUE(handle)].skb[POOL_INDEX(handle)] = NULL;
 
-- 
2.43.0