netdev - [PATCH v2] net: natsemi: ns83820: add checks for dma mapping error

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Date:   Sat, 22 Apr 2017 16:06:05 +0300
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH v2] net: natsemi: ns83820: add checks for dma mapping error

The driver does not check if mapping dma memory succeed.
The patch adds the checks and failure handling.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/net/ethernet/natsemi/ns83820.c | 42 +++++++++++++++++++++++++++++++---
 1 file changed, 39 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/natsemi/ns83820.c b/drivers/net/ethernet/natsemi/ns83820.c
index 729095db3e08..dfc64e1e31f9 100644
--- a/drivers/net/ethernet/natsemi/ns83820.c
+++ b/drivers/net/ethernet/natsemi/ns83820.c
@@ -534,14 +534,19 @@ static inline int ns83820_add_rx_skb(struct ns83820 *dev, struct sk_buff *skb)
 		);
 #endif
 
+	buf = pci_map_single(dev->pci_dev, skb->data,
+			     REAL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+	if (pci_dma_mapping_error(dev->pci_dev, buf)) {
+		kfree_skb(skb);
+		return 1;
+	}
+
 	sg = dev->rx_info.descs + (next_empty * DESC_SIZE);
 	BUG_ON(NULL != dev->rx_info.skbs[next_empty]);
 	dev->rx_info.skbs[next_empty] = skb;
 
 	dev->rx_info.next_empty = (next_empty + 1) % NR_RX_DESC;
 	cmdsts = REAL_RX_BUF_SIZE | CMDSTS_INTR;
-	buf = pci_map_single(dev->pci_dev, skb->data,
-			     REAL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
 	build_rx_desc(dev, sg, 0, buf, cmdsts, 0);
 	/* update link of previous rx */
 	if (likely(next_empty != dev->rx_info.next_rx))
@@ -1068,6 +1073,7 @@ static netdev_tx_t ns83820_hard_start_xmit(struct sk_buff *skb,
 	int stopped = 0;
 	int do_intr = 0;
 	volatile __le32 *first_desc;
+	volatile __le32 *desc;
 
 	dprintk("ns83820_hard_start_xmit\n");
 
@@ -1136,11 +1142,13 @@ static netdev_tx_t ns83820_hard_start_xmit(struct sk_buff *skb,
 	if (nr_frags)
 		len -= skb->data_len;
 	buf = pci_map_single(dev->pci_dev, skb->data, len, PCI_DMA_TODEVICE);
+	if (pci_dma_mapping_error(dev->pci_dev, buf))
+		goto dma_error_first;
 
 	first_desc = dev->tx_descs + (free_idx * DESC_SIZE);
 
 	for (;;) {
-		volatile __le32 *desc = dev->tx_descs + (free_idx * DESC_SIZE);
+		desc = dev->tx_descs + (free_idx * DESC_SIZE);
 
 		dprintk("frag[%3u]: %4u @ 0x%08Lx\n", free_idx, len,
 			(unsigned long long)buf);
@@ -1160,6 +1168,8 @@ static netdev_tx_t ns83820_hard_start_xmit(struct sk_buff *skb,
 
 		buf = skb_frag_dma_map(&dev->pci_dev->dev, frag, 0,
 				       skb_frag_size(frag), DMA_TO_DEVICE);
+		if (dma_mapping_error(&dev->pci_dev->dev, buf))
+			goto dma_error;
 		dprintk("frag: buf=%08Lx  page=%08lx offset=%08lx\n",
 			(long long)buf, (long) page_to_pfn(frag->page),
 			frag->page_offset);
@@ -1183,6 +1193,32 @@ static netdev_tx_t ns83820_hard_start_xmit(struct sk_buff *skb,
 		netif_start_queue(ndev);
 
 	return NETDEV_TX_OK;
+
+dma_error:
+	do {
+		free_idx = (free_idx + NR_TX_DESC - 1) % NR_TX_DESC;
+		desc = dev->tx_descs + (free_idx * DESC_SIZE);
+		cmdsts = le32_to_cpu(desc[DESC_CMDSTS]);
+		len = cmdsts & CMDSTS_LEN_MASK;
+		buf = desc_addr_get(desc + DESC_BUFPTR);
+		if (desc == first_desc)
+			pci_unmap_single(dev->pci_dev,
+					buf,
+					len,
+					PCI_DMA_TODEVICE);
+		else
+			pci_unmap_page(dev->pci_dev,
+					buf,
+					len,
+					PCI_DMA_TODEVICE);
+		desc[DESC_CMDSTS] = cpu_to_le32(0);
+		mb();
+	} while (desc != first_desc);
+
+dma_error_first:
+	dev_kfree_skb_any(skb);
+	ndev->stats.tx_errors++;
+	return NETDEV_TX_OK;
 }
 
 static void ns83820_update_stats(struct ns83820 *dev)
-- 
2.7.4