sky2: handle dma mapping errors
On non-x86 platforms it is possible to run out of DMA mapping resources.
The driver was ignoring this and could cause corruptions.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index db92508..8b9b884 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1068,13 +1068,16 @@
}
-static void sky2_rx_map_skb(struct pci_dev *pdev, struct rx_ring_info *re,
+static int sky2_rx_map_skb(struct pci_dev *pdev, struct rx_ring_info *re,
unsigned size)
{
struct sk_buff *skb = re->skb;
int i;
re->data_addr = pci_map_single(pdev, skb->data, size, PCI_DMA_FROMDEVICE);
+ if (unlikely(pci_dma_mapping_error(pdev, re->data_addr)))
+ return -EIO;
+
pci_unmap_len_set(re, data_size, size);
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
@@ -1083,6 +1086,7 @@
skb_shinfo(skb)->frags[i].page_offset,
skb_shinfo(skb)->frags[i].size,
PCI_DMA_FROMDEVICE);
+ return 0;
}
static void sky2_rx_unmap_skb(struct pci_dev *pdev, struct rx_ring_info *re)
@@ -1354,7 +1358,12 @@
if (!re->skb)
goto nomem;
- sky2_rx_map_skb(hw->pdev, re, sky2->rx_data_size);
+ if (sky2_rx_map_skb(hw->pdev, re, sky2->rx_data_size)) {
+ dev_kfree_skb(re->skb);
+ re->skb = NULL;
+ goto nomem;
+ }
+
sky2_rx_submit(sky2, re);
}
@@ -1547,7 +1556,7 @@
struct sky2_hw *hw = sky2->hw;
struct sky2_tx_le *le = NULL;
struct tx_ring_info *re;
- unsigned i, len;
+ unsigned i, len, first_slot;
dma_addr_t mapping;
u16 mss;
u8 ctrl;
@@ -1555,13 +1564,17 @@
if (unlikely(tx_avail(sky2) < tx_le_req(skb)))
return NETDEV_TX_BUSY;
- if (unlikely(netif_msg_tx_queued(sky2)))
- printk(KERN_DEBUG "%s: tx queued, slot %u, len %d\n",
- dev->name, sky2->tx_prod, skb->len);
-
len = skb_headlen(skb);
mapping = pci_map_single(hw->pdev, skb->data, len, PCI_DMA_TODEVICE);
+ if (pci_dma_mapping_error(hw->pdev, mapping))
+ goto mapping_error;
+
+ first_slot = sky2->tx_prod;
+ if (unlikely(netif_msg_tx_queued(sky2)))
+ printk(KERN_DEBUG "%s: tx queued, slot %u, len %d\n",
+ dev->name, first_slot, skb->len);
+
/* Send high bits if needed */
if (sizeof(dma_addr_t) > sizeof(u32)) {
le = get_tx_le(sky2);
@@ -1648,6 +1661,9 @@
mapping = pci_map_page(hw->pdev, frag->page, frag->page_offset,
frag->size, PCI_DMA_TODEVICE);
+ if (pci_dma_mapping_error(hw->pdev, mapping))
+ goto mapping_unwind;
+
if (sizeof(dma_addr_t) > sizeof(u32)) {
le = get_tx_le(sky2);
le->addr = cpu_to_le32(upper_32_bits(mapping));
@@ -1676,6 +1692,34 @@
dev->trans_start = jiffies;
return NETDEV_TX_OK;
+
+mapping_unwind:
+ for (i = first_slot; i != sky2->tx_prod; i = RING_NEXT(i, TX_RING_SIZE)) {
+ le = sky2->tx_le + i;
+ re = sky2->tx_ring + i;
+
+ switch(le->opcode & ~HW_OWNER) {
+ case OP_LARGESEND:
+ case OP_PACKET:
+ pci_unmap_single(hw->pdev,
+ pci_unmap_addr(re, mapaddr),
+ pci_unmap_len(re, maplen),
+ PCI_DMA_TODEVICE);
+ break;
+ case OP_BUFFER:
+ pci_unmap_page(hw->pdev, pci_unmap_addr(re, mapaddr),
+ pci_unmap_len(re, maplen),
+ PCI_DMA_TODEVICE);
+ break;
+ }
+ }
+
+ sky2->tx_prod = first_slot;
+mapping_error:
+ if (net_ratelimit())
+ dev_warn(&hw->pdev->dev, "%s: tx mapping error\n", dev->name);
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
}
/*
@@ -2191,7 +2235,11 @@
prefetch(skb->data);
re->skb = nskb;
- sky2_rx_map_skb(sky2->hw->pdev, re, hdr_space);
+ if (sky2_rx_map_skb(sky2->hw->pdev, re, hdr_space)) {
+ dev_kfree_skb(nskb);
+ re->skb = skb;
+ return NULL;
+ }
if (skb_shinfo(skb)->nr_frags)
skb_put_frags(skb, hdr_space, length);