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solos-pci: fix double-free of TX skb in DMA mode 

We weren't clearing card->tx_skb[port] when processing the TX done interrupt.
If there wasn't another skb ready to transmit immediately, this led to a
double-free because we'd free it *again* next time we did have a packet to
send.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: stable@kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Woodhouse 2012-12-11 14:57:14 +00:00 committed by David S. Miller
parent fda4d85d61
commit cae49ede00
1 changed files with 3 additions and 2 deletions
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5
drivers/atm/solos-pci.c
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@ -945,10 +945,11 @@ static uint32_t fpga_tx(struct solos_card *card)
for (port = 0; tx_pending; tx_pending >>= 1, port++) {
if (tx_pending & 1) {
struct sk_buff *oldskb = card->tx_skb[port];
if (oldskb)
if (oldskb) {
pci_unmap_single(card->dev, SKB_CB(oldskb)->dma_addr,
oldskb->len, PCI_DMA_TODEVICE);
card->tx_skb[port] = NULL;
}
spin_lock(&card->tx_queue_lock);
skb = skb_dequeue(&card->tx_queue[port]);
if (!skb)