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spidernet: invalidate unused pointer. 

Invalidate a pointer as its pci_unmap'ed; this is a bit of
paranoia to make sure hardware doesn't continue trying to
DMA to it.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Linas Vepstas 2007-06-11 13:52:03 -05:00 committed by Jeff Garzik
parent 9948357d49
commit 9e0a6e2598
1 changed files with 5 additions and 2 deletions
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7
drivers/net/spider_net.c
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@ -1187,6 +1187,7 @@ spider_net_decode_one_descr(struct spider_net_card *card)
struct spider_net_descr_chain *chain = &card->rx_chain;
struct spider_net_descr *descr = chain->tail;
struct spider_net_hw_descr *hwdescr = descr->hwdescr;
u32 hw_buf_addr;
int status;
status = spider_net_get_descr_status(hwdescr);
@ -1200,7 +1201,9 @@ spider_net_decode_one_descr(struct spider_net_card *card)
chain->tail = descr->next;
/* unmap descriptor */
pci_unmap_single(card->pdev, hwdescr->buf_addr,
hw_buf_addr = hwdescr->buf_addr;
hwdescr->buf_addr = 0xffffffff;
pci_unmap_single(card->pdev, hw_buf_addr,
SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
@ -1235,7 +1238,7 @@ spider_net_decode_one_descr(struct spider_net_card *card)
if (hwdescr->dmac_cmd_status & 0xfcf4) {
dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n",
hwdescr->dmac_cmd_status);
pr_err("buf_addr=x%08x\n", hwdescr->buf_addr);
pr_err("buf_addr=x%08x\n", hw_buf_addr);
pr_err("buf_size=x%08x\n", hwdescr->buf_size);
pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr);
pr_err("result_size=x%08x\n", hwdescr->result_size);