netdev - [PATCH 10/15] spidernet: invalidate unused pointer.

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Message-ID: <20070611185203.GJ13741@austin.ibm.com>
Date:	Mon, 11 Jun 2007 13:52:03 -0500
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Michael Ellerman <michael@...erman.id.au>, netdev@...r.kernel.org,
	cbe-oss-dev@...abs.org
Subject: [PATCH 10/15] 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@...tin.ibm.com>

----
 drivers/net/spider_net.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Index: linux-2.6.22-rc1/drivers/net/spider_net.c
===================================================================
--- linux-2.6.22-rc1.orig/drivers/net/spider_net.c	2007-06-11 11:51:19.000000000 -0500
+++ linux-2.6.22-rc1/drivers/net/spider_net.c	2007-06-11 11:53:21.000000000 -0500
@@ -1187,6 +1187,7 @@ spider_net_decode_one_descr(struct spide
 	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 spide
 	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) ||
@@ -1237,7 +1240,7 @@ spider_net_decode_one_descr(struct spide
 		dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n",
 			       card->netdev->name,
 			       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);
-
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