From mboxrd@z Thu Jan  1 00:00:00 1970
From: "David S. Miller" <davem@redhat.com>
Subject: Re: Dealing with buggy hardware (was: b44 and 4g4g)
Date: Sat, 5 Jun 2004 13:19:23 -0700
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	<20040605200643.GA2210@ee.oulu.fi>
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To: Pekka Pietikainen <pp@ee.oulu.fi>
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On Sat, 5 Jun 2004 23:06:44 +0300
Pekka Pietikainen <pp@ee.oulu.fi> wrote:

> +	if(virt_to_bus(skb->data) + skb->len > B44_PCI_DMA_MAX) {

You can't use this non-portable interface, you have to:

1) pci_map the data
2) test the dma_addr_t returned