linux-kernel - Re: [PATCH] sky2: receive dma mapping error handling

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Date:	Tue, 02 Feb 2010 23:44:37 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	Michael Breuer <mbreuer@...jas.com>,
	Jarek Poplawski <jarkao2@...il.com>,
	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	flyboy@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Michael Chan <mchan@...adcom.com>,
	Don Fry <pcnet32@...izon.net>,
	Francois Romieu <romieu@...zoreil.com>,
	Matt Carlson <mcarlson@...adcom.com>
Subject: Re: [PATCH] sky2:  receive dma mapping error handling

Stephen Hemminger <shemminger@...ux-foundation.org> writes:

> -	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
> -		re->frag_addr[i] = pci_map_page(pdev,
> +
> +map_page_error:
> +	while (--i >= 0) {
> +		pci_unmap_page(pdev, re->frag_addr[i],
> +			       skb_shinfo(skb)->frags[i].size,
> +			       PCI_DMA_FROMDEVICE);
> +	}
> +
> +	pci_unmap_single(pdev, re->data_addr, pci_unmap_len(re, data_size),
> +			 PCI_DMA_FROMDEVICE);

Better add a helper somewhere to do this, doesn't make sense
to duplicate this in all drivers (lots of drivers have similar
problems)

I remember looking at this some time ago but for some reason
the patches never made it out.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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