linux-kernel - Re: Hang: 2.6.32.4 sky2/DMAR (was [PATCH] sky2: Fix WARNING: at lib/dma-debug.c:902 check

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Message-id: <4B608128.7090607@majjas.com>
Date:	Wed, 27 Jan 2010 13:08:40 -0500
From:	Michael Breuer <mbreuer@...jas.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	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: Hang: 2.6.32.4 sky2/DMAR (was [PATCH] sky2: Fix WARNING: at
 lib/dma-debug.c:902 check_sync)

On 01/27/2010 12:56 PM, Stephen Hemminger wrote:
> --- a/drivers/net/sky2.c	2010-01-27 09:46:10.940005248 -0800
> +++ b/drivers/net/sky2.c	2010-01-27 09:53:47.141267850 -0800
> @@ -2257,13 +2257,16 @@ static struct sk_buff *receive_copy(stru
>
>   	skb = netdev_alloc_skb_ip_align(sky2->netdev, length);
>   	if (likely(skb)) {
> +		unsigned dma_align = dma_get_cache_alignment();
> +		unsigned dma_size = ALIGN(length+1, dma_align);
> +
>   		pci_dma_sync_single_for_cpu(sky2->hw->pdev, re->data_addr,
> -					    length, PCI_DMA_FROMDEVICE);
> +					    dma_size, PCI_DMA_FROMDEVICE);
>   		skb_copy_from_linear_data(re->skb, skb->data, length);
>   		skb->ip_summed = re->skb->ip_summed;
>   		skb->csum = re->skb->csum;
>   		pci_dma_sync_single_for_device(sky2->hw->pdev, re->data_addr,
> -					       length, PCI_DMA_FROMDEVICE);
> +					       dma_size, PCI_DMA_FROMDEVICE);
>   		re->skb->ip_summed = CHECKSUM_NONE;
>   		skb_put(skb, length);
>   	}
>    
This doesn't apply - I'm missing some intermediate patch.

I've got (both in 2.6.32.4 and 2.6.33-rc5: pci_unmap_len(re, data_size) 
vs., "length." I assume that I can just replace the pci_unmap_len with 
dma_size... but perhaps the intermediate change may have affected this 
as well?
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