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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Date:	Wed, 27 Jan 2010 13:45:27 -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 1/27/2010 1:08 PM, Michael Breuer wrote:
> 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?
>
Never mind - that was from one of the earlier patches I had been trying 
out. will try the above patch after reestablishing that the system still 
crashes without copybreak=1.

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