Date: Wed, 27 Jan 2010 15:54:23 -0800 (PST)
Message-Id: <20100127.155423.169231741.davem@davemloft.net>
To: shemminger@vyatta.com
Cc: mbreuer@majjas.com, jarkao2@gmail.com, akpm@linux-foundation.org,
       flyboy@gmail.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
       mchan@broadcom.com, pcnet32@verizon.net, romieu@fr.zoreil.com,
       mcarlson@broadcom.com
Subject: Re: Hang: 2.6.32.4 sky2/DMAR
From: David Miller <davem@davemloft.net>
In-Reply-To: <20100127094531.53c85aa7@nehalam>
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	<4B60707F.1000608@majjas.com>
	<20100127094531.53c85aa7@nehalam>
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From: Stephen Hemminger <shemminger@vyatta.com>
Date: Wed, 27 Jan 2010 09:45:31 -0800

> Setting it to 1 causes driver to never go through the dma_sync_single/memcpy
> path.  Perhaps the code for DMAR doesn't do dma_sync_single_for_cpu
> properly, or the value passed to sync_single_for_cpu doesn't account for
> all the overhead of padding and/or ether header.

For the millionth time...

DMAR does not implement any of the DMA SYNC operations, they are set
to NULL in the dma ops vector, and thus are NOPs.
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