netdev - Re: [PATCH 3/9] netdev: bfin_mac: invalid data cache only once for each new rx skb buffer

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Message-Id: <20100517.172138.48493572.davem@davemloft.net>
Date:	Mon, 17 May 2010 17:21:38 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	vapier@...too.org
Cc:	netdev@...r.kernel.org, uclinux-dist-devel@...ckfin.uclinux.org,
	sonic.zhang@...log.com
Subject: Re: [PATCH 3/9] netdev: bfin_mac: invalid data cache only once for
 each new rx skb buffer

From: Mike Frysinger <vapier@...too.org>
Date: Mon, 10 May 2010 11:39:08 -0400

> From: Sonic Zhang <sonic.zhang@...log.com>
> 
> The skb buffer isn't actually used until we finish transferring and pass
> it up to higher layers, so only invalidate the range once before we start
> receiving actual data.  This also avoids the problem with data invalidating
> on Blackfin systems -- there is no invalidate-only, just invalidate+flush.
> So when running in writeback mode, there is the small (but not uncommon)
> possibility of the flush overwriting valid DMA-ed data from the cache.
> 
> Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
> Signed-off-by: Mike Frysinger <vapier@...too.org>

Applied.
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