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Date: Mon, 25 Oct 2010 16:39:58 +0100 (BST)
From: Hin-Tak Leung <htl10@users.sourceforge.net>
Reply-To: htl10@users.sourceforge.net
Subject: Re: [PATCH] drivers: rtl818x: request DMA-able memory
To: "John W. Linville" <linville@tuxdriver.com>
Cc: Larry Finger <Larry.Finger@lwfinger.net>,
        Serafeim Zanikolas <sez@debian.org>, herton@mandriva.com.br,
        joe@perches.com, davem@davemloft.net, linux-wireless@vger.kernel.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
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--- On Mon, 25/10/10, John W. Linville <linville@tuxdriver.com> wrote:

> > I had a quick look for similiar constructs and AFAIK
> only the
> > b43/b43legacy drivers uses DMA buffers. Seems to be a
> rare practice.
> > Is that something we should or should not do?
> 
> It doesn't mean what you think it means.  It is a
> relic of the past,
> used to indicate memory below 16MB so that ISA devices
> could do DMA.

okay - sorry about the confusion - I was grep'ing for GFP_DMA and only b43/b43lagacy have it and it is relatively rare. AFAIK none of the rtl8187 devices are non-USB... probably a NACK then, but I should ask Serafeim if there is a reason for him to submit this patch? (other than "it says dma"...) 

Hin-tak