linux-kernel - Re: [PATCH] drivers: rtl818x: request DMA-able memory

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Message-ID: <902045.66378.qm@web29504.mail.ird.yahoo.com>
Date:	Mon, 25 Oct 2010 16:39:58 +0100 (BST)
From:	Hin-Tak Leung <htl10@...rs.sourceforge.net>
To:	"John W. Linville" <linville@...driver.com>
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	Serafeim Zanikolas <sez@...ian.org>, herton@...driva.com.br,
	joe@...ches.com, davem@...emloft.net,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: rtl818x: request DMA-able memory


--- On Mon, 25/10/10, John W. Linville <linville@...driver.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


      
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