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

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Message-ID: <4CC5C5F5.3080607@lwfinger.net>
Date:	Mon, 25 Oct 2010 13:01:25 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	htl10@...rs.sourceforge.net
CC:	"John W. Linville" <linville@...driver.com>,
	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 10/25/2010 10:39 AM, Hin-Tak Leung wrote:
> 
> 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"...) 

There are some devices driven by b43/b43legacy that implement only 24-bit DMA.
For that reason, they need to allocate DMA buffers in the low 16 MB of RAM. For
rtl8187, that consideration does not apply.

Larry
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