From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hin-Tak Leung Subject: Re: [PATCH] drivers: rtl818x: request DMA-able memory Date: Mon, 25 Oct 2010 16:39:58 +0100 (BST) Message-ID: <902045.66378.qm@web29504.mail.ird.yahoo.com> References: <20101025142232.GC2414@tuxdriver.com> Reply-To: htl10@users.sourceforge.net Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Larry Finger , Serafeim Zanikolas , herton@mandriva.com.br, joe@perches.com, davem@davemloft.net, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org To: "John W. Linville" Return-path: Received: from web29504.mail.ird.yahoo.com ([77.238.189.131]:27801 "HELO web29504.mail.ird.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1756508Ab0JYPql convert rfc822-to-8bit (ORCPT ); Mon, 25 Oct 2010 11:46:41 -0400 In-Reply-To: <20101025142232.GC2414@tuxdriver.com> Sender: netdev-owner@vger.kernel.org List-ID: --- On Mon, 25/10/10, John W. Linville 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? >=20 > It doesn't mean what you think it means.=A0 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 rtl8= 187 devices are non-USB... probably a NACK then, but I should ask Seraf= eim if there is a reason for him to submit this patch? (other than "it = says dma"...)=20 Hin-tak =20