Return-path: Received: from mail-ew0-f46.google.com ([209.85.215.46]:45991 "EHLO mail-ew0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753282Ab1HYRYJ convert rfc822-to-8bit (ORCPT ); Thu, 25 Aug 2011 13:24:09 -0400 Received: by ewy4 with SMTP id 4so1118248ewy.19 for ; Thu, 25 Aug 2011 10:24:08 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <4e55750c.GPPIrbNLynUMWY/U%Larry.Finger@lwfinger.net> References: <4e55750c.GPPIrbNLynUMWY/U%Larry.Finger@lwfinger.net> Date: Thu, 25 Aug 2011 19:24:08 +0200 Message-ID: (sfid-20110825_192414_510367_16DB2F77) Subject: Re: [RFC/RFT] b43: Relax requirement for descriptors to be in the DMA zone From: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= To: Larry Finger Cc: John W Linville , Michael Buesch , b43-dev@lists.infradead.org, linux-wireless@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: 2011/8/25 Larry Finger : > When 64-bit DMA was first used, there were problems with the > BCM4311 (14e4:4311). The problem was "fixed" by using the GFP_DMA > flag in the allocation of coherent ring descriptor memory. > > The original problem is now believed to have been due to bugs in > the 64-bit DMA implementation in the rest of the kernel, and that > those bugs have been fixed. Accordingly, the requirement for the > descriptors to be in the DMA zone is relaxed. Larry, it is not clear to me from the commit message: did you test that patch with your 14e4:4311? -- Rafał