Return-path: Received: from mail-iw0-f174.google.com ([209.85.214.174]:63708 "EHLO mail-iw0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751874Ab0JIPTw convert rfc822-to-8bit (ORCPT ); Sat, 9 Oct 2010 11:19:52 -0400 Received: by iwn6 with SMTP id 6so1512556iwn.19 for ; Sat, 09 Oct 2010 08:19:52 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20101005195039.GD11831@tux> References: <20101005131744.GB4074@tuxdriver.com> <20101005195039.GD11831@tux> Date: Sat, 9 Oct 2010 17:19:51 +0200 Message-ID: Subject: Re: [ath9k-devel] [RFC] ath9k: Insert wmb before linking dma descriptors From: =?ISO-8859-1?Q?Bj=F6rn_Smedman?= To: Felix Fietkau Cc: "John W. Linville" , "Luis R. Rodriguez" , "ath9k-devel@venema.h4ckr.net" , linux-wireless Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: On Tue, Oct 5, 2010 at 9:50 PM, Luis R. Rodriguez wrote: > Felix is more familiar with this area so I'll let him chime with > his ACK/NACK. > > ?Luis So Felix, what do you think? I realize it may not be a common problem on any currently popular platform, but don't you agree it is in principle unsafe to write to the ds_link field of dma descriptors without a guarantee that those writes will be performed in the intended order? /Bj?rn