Return-path: Received: from mail-yx0-f174.google.com ([209.85.213.174]:34119 "EHLO mail-yx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756831Ab0KAPuu convert rfc822-to-8bit (ORCPT ); Mon, 1 Nov 2010 11:50:50 -0400 Received: by yxk8 with SMTP id 8so2924388yxk.19 for ; Mon, 01 Nov 2010 08:50:49 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <8762whrqvm.fsf@gmail.com> References: <8762whrqvm.fsf@gmail.com> Date: Mon, 1 Nov 2010 16:50:48 +0100 Message-ID: Subject: Re: [ath9k-devel] ath9k: race conditions in dma From: =?ISO-8859-1?Q?Bj=F6rn_Smedman?= To: Ben Gamari Cc: linux-wireless , ath9k-devel@lists.ath9k.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: On Mon, Nov 1, 2010 at 4:43 PM, Ben Gamari wrote: > On Mon, 1 Nov 2010 16:17:23 +0100, Bj?rn Smedman wrote: >> Hi all, >> >> I have an application that creates and destroys a lot of ap vifs and >> does a lot of monitor frame injection. The recent ath9k rx locking >> fixes have helped with stability in this use-case but there still >> seems to be some tx/beacon related race condition(s). These manifests >> themselves as follows on an AR913x based router running >> compat-wireless-2010-10-19 (with locking fixes etc from openwrt): >> >> 1. TX DMA hangs under simultaneous high RX and TX load >> 2. TX is completely hung but chip is never reset > > I have also observed both of these behaviors with just a standard > hostapd single VIF configuration. Quite annoying. It seems to be better > with recent wireless-testing trees. > > - Ben Thanx Ben, it's a relief to know I'm not the only one suffering from this. Unfortunately I can't run wireless-testing (built-in system with out-of-tree arch). Could this be fixed in later compat-wireless snapshots? Can you recommend a specific snapshot? /Bj?rn