From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756051AbaGaCHK (ORCPT ); Wed, 30 Jul 2014 22:07:10 -0400 Received: from smtp.codeaurora.org ([198.145.11.231]:56685 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751277AbaGaCHI (ORCPT ); Wed, 30 Jul 2014 22:07:08 -0400 Message-ID: <53D9A4CA.9050403@codeaurora.org> Date: Wed, 30 Jul 2014 19:07:06 -0700 From: Saravana Kannan User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: "Rafael J. Wysocki" CC: Prarit Bhargava , linux-kernel@vger.kernel.org, Viresh Kumar , Lenny Szubowicz , linux-pm@vger.kernel.org Subject: Re: [PATCH] cpufreq, store_scaling_governor requires policy->rwsem to be held for duration of changing governors [v2] References: <1406634362-811-1-git-send-email-prarit@redhat.com> <1816455.s1k7EgIPj9@vostro.rjw.lan> <53D99D80.8090905@codeaurora.org> <3140593.vs3eOK6CdF@vostro.rjw.lan> In-Reply-To: <3140593.vs3eOK6CdF@vostro.rjw.lan> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/30/2014 07:16 PM, Rafael J. Wysocki wrote: > On Wednesday, July 30, 2014 06:36:00 PM Saravana Kannan wrote: >> On 07/30/2014 02:40 PM, Rafael J. Wysocki wrote: >>> On Wednesday, July 30, 2014 10:18:25 AM Prarit Bhargava wrote: >>>> >>>> On 07/29/2014 08:03 PM, Rafael J. Wysocki wrote: >>>>> On Tuesday, July 29, 2014 07:46:02 AM Prarit Bhargava wrote: >>> >>> [cut] >>> >>>>>> This patch effectively reverts commit 955ef483. >> >> The issue reported in this patch is valid. We are seeing that internally >> too. I believe I reported it in another thread (within the past month). >> >> However, the original patch fixes a real deadlock issue (I'm too tired >> to look it up now). We can revet the original, but it's going to bring >> back the original issue. I just want to make sure Prarit and Raphael >> realize this before proceeding. >> >> I do have plans for a proper fix for the mainline (not stable branches), >> but plan to do that after the current set of suspend/hotplug patches go >> through. The fix would be easier to make after that. >> >>>>> >>>>> OK, I'm convinced by this. >>>>> >>>>> I suppose we should push it for -stable from 3.10 through 3.15.x, right? >>>> >>>> Rafael, I think that is a good idea. I'm not sure what the protocol is for >>>> adding stable@kernel.org though ... >>> >>> I'll take care of this, thanks! >>> >> >> But you aren't going to pull the in for the next release, right? > > What do you mean? > Reverting the commit will bring back another dead lock issue. So, you don't want to revert it on mainline. Do I still not make sense because I'm not using the right terms? -Saravana -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation