Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756677AbcLAAZz (ORCPT ); Wed, 30 Nov 2016 19:25:55 -0500 Received: from mail-pg0-f45.google.com ([74.125.83.45]:35329 "EHLO mail-pg0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755540AbcLAAZw (ORCPT ); Wed, 30 Nov 2016 19:25:52 -0500 Date: Thu, 1 Dec 2016 05:55:48 +0530 From: Viresh Kumar To: Stephen Boyd Cc: Rafael Wysocki , jy0922.shim@samsung.com, Viresh Kumar , Nishanth Menon , linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Vincent Guittot , "# v4 . 4+" Subject: Re: [PATCH V5] PM / OPP: Pass opp_table to dev_pm_opp_put_regulator() Message-ID: <20161201002548.GO3288@vireshk-i7> References: <480ae6e161788d338fb1637aa2615a75588ac3c6.1480478081.git.viresh.kumar@linaro.org> <79cd13ecd7fae57d8afb0c73106ae071c665bf66.1480502882.git.viresh.kumar@linaro.org> <20161130220019.GK6095@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161130220019.GK6095@codeaurora.org> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1890 Lines: 48 On 30-11-16, 14:00, Stephen Boyd wrote: > On 11/30, Viresh Kumar wrote: > > From: Stephen Boyd > > > > Joonyoung Shim reported an interesting problem on his ARM octa-core > > Odoroid-XU3 platform. During system suspend, dev_pm_opp_put_regulator() > > was failing for a struct device for which dev_pm_opp_set_regulator() is > > called earlier. > > > > This happened because an earlier call to > > dev_pm_opp_of_cpumask_remove_table() function (from cpufreq-dt.c file) > > removed all the entries from opp_table->dev_list apart from the last CPU > > device in the cpumask of CPUs sharing the OPP. > > > > But both dev_pm_opp_set_regulator() and dev_pm_opp_put_regulator() > > routines get CPU device for the first CPU in the cpumask. And so the OPP > > core failed to find the OPP table for the struct device. > > > > This patch attempts to fix this problem by returning a pointer to the > > opp_table from dev_pm_opp_set_regulator() and using that as the > > parameter to dev_pm_opp_put_regulator(). This ensures that the > > dev_pm_opp_put_regulator() doesn't fail to find the opp table. > > > > Note that similar design problem also exists with other > > dev_pm_opp_put_*() APIs, but those aren't used currently by anyone and > > so we don't need to update them for now. > > > > [Viresh]: Written commit log and tested on exynos 5250. > > > > Cc: # v4.4+ > > Reported-by: Joonyoung Shim > > Signed-off-by: Stephen Boyd > > Signed-off-by: Viresh Kumar > > --- > > You should have asked for my Signed-off-by instead of just adding > it. I was worried about the 24 hrs that gets wasted because of 12 hrs difference in our time zones and so added you as the author and added your sob. :) > Here it is to make things explicit and recorded: Thanks. -- viresh