From mboxrd@z Thu Jan 1 00:00:00 1970 From: Viresh Kumar Subject: Re: [PATCH] PM / OPP: fix CPU device to be removed from OPP table in wrong order Date: Fri, 25 Nov 2016 12:27:39 +0530 Message-ID: <20161125065739.GC29969@vireshk-i7> References: <1479973761-21225-1-git-send-email-jy0922.shim@samsung.com> <20161124083403.GA29969@vireshk-i7> <583799EC.4060101@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-pg0-f52.google.com ([74.125.83.52]:35861 "EHLO mail-pg0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752243AbcKYG61 (ORCPT ); Fri, 25 Nov 2016 01:58:27 -0500 Received: by mail-pg0-f52.google.com with SMTP id f188so26526568pgc.3 for ; Thu, 24 Nov 2016 22:57:47 -0800 (PST) Content-Disposition: inline In-Reply-To: <583799EC.4060101@samsung.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Joonyoung Shim Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, vireshk@kernel.org, nm@ti.com, sboyd@codeaurora.org, rjw@rjwysocki.net, len.brown@intel.com, pavel@ucw.cz, gregkh@linuxfoundation.org On 25-11-16, 10:54, Joonyoung Shim wrote: > I found this problem during system suspend/resume of Odroid-XU3 board. > > # rtcwake -m mem -s 3 > wakeup from "mem" at Wed Apr 4 05:54:44 2001 > [ 15.965996] PM: Syncing filesystems ... done. > [ 15.976333] Freezing user space processes ... (elapsed 0.002 seconds) done. > [ 15.983287] Freezing remaining freezable tasks ... (elapsed 0.002 seconds) done. > [ 16.006951] wake enabled for irq 135 > [ 16.008782] smsc95xx 1-1.1:1.0 eth0: entering SUSPEND2 mode > [ 16.094110] PM: suspend of devices complete after 95.038 msecs > [ 16.105648] PM: late suspend of devices complete after 6.903 msecs > [ 16.116356] PM: noirq suspend of devices complete after 5.912 msecs > [ 16.121213] Disabling non-boot CPUs ... > [ 16.154140] IRQ51 no longer affine to CPU1 > [ 16.154709] CPU1: shutdown > [ 16.214148] IRQ52 no longer affine to CPU2 > [ 16.214646] CPU2: shutdown > [ 16.273980] IRQ53 no longer affine to CPU3 > [ 16.274458] CPU3: shutdown > [ 16.335093] IRQ54 no longer affine to CPU4 > [ 16.336033] CPU4: shutdown > [ 16.389979] IRQ55 no longer affine to CPU5 > [ 16.390823] CPU5: shutdown > [ 16.444829] IRQ56 no longer affine to CPU6 > [ 16.445621] CPU6: shutdown > [ 16.509229] cpu cpu4: Failed to find opp_table: -19 > [ 16.514008] IRQ57 no longer affine to CPU7 > [ 16.514824] CPU7: shutdown Hi, Yes you have found a real bug it seems. I think that can be reproduced by a simple rmmmod of cpufreq-dt.ko module as well. Though the solution you provided isn't good enough. Consider for example a case where you do this: - offline CPU 4 - suspend the system You are going to get stuck in the exact same problem again. I have sent a separate patch and cc'd you. Can you please verify that it works for you ? -- viresh