Message-id: <5837E893.1020409@samsung.com>
Date: Fri, 25 Nov 2016 16:30:27 +0900
From: Joonyoung Shim <jy0922.shim@samsung.com>
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101
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To: Viresh Kumar <viresh.kumar@linaro.org>
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
Subject: Re: [PATCH] PM / OPP: fix CPU device to be removed from OPP table in
 wrong order
References: <1479973761-21225-1-git-send-email-jy0922.shim@samsung.com>
 <CGME20161124084531epcas2p1f662ed5a74f2c6f3da5911f1fe38a200@epcas2p1.samsung.com>
 <20161124083403.GA29969@vireshk-i7> <583799EC.4060101@samsung.com>
 <20161125065739.GC29969@vireshk-i7>
In-reply-to: <20161125065739.GC29969@vireshk-i7>
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Hi Viresh,

On 11/25/2016 03:57 PM, Viresh Kumar wrote:
> 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 ?
> 

Thanks for the patch, i tested it and it is working well.

Thanks.