linux-kernel - Re: [patch 0/6] hwmon/coretemp: Hotplug fixes, cleanups and state machine conversion

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Date:   Wed, 12 Apr 2017 11:31:56 +0300
From:   Tommi Rantala <tt.rantala@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org
Subject: Re: [patch 0/6] hwmon/coretemp: Hotplug fixes, cleanups and state
 machine conversion

2016-11-23 17:28 GMT+02:00 Guenter Roeck <linux@...ck-us.net>:
>
> On 11/22/2016 09:42 AM, Thomas Gleixner wrote:
>>
>> After the first attempt to convert the coretemp driver to the hotplug state
>> machine failed, we had a deeper look and went a bit farther.
>>
>> The driver has quite some interesting concepts vs. the package, core and
>> sysfs file management and a bug in the package temperature sysfs interface
>> vs. cpu hotplug.
>>
>> The following series fixes that bug and simplifies the package/core
>> management and at the end converts it to the hotplug state machine.
>>
>> Along with the source size the binary size shrinks as well:
>>    text    data     bss     dec     hex
>>    4068    360       20 4448 1160     Before
>>    3801    180       36    4017     fb1   After
>>
>> Thanks,
>>
>>         tglx
>> -----
>>  coretemp.c |  321 +++++++++++++++++++++----------------------------------------
>>  1 file changed, 113 insertions(+), 208 deletions(-)

Hi,

Resume-from-suspend stopped working in HP xw6600 in fedora kernel
4.10.8-200.fc25.x86_64, while it worked just fine in
4.9.9-200.fc25.x86_64.

When powering on the suspended PC, there is no video output, and to
recover, I need to reset the machine.
Nothing is recorded in the journal logs for the resume, last lines are
from the suspend:

  Apr 08 15:41:49 xw6600 systemd[1]: Reached target Sleep.
  Apr 08 15:41:49 xw6600 systemd[1]: Starting Suspend...
  Apr 08 15:41:49 xw6600 systemd-sleep[6675]: Suspending system...

Also tested 4.11-rc5, but it fails the same way.

Bisection leads to commit:

commit e00ca5df37adc68052ea699cbd010ee4e19e39e4
Author: Thomas Gleixner <tglx@...utronix.de>
Date:   Tue Nov 22 17:42:04 2016 +0000

    hwmon: (coretemp) Convert to hotplug state machine

    Install the callbacks via the state machine. Setup and teardown are handled
    by the hotplug core.

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
    Cc: linux-hwmon@...r.kernel.org
    Cc: Fenghua Yu <fenghua.yu@...el.com>
    Cc: Jean Delvare <jdelvare@...e.com>
    Cc: rt@...uxtronix.de
    Cc: Guenter Roeck <linux@...ck-us.net>
    Link: http://lkml.kernel.org/r/20161117183541.8588-5-bigeasy@linutronix.de
    Signed-off-by: Guenter Roeck <linux@...ck-us.net>

If I do "modprobe -r coretemp", then the resume works OK with
4.10.8-200.fc25.x86_64.

Any ideas?

4.9.9-200.fc25.x86_64 dmesg:
http://termbin.com/3kcl

4.10.8-200.fc25.x86_64 dmesg:
http://termbin.com/62d9

-Tommi