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Date:   Mon, 23 Jan 2017 06:31:31 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Pavel Machek <pavel@....cz>, pali.rohar@...il.com, sre@...nel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com
Cc:     fabio.estevam@....com, rui.zhang@...el.com
Subject: Re: v4.10-rc4 to v4.10-rc5: battery regression on Nokia N900

On 01/23/2017 06:19 AM, Pavel Machek wrote:
> Hi!
>
>> It seems that battery driver stopped working on N900 between -rc4 and
>> -rc5.
>
> pavel@amd:/data/l/linux-n900$ git bisect log
> # bad: [41f283973653dc44af47585fa79fb6da6ffdc2e2] Merge
> /data//l/clean-cg into mini-v4.10
> # good: [4f8d9925eb1de1ec1c4183164f1bc7b01f5ae185] It seems mainline
> -rc4 did have a fix for the sound issue. Use that one.
> git bisect start 'mini-v4.10'
> '4f8d9925eb1de1ec1c4183164f1bc7b01f5ae185'
> # good: [e90665a5d38b17fdbe484a85fbba917a7006522d] Merge tag
> 'ceph-for-4.10-rc5' of git://github.com/ceph/ceph-client
> git bisect good e90665a5d38b17fdbe484a85fbba917a7006522d
> # good: [83fd57a740bb19286959b3085eb93532f3e7ef2c] Merge tag
> 'powerpc-4.10-2' of
> git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
> git bisect good 83fd57a740bb19286959b3085eb93532f3e7ef2c
> # good: [c497f8d17246720afe680ea1a8fa6e48e75af852] Merge tag
> 'usb-4.10-rc5' of
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
> git bisect good c497f8d17246720afe680ea1a8fa6e48e75af852
> # bad: [bb6c01c2dde67b165cf7c808b0f00677b6f94b96] Merge branch
> 'for-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
> git bisect bad bb6c01c2dde67b165cf7c808b0f00677b6f94b96
> # good: [18591add41ec9558ce0e32ef88626c18cc70c686] thermal: rockchip:
> handle set_trips without the trip points
> git bisect good 18591add41ec9558ce0e32ef88626c18cc70c686
> # bad: [f53345e8cf027d03187b9417f1f8883c516e1a5b] thermal: core: move
> tz->device.groups cleanup to thermal_release
> git bisect bad f53345e8cf027d03187b9417f1f8883c516e1a5b
> # bad: [7611fb68062f8d7f416f3272894d1edf7bbff29c] thermal:
> thermal_hwmon: Convert to hwmon_device_register_with_info()
> git bisect bad 7611fb68062f8d7f416f3272894d1edf7bbff29c
> # first bad commit: [7611fb68062f8d7f416f3272894d1edf7bbff29c]
> thermal: thermal_hwmon: Convert to hwmon_device_register_with_info()
> pavel@amd:/data/l/linux-n900$
>
> pavel@amd:/data/l/linux-n900$ git bisect log
> # bad: [41f283973653dc44af47585fa79fb6da6ffdc2e2] Merge
> /data//l/clean-cg into mini-v4.10
> # good: [4f8d9925eb1de1ec1c4183164f1bc7b01f5ae185] It seems mainline
> -rc4 did have a fix for the sound issue. Use that one.
> git bisect start 'mini-v4.10'
> '4f8d9925eb1de1ec1c4183164f1bc7b01f5ae185'
> # good: [e90665a5d38b17fdbe484a85fbba917a7006522d] Merge tag
> 'ceph-for-4.10-rc5' of git://github.com/ceph/ceph-client
> git bisect good e90665a5d38b17fdbe484a85fbba917a7006522d
> # good: [83fd57a740bb19286959b3085eb93532f3e7ef2c] Merge tag
> 'powerpc-4.10-2' of
> git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
> git bisect good 83fd57a740bb19286959b3085eb93532f3e7ef2c
> # good: [c497f8d17246720afe680ea1a8fa6e48e75af852] Merge tag
> 'usb-4.10-rc5' of
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
> git bisect good c497f8d17246720afe680ea1a8fa6e48e75af852
> # bad: [bb6c01c2dde67b165cf7c808b0f00677b6f94b96] Merge branch
> 'for-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
> git bisect bad bb6c01c2dde67b165cf7c808b0f00677b6f94b96
> # good: [18591add41ec9558ce0e32ef88626c18cc70c686] thermal: rockchip:
> handle set_trips without the trip points
> git bisect good 18591add41ec9558ce0e32ef88626c18cc70c686
> # bad: [f53345e8cf027d03187b9417f1f8883c516e1a5b] thermal: core: move
> tz->device.groups cleanup to thermal_release
> git bisect bad f53345e8cf027d03187b9417f1f8883c516e1a5b
> # bad: [7611fb68062f8d7f416f3272894d1edf7bbff29c] thermal:
> thermal_hwmon: Convert to hwmon_device_register_with_info()
> git bisect bad 7611fb68062f8d7f416f3272894d1edf7bbff29c
> # first bad commit: [7611fb68062f8d7f416f3272894d1edf7bbff29c]
> thermal: thermal_hwmon: Convert to hwmon_device_register_with_info()
> pavel@amd:/data/l/linux-n900$
>
> 7611fb68062f8d7f416f3272894d1edf7bbff29c is the first bad commit
> commit 7611fb68062f8d7f416f3272894d1edf7bbff29c
> Author: Fabio Estevam <fabio.estevam@....com>
> Date:   Tue Dec 27 15:31:49 2016 -0200
>
>     thermal: thermal_hwmon: Convert to
>     hwmon_device_register_with_info()
>
>     Booting Linux on a mx6q based board leads to the following
>     warning:
>
>     (NULL device *): hwmon_device_register() is deprecated. Please
>     convert the
>         driver to use hwmon_device_register_with_info().
>
>     ,so do as suggested.
>
>     Also, this results in the core taking care of creating the 'name'
>         attribute, so drop the code doing that from the thermal
>         driver.
>
>  Suggested-by: Guenter Roeck <linux@...ck-us.net>
>  Signed-off-by: Fabio Estevam <fabio.estevam@....com>
>  Signed-off-by: Zhang Rui <rui.zhang@...el.com>
>
> :040000 040000 b3f6095ab53677277c2f9d75cb6430afb6825765
> 156a18e983a22b8ae43c7b312a4e1c63017f0e26 M	drivers
>
> I'll try to revert it on the top of v4.10-rc5 now... and yes, it fixes
> the issue.
>
> Any idea what went wrong and how to fix that?
>
> Anyway as we are at -rc5 and this is warning fix that caused a
> regression on different hardware... it should be reverted.
>
Agreed.

What exactly does "stopped working" mean ? That might help understanding
what went wrong.

Thanks,
Guenter


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