Re: Adding iTCO_wdt fixes into 4.9-stable?

["Krzysztof Olędzki" <ole@ans.pl>]

Hi,

W dniu 2018-11-23 o 11:26, Sasha Levin pisze:
> On Mon, Nov 19, 2018 at 08:32:03AM -0800, Krzysztof Olędzki wrote:
>> +cc stable@vger.kernel.org
>>
>> W dniu 2018-11-19 o 02:31, Mika Westerberg pisze:
>>> On Sun, Nov 18, 2018 at 07:13:18PM -0800, Krzysztof Olędzki wrote:
>>>> Hello Mika, Rafael, Greg,
>>>
>>> Hi,
>>>
>>>> Would it be possible to include the following two patches in 
>>>> 4.9-stable:
>>>>  - "ACPI / watchdog: Prefer iTCO_wdt on Lenovo Z50-70"
>>>>  - "ACPI / watchdog: Prefer iTCO_wdt always when WDAT table uses RTC 
>>>> SRAM"
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=a0a37862a4e1844793d39aca9ccb8fecbdcb8659 
>>>>
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=5a802a7a285c8877ca872e44eeb0f06afcb5212f 
>>>>
>>>>
>>>> Context: I just upgrade one of my servers from 4.4.161 to 4.9.137 and
>>>> run into a problem of not working RTC and watchdog. Adding these two
>>>> patches fixed the issue. No changes were necessary for them to be 
>>>> applied.
>>>
>>> I think the best way to get these included in stable trees is to send
>>> the commit ids with the above explanation to stable@vger.kernel.org.
>>
>> Thank you Mika! I forgot how the process works. :/
>>
>> The commits are:
>> a0a37862a4e1844793d39aca9ccb8fecbdcb8659
>> 5a802a7a285c8877ca872e44eeb0f06afcb5212f
>>
>> It also looks like the first patch is already in 4.14-stable, just not 
>> in 4.9.
>> - a0a37862a4e1844793d39aca9ccb8fecbdcb8659 was included in 4.14.51:
>> https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.51
>>
>> However, it does not look like the 2nd one has been included in 4.14 
>> yet. Would it be then possible to add 
>> 5a802a7a285c8877ca872e44eeb0f06afcb5212f to both 4.9-stable and 
>> 4.14-stable?
>>
>> The impacted system is:
>>  Dell Inc. PowerEdge T110 II/0PM2CW, BIOS 2.10.0 05/24/2018
>>
>> Krzysztof
> 
> Okay, I've queued the second commit to 4.14, and both to 4.9.
> 
> What about older stable kernels?

Perfect, thank you so much!

I think older kernels should be fine, like I said - everything worked 
under 4.4-stable. I suspect this is because of some ACPI / WDAT 
improvements in 4.9, or between 4.5 - 4.8 for which we no longer support 
-stable. Mika, do you know which change exactly introduce this side effect?

Thanks,
  Krzysztof