linux-kernel - Re: [PATCH 5.4 1/2] hwmon: Introduce hwmon_device_register_for

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Date:   Wed, 22 Jun 2022 12:12:45 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Julian Haller <julian.haller@...lips.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 5.4 1/2] hwmon: Introduce
 hwmon_device_register_for_thermal

On Wed, Jun 22, 2022 at 06:09:39PM +0200, Greg KH wrote:
>On Wed, Jun 22, 2022 at 08:44:54AM -0700, Guenter Roeck wrote:
>> On Wed, Jun 22, 2022 at 05:39:50PM +0200, Julian Haller wrote:
>> > > On Wed, Jun 22, 2022 at 04:49:01PM +0200, Julian Haller wrote:
>> > > > From: Guenter Roeck <linux@...ck-us.net>
>> > > >
>> > > > [ upstream commit e5d21072054fbadf41cd56062a3a14e447e8c22b ]
>> > > >
>> > > > The thermal subsystem registers a hwmon driver without providing
>> > > > chip or sysfs group information. This is for legacy reasons and
>> > > > would be difficult to change. At the same time, we want to enforce
>> > > > that chip information is provided when registering a hwmon device
>> > > > using hwmon_device_register_with_info(). To enable this, introduce
>> > > > a special API for use only by the thermal subsystem.
>> > > >
>> > > > Acked-by: Rafael J . Wysocki <rafael@...nel.org>
>> > > > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
>> > >
>> > > What is the point of applying those patches to the 5.4 kernel ?
>> > > This was intended for use with new code, not for stable releases.
>> > >
>> > > Guenter
>> >
>> > The upstream commit ddaefa209c4ac791c1262e97c9b2d0440c8ef1d5 ("hwmon: Make chip
>> > parameter for with_info API mandatory") was backported to the 5.4 kernel as
>> > part of v5.4.198, see commit 1ec0bc72f5dab3ab367ae5230cf6f212d805a225. This
>> > breaks the hwmon device registration in the thermal drivers as these two
>> > patches here have been left out. We either need to include them as well or
>> > revert the original commit.
>> >
>> > I'm also not sure why the original commit found its way into the 5.4 stable
>> > branch.
>> >
>>
>> I had complained about this backport to other branches before. That patch
>> was not a bug fix, it was neither intended nor marked for stable releases,
>> and it should be reverted from all stable branches.
>
>Yes, that's not right, let me go revert that.  Odd that it only went
>into 4.19 and 5.4, I think Sasha's scripts went wonky there...

Yes, I definitely remember dropping it - not sure how it ended up on
those two kernels. I'll dig into what happened here. sorry :(

-- 
Thanks,
Sasha