linux-kernel - Re: [PATCH v2] drivers: base: add support to skip power management in device/driver model

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Date:   Thu, 14 Feb 2019 10:29:53 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Eugeniu Rosca <erosca@...adit-jv.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jisheng Zhang <jszhang@...vell.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Joshua Frkuska <joshua_frkuska@...tor.com>,
        Eugeniu Rosca <roscaeugeniu@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v2] drivers: base: add support to skip power management
 in device/driver model

On Wed, Feb 13, 2019 at 11:38:49PM +0100, Eugeniu Rosca wrote:
> Hello Sudeep,
>
> I appreciate your efforts. Currently, this patch generates below
> warnings during s2ram on R-Car H3-Salvator-X:
>
> [ 46.874214] PM: suspend entry (deep)
> [ 46.878211] PM: Syncing filesystems ... done.
> [ 46.989148] Freezing user space processes ... (elapsed 0.004 seconds) done.
> [ 47.000428] OOM killer disabled.
> [ 47.003895] Freezing remaining freezable tasks ... (elapsed 0.003 seconds) done.
> [ 47.226363] PM: suspend devices took 0.210 seconds
> [ 47.280553] Disabling non-boot CPUs ...
> [ 47.289157] ------------[ cut here ]------------
> [ 47.294524] sysfs group 'power' not found for kobject 'index0'
> [ 47.300622] WARNING: CPU: 1 PID: 14 at fs/sysfs/group.c:256 sysfs_remove_group+0x78/0xc4
> ---snip---
> [ 47.550425] sysfs group 'power' not found for kobject 'index1'
> ---snip---
> [ 47.807005] sysfs group 'power' not found for kobject 'index2'
> ---snip---
> [ 48.063703] sysfs group 'power' not found for kobject 'cache'
> ---snip---
>

Thanks for the report, looks like I am not able to reproduce this, will
check if I am missing something while testing.

> Complete log and .config are shared in
> https://gist.github.com/erosca/da9ea551033a503121de61049d77b834
>

Thanks again, much appreciated for providing full log.

--
Regards,
Sudeep