linux-kernel - Re: [1/2] cpufreq: dt-platdev: Automatically create cpufreq device with OPP v2

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Date:   Mon, 11 Sep 2017 17:43:58 +0530
From:   Keerthy <j-keerthy@...com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Simon Horman <horms@...ge.net.au>,
        Dave Gerlach <d-gerlach@...com>
CC:     Rafael Wysocki <rjw@...ysocki.net>, <linux-pm@...r.kernel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        <geert@...ux-m68k.org>, <maxime.ripard@...e-electrons.com>,
        <wens@...e.org>, <xuwei5@...ilicon.com>, <kgene@...nel.org>,
        <krzk@...nel.org>, <yamada.masahiro@...ionext.com>,
        <jun.nie@...aro.org>, <baoyou.xie@...aro.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [1/2] cpufreq: dt-platdev: Automatically create cpufreq device
 with OPP v2



On Tuesday 29 August 2017 03:41 PM, Viresh Kumar wrote:
> On 21-08-17, 15:17, Simon Horman wrote:
>> Sorry, I seem to have accidently sent this email as Virish rather than
>> myself. I will try again.
> 
> No issues. I see that Rafael has already applied my patches, you can send
> additional patches over that to make sure everything is clear.

Viresh,

I see below warning with this patch on am57xx-beagle

[    3.545247] WARNING: CPU: 1 PID: 1 at fs/sysfs/dir.c:31
sysfs_warn_dup+0x58/0x78
[    3.553099] sysfs: cannot create duplicate filename
'/devices/platform/cpufreq-dt'
[    3.561126] Modules linked in:
[    3.564402] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W
4.13.0-next-20170911-12690-ga31cc45-dirty #7
[    3.575071] Hardware name: Generic DRA74X (Flattened Device Tree)
[    3.581484] [<c0110a88>] (unwind_backtrace) from [<c010cae4>]
(show_stack+0x10/0x14)
[    3.589620] [<c010cae4>] (show_stack) from [<c0828184>]
(dump_stack+0xac/0xe0)
[    3.597209] [<c0828184>] (dump_stack) from [<c01374d0>]
(__warn+0xd8/0x104)
[    3.604532] [<c01374d0>] (__warn) from [<c0137530>]
(warn_slowpath_fmt+0x34/0x44)
[    3.612390] [<c0137530>] (warn_slowpath_fmt) from [<c0345b30>]
(sysfs_warn_dup+0x58/0x78)
[    3.620988] [<c0345b30>] (sysfs_warn_dup) from [<c0345c18>]
(sysfs_create_dir_ns+0x80/0x98)
[    3.629773] [<c0345c18>] (sysfs_create_dir_ns) from [<c082c974>]
(kobject_add_internal+0x9c/0x2d4)
[    3.639177] [<c082c974>] (kobject_add_internal) from [<c082cbf8>]
(kobject_add+0x4c/0x9c)
[    3.647764] [<c082cbf8>] (kobject_add) from [<c05805a8>]
(device_add+0xcc/0x57c)
[    3.655542] [<c05805a8>] (device_add) from [<c0584d38>]
(platform_device_add+0x100/0x220)
[    3.664138] [<c0584d38>] (platform_device_add) from [<c058576c>]
(platform_device_register_full+0xf4/0x118)
[    3.674378] [<c058576c>] (platform_device_register_full) from
[<c0670514>] (ti_cpufreq_init+0x150/0x22c)
[    3.684326] [<c0670514>] (ti_cpufreq_init) from [<c0101df4>]
(do_one_initcall+0x3c/0x170)
[    3.692916] [<c0101df4>] (do_one_initcall) from [<c0c00eb4>]
(kernel_init_freeable+0x1fc/0x2c4)
[    3.702049] [<c0c00eb4>] (kernel_init_freeable) from [<c083c0cc>]
(kernel_init+0x8/0x110)
[    3.710639] [<c083c0cc>] (kernel_init) from [<c0107d78>]
(ret_from_fork+0x14/0x3c)
[    3.718680] ---[ end trace 33482508cbb50156 ]---
[    3.720850] ata1: SATA link down (SStatus 0 SControl 300)
[    3.729278] ------------[ cut here ]------------
[    3.734147] WARNING: CPU: 1 PID: 1 at lib/kobject.c:240
kobject_add_internal+0x254/0x2d4
[    3.742709] kobject_add_internal failed for cpufreq-dt with -EEXIST,
don't try to register things with the same name in the same directory.
[    3.755900] Modules linked in:
[    3.759239] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W
4.13.0-next-20170911-12690-ga31cc45-dirty #7
[    3.769907] Hardware name: Generic DRA74X (Flattened Device Tree)
[    3.776321] [<c0110a88>] (unwind_backtrace) from [<c010cae4>]
(show_stack+0x10/0x14)
[    3.784454] [<c010cae4>] (show_stack) from [<c0828184>]
(dump_stack+0xac/0xe0)
[    3.792043] [<c0828184>] (dump_stack) from [<c01374d0>]
(__warn+0xd8/0x104)
[    3.799364] [<c01374d0>] (__warn) from [<c0137530>]
(warn_slowpath_fmt+0x34/0x44)
[    3.807227] [<c0137530>] (warn_slowpath_fmt) from [<c082cb2c>]
(kobject_add_internal+0x254/0x2d4)
[    3.816552] [<c082cb2c>] (kobject_add_internal) from [<c082cbf8>]
(kobject_add+0x4c/0x9c)
[    3.825139] [<c082cbf8>] (kobject_add) from [<c05805a8>]
(device_add+0xcc/0x57c)
[    3.832913] [<c05805a8>] (device_add) from [<c0584d38>]
(platform_device_add+0x100/0x220)
[    3.841504] [<c0584d38>] (platform_device_add) from [<c058576c>]
(platform_device_register_full+0xf4/0x118)
[    3.851729] [<c058576c>] (platform_device_register_full) from
[<c0670514>] (ti_cpufreq_init+0x150/0x22c)
[    3.861686] [<c0670514>] (ti_cpufreq_init) from [<c0101df4>]
(do_one_initcall+0x3c/0x170)
[    3.870273] [<c0101df4>] (do_one_initcall) from [<c0c00eb4>]
(kernel_init_freeable+0x1fc/0x2c4)
[    3.879412] [<c0c00eb4>] (kernel_init_freeable) from [<c083c0cc>]
(kernel_init+0x8/0x110)
[    3.888002] [<c083c0cc>] (kernel_init) from [<c0107d78>]
(ret_from_fork+0x14/0x3c)
[    3.896035] ---[ end trace 33482508cbb50157 ]---

I believe in two places platform_device_register_* calls are made with
the same name 'cpufreq-dt'

First place is: cpufreq_dt_platdev_init and the other i believe is
ti_cpufreq_init.

Dave,

Should the ti-cpufreq driver also be calling
platform_device_register_simple?

Regards,
Keerthy

>