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Date:   Tue, 22 Jan 2019 16:05:45 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Stephen Boyd <swboyd@...omium.org>, andy.gross@...aro.org,
        david.brown@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH] soc: qcom: update config dependencies for QCOM_RPMPD


On 1/22/2019 3:38 PM, Viresh Kumar wrote:
> On 22-01-19, 15:24, Rajendra Nayak wrote:
>> I was doing some quick testing by adding the calls to of_genpd_remove_last() as
>> suggested by Ulf for cleaning up the genpd registrations, and I run into this
>> backtrace when the driver re-probes followed by a remove
>>
>> [   59.204525] kobject ((____ptrval____)): tried to init an initialized object, something is seriously wr.
>> [   59.214262] CPU: 3 PID: 1600 Comm: sh Not tainted 5.0.0-rc1-00012-g0513915837c5-dirty #32
>> [   59.222500] Hardware name: Qualcomm Technologies, Inc. SDM845 MTP (DT)
>> [   59.229081] Call trace:
>> [   59.231574]  dump_backtrace+0x0/0x148
>> [   59.235276]  show_stack+0x14/0x20
>> [   59.238631]  dump_stack+0x8c/0xac
>> [   59.241980]  kobject_init+0x8c/0xa0
>> [   59.245506]  device_initialize+0x34/0xc8
>> [   59.249474]  pm_genpd_init+0x170/0x260
>> [   59.253261]  rpmhpd_probe+0x194/0x2b0
>> [   59.256966]  platform_drv_probe+0x4c/0xa8
>> [   59.261011]  really_probe+0x1e4/0x2c8
>> [   59.264711]  driver_probe_device+0x58/0x10
>> [   59.268927]  bind_store+0xdc/0x178
>> [   59.272356]  drv_attr_store+0x20/0x30
>> [   59.276061]  sysfs_kf_write+0x48/0x58
>> [   59.279760]  kernfs_fop_write+0xcc/0x1c8
>> [   59.283728]  __vfs_write+0x34/0x170
>> [   59.287245]  vfs_write+0xa8/0x1b8
>> [   59.290592]  ksys_write+0x5c/0xc8
>> [   59.293941]  __arm64_sys_write+0x14/0x20
>> [   59.297897]  el0_svc_common+0xb4/0x118
>> [   59.301676]  el0_svc_handler+0x2c/0x80
>> [   59.305455]  el0_svc+0x8/0xc
>>
>> Viresh/Ulf, looks like we need some cleanup of whats done by device_initialize()
>> in pm_genpd_init() to happen as part of the pm_genpd_remove()?
> 
> Yeah, we normally need to call put_device() for that. Maybe something like this:
> 
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 500de1dee967..d5b984f042ec 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -1812,6 +1812,7 @@ static int genpd_remove(struct generic_pm_domain *genpd)
>          genpd_unlock(genpd);
>          cancel_work_sync(&genpd->power_off_work);
>          kfree(genpd->free);
> +       put_device(&genpd->dev);
>          pr_debug("%s: removed %s\n", __func__, genpd->name);
>   
>          return 0;

Seeing this now during remove

[   34.008216] ------------[ cut here ]------------
[   34.012894] Device 'mss' does not have a release() function, it is broken and must be fixed. See Docum.
[   34.024143] WARNING: CPU: 6 PID: 1600 at drivers/base/core.c:922 device_release+0x84/0x98
[   34.032379] Modules linked in:
[   34.035477] CPU: 6 PID: 1600 Comm: sh Not tainted 5.0.0-rc1-00012-g0513915837c5-dirty #34
[   34.043724] Hardware name: Qualcomm Technologies, Inc. SDM845 MTP (DT)
[   34.050305] pstate: 60400005 (nZCv daif +PAN -UAO)
[   34.055141] pc : device_release+0x84/0x98
[   34.059186] lr : device_release+0x84/0x98
[   34.063229] sp : ffff0000183c3b40
[   34.066574] x29: ffff0000183c3b40 x28: ffff800174b55100
[   34.071930] x27: 0000000000000000 x26: 0000000000000000
[   34.077285] x25: 0000000056000000 x24: 0000000000000015
[   34.082640] x23: dead000000000100 x22: dead000000000200
[   34.087997] x21: 0000000000000000 x20: ffff0000112f9780
[   34.093352] x19: ffff0000112f9770 x18: ffff0000111dd6c8
[   34.098719] x17: 0000000000000000 x16: 0000000000000000
[   34.104072] x15: ffff0000983c3867 x14: 6966206562207473
[   34.109438] x13: 756d20646e61206e x12: 656b6f7262207369
[   34.114791] x11: 207469202c6e6f69 x10: 74636e7566202928
[   34.120147] x9 : 657361656c657220 x8 : 742e7463656a626f
[   34.125514] x7 : 6b2f6e6f69746174 x6 : 0000000000000149
[   34.130867] x5 : 0000000000000020 x4 : 000000000001c200
[   34.136223] x3 : 00000000ffffffff x2 : ffff0000111f5828
[   34.141579] x1 : bc1d8ed5415ab200 x0 : 0000000000000000
[   34.146936] Call trace:
[   34.149413]  device_release+0x84/0x98
[   34.153116]  kobject_put+0x98/0xe8
[   34.156551]  put_device+0x14/0x28
[   34.159899]  genpd_remove+0x108/0x190
[   34.163598]  of_genpd_remove_last+0xbc/0xf0
[   34.167828]  rpmhpd_remove+0x2c/0x48
[   34.171436]  platform_drv_remove+0x24/0x68
[   34.175574]  device_release_driver_internal+0x184/0x218
[   34.180845]  device_release_driver+0x14/0x20
[   34.185152]  unbind_store+0xec/0x138
[   34.188760]  drv_attr_store+0x20/0x30
[   34.192465]  sysfs_kf_write+0x48/0x58
[   34.196163]  kernfs_fop_write+0xcc/0x1c8
[   34.200129]  __vfs_write+0x34/0x170
[   34.203654]  vfs_write+0xa8/0x1b8
[   34.206998]  ksys_write+0x5c/0xc8
[   34.210345]  __arm64_sys_write+0x14/0x20
[   34.214318]  el0_svc_common+0xb4/0x118
[   34.218107]  el0_svc_handler+0x2c/0x80
[   34.221899]  el0_svc+0x8/0xc
[   34.224804] ---[ end trace 9cee1458d0b6c175 ]---
[   34.229490] ------------[ cut here ]------------

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