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Groups > linux.kernel > #1479760 > unrolled thread

[BUG] mfd: wm8994: kenel WARN and crashes

Started byViresh Kumar <viresh.kumar@linaro.org>
First post2016-09-09 10:50 +0200
Last post2016-09-09 13:30 +0200
Articles 11 — 3 participants

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Contents

  [BUG] mfd: wm8994: kenel WARN and crashes Viresh Kumar <viresh.kumar@linaro.org> - 2016-09-09 10:50 +0200
    Re: [BUG] mfd: wm8994: kenel WARN and crashes Mark Brown <broonie@kernel.org> - 2016-09-09 12:20 +0200
      Re: [BUG] mfd: wm8994: kenel WARN and crashes Viresh Kumar <viresh.kumar@linaro.org> - 2016-09-09 12:30 +0200
        Re: [BUG] mfd: wm8994: kenel WARN and crashes Mark Brown <broonie@kernel.org> - 2016-09-09 13:30 +0200
          Re: [BUG] mfd: wm8994: kenel WARN and crashes Joe Perches <joe@perches.com> - 2016-09-09 13:50 +0200
            Re: [BUG] mfd: wm8994: kenel WARN and crashes Mark Brown <broonie@kernel.org> - 2016-09-09 13:50 +0200
              Re: [BUG] mfd: wm8994: kenel WARN and crashes Joe Perches <joe@perches.com> - 2016-09-09 14:00 +0200
                Re: [BUG] mfd: wm8994: kenel WARN and crashes Mark Brown <broonie@kernel.org> - 2016-09-09 14:10 +0200
        Re: [BUG] mfd: wm8994: kenel WARN and crashes Viresh Kumar <viresh.kumar@linaro.org> - 2016-09-09 13:30 +0200
        Re: [BUG] mfd: wm8994: kenel WARN and crashes Mark Brown <broonie@kernel.org> - 2016-09-09 13:30 +0200
    Re: [BUG] mfd: wm8994: kenel WARN and crashes Viresh Kumar <viresh.kumar@linaro.org> - 2016-09-09 13:30 +0200

#1479760 — [BUG] mfd: wm8994: kenel WARN and crashes

FromViresh Kumar <viresh.kumar@linaro.org>
Date2016-09-09 10:50 +0200
Subject[BUG] mfd: wm8994: kenel WARN and crashes
Message-ID<sfpFw-zV-17@gated-at.bofh.it>
Hi Guys,

Didn't had much time to investigate and so just reporting the issue
for now.

My dual core exynos (A15) crashes while booting with following
logs..

[    2.150076] wm8994 3-001a: Device is not a WM8994, ID is 0
[    2.154289] ------------[ cut here ]------------
[    2.158738] WARNING: CPU: 1 PID: 1 at
/mnt/ssd/all/work/repos/devel/linux/drivers/regulator/core.c:4072
regulator_unregister+0xc8/0xd0
[    2.170806] Modules linked in:
[    2.173793] CPU: 1 PID: 1 Comm: swapper/0 Not tainted
4.8.0-rc4-00085-g32f3101535ae-dirty #20
[    2.182310] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[    2.188396] [<c010e2d0>] (unwind_backtrace) from [<c010af30>]
(show_stack+0x10/0x14)
[    2.196120] [<c010af30>] (show_stack) from [<c0329ce4>]
(dump_stack+0x88/0x9c)
[    2.203321] [<c0329ce4>] (dump_stack) from [<c011a958>] (__warn+0xe8/0x100)
[    2.210255] [<c011a958>] (__warn) from [<c011aa20>]
(warn_slowpath_null+0x20/0x28)
[    2.217815] [<c011aa20>] (warn_slowpath_null) from [<c0384534>]
(regulator_unregister+0xc8/0xd0)
[    2.226586] [<c0384534>] (regulator_unregister) from [<c040692c>]
(release_nodes+0x16c/0x1dc)
[    2.235094] [<c040692c>] (release_nodes) from [<c0403ea0>]
(__device_release_driver+0x8c/0x110)
[    2.243772] [<c0403ea0>] (__device_release_driver) from
[<c0403f40>] (device_release_driver+0x1c/0x28)
[    2.253060] [<c0403f40>] (device_release_driver) from [<c0403000>]
(bus_remove_device+0xd8/0x104)
[    2.261912] [<c0403000>] (bus_remove_device) from [<c04001b4>]
(device_del+0x10c/0x218)
[    2.269896] [<c04001b4>] (device_del) from [<c0405328>]
(platform_device_del+0x1c/0x88)
[    2.277881] [<c0405328>] (platform_device_del) from [<c04053a0>]
(platform_device_unregister+0xc/0x20)
[    2.287173] [<c04053a0>] (platform_device_unregister) from
[<c0428a20>] (mfd_remove_devices_fn+0x5c/0x64)
[    2.296720] [<c0428a20>] (mfd_remove_devices_fn) from [<c03ffeb4>]
(device_for_each_child_reverse+0x4c/0x78)
[    2.306528] [<c03ffeb4>] (device_for_each_child_reverse) from
[<c0428724>] (mfd_remove_devices+0x20/0x30)
[    2.316076] [<c0428724>] (mfd_remove_devices) from [<c04273ec>]
(wm8994_device_init+0x2ac/0x7f0)
[    2.324845] [<c04273ec>] (wm8994_device_init) from [<c04f127c>]
(i2c_device_probe+0x178/0x1fc)
[    2.333436] [<c04f127c>] (i2c_device_probe) from [<c0403bd8>]
(driver_probe_device+0x214/0x2c0)
[    2.342116] [<c0403bd8>] (driver_probe_device) from [<c0403d30>]
(__driver_attach+0xac/0xb0)
[    2.350535] [<c0403d30>] (__driver_attach) from [<c0401f50>]
(bus_for_each_dev+0x68/0x9c)
[    2.358693] [<c0401f50>] (bus_for_each_dev) from [<c04031cc>]
(bus_add_driver+0x1a0/0x218)
[    2.366940] [<c04031cc>] (bus_add_driver) from [<c0404548>]
(driver_register+0x78/0xf8)
[    2.374928] [<c0404548>] (driver_register) from [<c04f1e74>]
(i2c_register_driver+0x34/0x84)
[    2.383345] [<c04f1e74>] (i2c_register_driver) from [<c01017d0>]
(do_one_initcall+0x40/0x170)
[    2.391854] [<c01017d0>] (do_one_initcall) from [<c0a00dbc>]
(kernel_init_freeable+0x15c/0x1fc)
[    2.400533] [<c0a00dbc>] (kernel_init_freeable) from [<c06de010>]
(kernel_init+0x8/0x114)
[    2.408691] [<c06de010>] (kernel_init) from [<c0107978>]
(ret_from_fork+0x14/0x3c)
[    2.416285] ---[ end trace cdae3f0945a6102d ]---
[    2.421160] ------------[ cut here ]------------
[    2.425469] WARNING: CPU: 1 PID: 1 at
/mnt/ssd/all/work/repos/devel/linux/drivers/regulator/core.c:4072
regulator_unregister+0xc8/0xd0
[    2.437541] Modules linked in:
[    2.440529] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W
4.8.0-rc4-00085-g32f3101535ae-dirty #20
[    2.450262] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[    2.456338] [<c010e2d0>] (unwind_backtrace) from [<c010af30>]
(show_stack+0x10/0x14)
[    2.464069] [<c010af30>] (show_stack) from [<c0329ce4>]
(dump_stack+0x88/0x9c)
[    2.471271] [<c0329ce4>] (dump_stack) from [<c011a958>] (__warn+0xe8/0x100)
[    2.478206] [<c011a958>] (__warn) from [<c011aa20>]
(warn_slowpath_null+0x20/0x28)
[    2.485767] [<c011aa20>] (warn_slowpath_null) from [<c0384534>]
(regulator_unregister+0xc8/0xd0)
[    2.494535] [<c0384534>] (regulator_unregister) from [<c040692c>]
(release_nodes+0x16c/0x1dc)
[    2.503044] [<c040692c>] (release_nodes) from [<c0403ea0>]
(__device_release_driver+0x8c/0x110)
[    2.511724] [<c0403ea0>] (__device_release_driver) from
[<c0403f40>] (device_release_driver+0x1c/0x28)
[    2.521011] [<c0403f40>] (device_release_driver) from [<c0403000>]
(bus_remove_device+0xd8/0x104)
[    2.529863] [<c0403000>] (bus_remove_device) from [<c04001b4>]
(device_del+0x10c/0x218)
[    2.537847] [<c04001b4>] (device_del) from [<c0405328>]
(platform_device_del+0x1c/0x88)
[    2.545832] [<c0405328>] (platform_device_del) from [<c04053a0>]
(platform_device_unregister+0xc/0x20)
[    2.555122] [<c04053a0>] (platform_device_unregister) from
[<c0428a20>] (mfd_remove_devices_fn+0x5c/0x64)
[    2.564671] [<c0428a20>] (mfd_remove_devices_fn) from [<c03ffeb4>]
(device_for_each_child_reverse+0x4c/0x78)
[    2.574479] [<c03ffeb4>] (device_for_each_child_reverse) from
[<c0428724>] (mfd_remove_devices+0x20/0x30)
[    2.584027] [<c0428724>] (mfd_remove_devices) from [<c04273ec>]
(wm8994_device_init+0x2ac/0x7f0)
[    2.592794] [<c04273ec>] (wm8994_device_init) from [<c04f127c>]
(i2c_device_probe+0x178/0x1fc)
[    2.601387] [<c04f127c>] (i2c_device_probe) from [<c0403bd8>]
(driver_probe_device+0x214/0x2c0)
[    2.610067] [<c0403bd8>] (driver_probe_device) from [<c0403d30>]
(__driver_attach+0xac/0xb0)
[    2.618486] [<c0403d30>] (__driver_attach) from [<c0401f50>]
(bus_for_each_dev+0x68/0x9c)
[    2.626645] [<c0401f50>] (bus_for_each_dev) from [<c04031cc>]
(bus_add_driver+0x1a0/0x218)
[    2.634892] [<c04031cc>] (bus_add_driver) from [<c0404548>]
(driver_register+0x78/0xf8)
[    2.642877] [<c0404548>] (driver_register) from [<c04f1e74>]
(i2c_register_driver+0x34/0x84)
[    2.651296] [<c04f1e74>] (i2c_register_driver) from [<c01017d0>]
(do_one_initcall+0x40/0x170)
[    2.659803] [<c01017d0>] (do_one_initcall) from [<c0a00dbc>]
(kernel_init_freeable+0x15c/0x1fc)
[    2.668484] [<c0a00dbc>] (kernel_init_freeable) from [<c06de010>]
(kernel_init+0x8/0x114)
[    2.676641] [<c06de010>] (kernel_init) from [<c0107978>]
(ret_from_fork+0x14/0x3c)
[    2.684276] ---[ end trace cdae3f0945a6102e ]---
[    2.689173] Unable to handle kernel NULL pointer dereference at
virtual address 00000078
[    2.696897] pgd = c0004000
[    2.699539] [00000078] *pgd=00000000
[    2.703100] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[    2.708395] Modules linked in:
[    2.711431] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W
4.8.0-rc4-00085-g32f3101535ae-dirty #20
[    2.721165] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[    2.727232] task: ee874000 task.stack: ee878000
[    2.731749] PC is at down_write+0x14/0x54
[    2.735741] LR is at debugfs_remove_recursive+0x30/0x150
[    2.741034] pc : [<c06e20fc>]    lr : [<c02e9468>]    psr: 80000013
[    2.741034] sp : ee879e18  ip : 2e583000  fp : 00000000
[    2.752502] r10: 00000000  r9 : c04064fc  r8 : ee444be0
[    2.757698] r7 : ee444c64  r6 : ee444c30  r5 : ee444be0  r4 : 00000078
[    2.764208] r3 : ffff0001  r2 : 00000000  r1 : 00000001  r0 : 00000078
[    2.770720] Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[    2.777837] Control: 10c5387d  Table: 4000406a  DAC: 00000051
[    2.783564] Process swapper/0 (pid: 1, stack limit = 0xee878210)
[    2.789554] Stack: (0xee879e18 to 0xee87a000)
[    2.793894] 9e00:
    ee15d280 c02e9468
[    2.802066] 9e20: ee15d280 ee152400 0000000d eea22820 ee879e58
c03826a0 c0b1505c ee15d280
[    2.810224] 9e40: 0000000d c0382744 ee15d240 ee15d140 0000000d
c040692c ee1e7200 ee15d640
[    2.818383] 9e60: eea22820 c0b81c4c c0b81c54 c0b22320 ffffffea
00000000 00000000 c0403ab0
[    2.826543] 9e80: eea22820 c0b22320 eea22854 c0b2a950 c0b44000
000000d8 00000000 c0403d30
[    2.834702] 9ea0: 00000000 c0b22320 c0403c84 c0401f50 ee97be74
eea174c0 c0b22320 ee16ec00
[    2.842861] 9ec0: 00000000 c04031cc c08a4c5c c0a1d418 c0a34840
c0b22320 c0a1d418 c0a34840
[    2.851020] 9ee0: c0b44000 c0404548 c0b22304 c0a1d418 c0a34840
c04f1e74 c0a5fe60 c0a1d418
[    2.859179] 9f00: c0a34840 c01017d0 c0b0ac18 ee879f18 c0b45fe8
c06e17a0 60000000 c0b0958c
[    2.867338] 9f20: 00000000 c0b0958c efffca46 c0716b40 efffca42
c0135074 0000cccd 00000000
[    2.875498] 9f40: c08cd618 00000000 00000006 00000006 c0b09568
efffc940 c0a5fe60 00000006
[    2.883657] 9f60: c0a34840 c0b44000 c0b44000 000000d8 c0a34848
c0a00dbc 00000006 00000006
[    2.891816] 9f80: 00000000 c0a005a0 00000000 c06de008 00000000
00000000 00000000 00000000
[    2.899975] 9fa0: 00000000 c06de010 00000000 c0107978 00000000
00000000 00000000 00000000
[    2.908134] 9fc0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[    2.916293] 9fe0: 00000000 00000000 00000000 00000000 00000013
00000000 ffffffff ffffffff
[    2.924457] [<c06e20fc>] (down_write) from [<c02e9468>]
(debugfs_remove_recursive+0x30/0x150)
[    2.932964] [<c02e9468>] (debugfs_remove_recursive) from
[<c03826a0>] (_regulator_put+0x24/0xac)
[    2.941728] [<c03826a0>] (_regulator_put) from [<c0382744>]
(regulator_put+0x1c/0x2c)
[    2.949540] [<c0382744>] (regulator_put) from [<c040692c>]
(release_nodes+0x16c/0x1dc)
[    2.957440] [<c040692c>] (release_nodes) from [<c0403ab0>]
(driver_probe_device+0xec/0x2c0)
[    2.965773] [<c0403ab0>] (driver_probe_device) from [<c0403d30>]
(__driver_attach+0xac/0xb0)
[    2.974192] [<c0403d30>] (__driver_attach) from [<c0401f50>]
(bus_for_each_dev+0x68/0x9c)
[    2.982351] [<c0401f50>] (bus_for_each_dev) from [<c04031cc>]
(bus_add_driver+0x1a0/0x218)
[    2.990597] [<c04031cc>] (bus_add_driver) from [<c0404548>]
(driver_register+0x78/0xf8)
[    2.998583] [<c0404548>] (driver_register) from [<c04f1e74>]
(i2c_register_driver+0x34/0x84)
[    3.007003] [<c04f1e74>] (i2c_register_driver) from [<c01017d0>]
(do_one_initcall+0x40/0x170)
[    3.015509] [<c01017d0>] (do_one_initcall) from [<c0a00dbc>]
(kernel_init_freeable+0x15c/0x1fc)
[    3.024189] [<c0a00dbc>] (kernel_init_freeable) from [<c06de010>]
(kernel_init+0x8/0x114)
[    3.032349] [<c06de010>] (kernel_init) from [<c0107978>]
(ret_from_fork+0x14/0x3c)
[    3.039898] Code: e1a04000 f590f000 e3a03001 e34f3fff (e1902f9f)
[    3.046011] ---[ end trace cdae3f0945a6102f ]---
[    3.050611] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0000000b
[    3.050611]

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#1479835

FromMark Brown <broonie@kernel.org>
Date2016-09-09 12:20 +0200
Message-ID<sfr4C-1xy-15@gated-at.bofh.it>
In reply to#1479760

[Multipart message — attachments visible in raw view] — view raw

On Fri, Sep 09, 2016 at 02:19:35PM +0530, Viresh Kumar wrote:

> Didn't had much time to investigate and so just reporting the issue
> for now.

You probably want to contact the wm8994 maintainers regarding issues
with the wm8994 driver...

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#1479856

FromViresh Kumar <viresh.kumar@linaro.org>
Date2016-09-09 12:30 +0200
Message-ID<sfrei-1AG-31@gated-at.bofh.it>
In reply to#1479835
On 09-09-16, 11:14, Mark Brown wrote:
> On Fri, Sep 09, 2016 at 02:19:35PM +0530, Viresh Kumar wrote:
> 
> > Didn't had much time to investigate and so just reporting the issue
> > for now.
> 
> You probably want to contact the wm8994 maintainers regarding issues
> with the wm8994 driver...

Sure, but I couldn't find who the maintainer is. Neither was
MAINTAINERS file of any help, nor was get-maintainers script.

The first commit shows this:

commit 9e50108668a70a9927257298bd4e679300124420
Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date:   Fri Jan 29 18:20:29 2010 +0000

    mfd: Add initial WM8994 support
    
    The WM8994 is a highly integrated ultra low power audio hub CODEC.
    Since it includes on-board regulators and GPIOs it is represented
    as a multi-function device, though the overwhelming majority of
    the functionality is provided by the ASoC CODEC driver.
    
    Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
    Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>


Isn't this you?

-- 
viresh

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#1479893

FromMark Brown <broonie@kernel.org>
Date2016-09-09 13:30 +0200
Message-ID<sfsam-2aJ-3@gated-at.bofh.it>
In reply to#1479856

[Multipart message — attachments visible in raw view] — view raw

On Fri, Sep 09, 2016 at 03:50:45PM +0530, Viresh Kumar wrote:
> On 09-09-16, 11:14, Mark Brown wrote:

> > You probably want to contact the wm8994 maintainers regarding issues
> > with the wm8994 driver...

> Sure, but I couldn't find who the maintainer is. Neither was
> MAINTAINERS file of any help, nor was get-maintainers script.

So take a look at who's maintaining all the other ex-Wolfson drivers
now...  I've not worked for them for over three years.

WOLFSON MICROELECTRONICS DRIVERS
L:      patches@opensource.wolfsonmicro.com
T:      git https://github.com/CirrusLogic/linux-drivers.git

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#1479910

FromJoe Perches <joe@perches.com>
Date2016-09-09 13:50 +0200
Message-ID<sfstH-2h0-7@gated-at.bofh.it>
In reply to#1479893
On Fri, 2016-09-09 at 12:21 +0100, Mark Brown wrote:
> So take a look at who's maintaining all the other ex-Wolfson drivers
> now...  I've not worked for them for over three years.

Maybe update .mailmap
---
diff --git a/.mailmap b/.mailmap
index de22dae..7d0e815 100644
--- a/.mailmap
+++ b/.mailmap
@@ -96,6 +96,7 @@ Linas Vepstas <linas@austin.ibm.com>
 Linus Lüssing <linus.luessing@c0d3.blue> <linus.luessing@web.de>
 Linus Lüssing <linus.luessing@c0d3.blue> <linus.luessing@ascom.ch>
 Mark Brown <broonie@sirena.org.uk>
+Mark Brown <broonie@kernel.org> <broonie@opensource.wolfsonmicro.com>
 Matthieu CASTET <castet.matthieu@free.fr>
 Mauro Carvalho Chehab <mchehab@kernel.org> <mchehab@brturbo.com.br>
 Mauro Carvalho Chehab <mchehab@kernel.org> <maurochehab@gmail.com>

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#1479911

FromMark Brown <broonie@kernel.org>
Date2016-09-09 13:50 +0200
Message-ID<sfstH-2h0-19@gated-at.bofh.it>
In reply to#1479910

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On Fri, Sep 09, 2016 at 04:42:49AM -0700, Joe Perches wrote:
> On Fri, 2016-09-09 at 12:21 +0100, Mark Brown wrote:
> > So take a look at who's maintaining all the other ex-Wolfson drivers
> > now...  I've not worked for them for over three years.

> Maybe update .mailmap

Because...?

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#1479919

FromJoe Perches <joe@perches.com>
Date2016-09-09 14:00 +0200
Message-ID<sfsDn-2kg-11@gated-at.bofh.it>
In reply to#1479911
On Fri, 2016-09-09 at 12:49 +0100, Mark Brown wrote:
> On Fri, Sep 09, 2016 at 04:42:49AM -0700, Joe Perches wrote:
> > On Fri, 2016-09-09 at 12:21 +0100, Mark Brown wrote:
> > So take a look at who's maintaining all the other ex-Wolfson drivers
> > now...  I've not worked for them for over three years.
> > Maybe update .mailmap
> Because...?

git blame / git shortlog -e

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#1479927

FromMark Brown <broonie@kernel.org>
Date2016-09-09 14:10 +0200
Message-ID<sfsN4-2CZ-27@gated-at.bofh.it>
In reply to#1479919

[Multipart message — attachments visible in raw view] — view raw

On Fri, Sep 09, 2016 at 04:58:34AM -0700, Joe Perches wrote:
> On Fri, 2016-09-09 at 12:49 +0100, Mark Brown wrote:
> > On Fri, Sep 09, 2016 at 04:42:49AM -0700, Joe Perches wrote:
> > > On Fri, 2016-09-09 at 12:21 +0100, Mark Brown wrote:

> > > So take a look at who's maintaining all the other ex-Wolfson drivers
> > > now...  I've not worked for them for over three years.

> > > Maybe update .mailmap

Please fix your mail client, it's corrupting indentation levels.

> > Because...?

> git blame / git shortlog -e

The whole point of this discussion was that I'm not the person to go ask
about Wolfson drivers any more.

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#1479894

FromViresh Kumar <viresh.kumar@linaro.org>
Date2016-09-09 13:30 +0200
Message-ID<sfsam-2aJ-5@gated-at.bofh.it>
In reply to#1479856
On 09-09-16, 12:22, Mark Brown wrote:
> On Fri, Sep 09, 2016 at 03:50:45PM +0530, Viresh Kumar wrote:
> 
> > Sure, but I couldn't find who the maintainer is. Neither was
> > MAINTAINERS file of any help, nor was get-maintainers script.
> 
> Oh, and you've probably found a bug in get-maintainer since:
> 
> F:      drivers/mfd/wm*.c
> 
> is part of the file matching pattern there.

No, I missed that list as I was looking for people :(

I have added that list in cc now. Actually that looks like an email-id
only, instead of a list :)

-- 
viresh

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#1479896

FromMark Brown <broonie@kernel.org>
Date2016-09-09 13:30 +0200
Message-ID<sfsam-2aJ-7@gated-at.bofh.it>
In reply to#1479856

[Multipart message — attachments visible in raw view] — view raw

On Fri, Sep 09, 2016 at 03:50:45PM +0530, Viresh Kumar wrote:

> Sure, but I couldn't find who the maintainer is. Neither was
> MAINTAINERS file of any help, nor was get-maintainers script.

Oh, and you've probably found a bug in get-maintainer since:

F:      drivers/mfd/wm*.c

is part of the file matching pattern there.

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#1479895

FromViresh Kumar <viresh.kumar@linaro.org>
Date2016-09-09 13:30 +0200
Message-ID<sfsam-2aJ-11@gated-at.bofh.it>
In reply to#1479760
+ patches@opensource.wolfsonmicro.com

Thanks Mark for pointing me to that :)

On 9 September 2016 at 14:19, Viresh Kumar <viresh.kumar@linaro.org> wrote:
> Hi Guys,
>
> Didn't had much time to investigate and so just reporting the issue
> for now.
>
> My dual core exynos (A15) crashes while booting with following
> logs..
>
> [    2.150076] wm8994 3-001a: Device is not a WM8994, ID is 0
> [    2.154289] ------------[ cut here ]------------
> [    2.158738] WARNING: CPU: 1 PID: 1 at
> /mnt/ssd/all/work/repos/devel/linux/drivers/regulator/core.c:4072
> regulator_unregister+0xc8/0xd0
> [    2.170806] Modules linked in:
> [    2.173793] CPU: 1 PID: 1 Comm: swapper/0 Not tainted
> 4.8.0-rc4-00085-g32f3101535ae-dirty #20
> [    2.182310] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [    2.188396] [<c010e2d0>] (unwind_backtrace) from [<c010af30>]
> (show_stack+0x10/0x14)
> [    2.196120] [<c010af30>] (show_stack) from [<c0329ce4>]
> (dump_stack+0x88/0x9c)
> [    2.203321] [<c0329ce4>] (dump_stack) from [<c011a958>] (__warn+0xe8/0x100)
> [    2.210255] [<c011a958>] (__warn) from [<c011aa20>]
> (warn_slowpath_null+0x20/0x28)
> [    2.217815] [<c011aa20>] (warn_slowpath_null) from [<c0384534>]
> (regulator_unregister+0xc8/0xd0)
> [    2.226586] [<c0384534>] (regulator_unregister) from [<c040692c>]
> (release_nodes+0x16c/0x1dc)
> [    2.235094] [<c040692c>] (release_nodes) from [<c0403ea0>]
> (__device_release_driver+0x8c/0x110)
> [    2.243772] [<c0403ea0>] (__device_release_driver) from
> [<c0403f40>] (device_release_driver+0x1c/0x28)
> [    2.253060] [<c0403f40>] (device_release_driver) from [<c0403000>]
> (bus_remove_device+0xd8/0x104)
> [    2.261912] [<c0403000>] (bus_remove_device) from [<c04001b4>]
> (device_del+0x10c/0x218)
> [    2.269896] [<c04001b4>] (device_del) from [<c0405328>]
> (platform_device_del+0x1c/0x88)
> [    2.277881] [<c0405328>] (platform_device_del) from [<c04053a0>]
> (platform_device_unregister+0xc/0x20)
> [    2.287173] [<c04053a0>] (platform_device_unregister) from
> [<c0428a20>] (mfd_remove_devices_fn+0x5c/0x64)
> [    2.296720] [<c0428a20>] (mfd_remove_devices_fn) from [<c03ffeb4>]
> (device_for_each_child_reverse+0x4c/0x78)
> [    2.306528] [<c03ffeb4>] (device_for_each_child_reverse) from
> [<c0428724>] (mfd_remove_devices+0x20/0x30)
> [    2.316076] [<c0428724>] (mfd_remove_devices) from [<c04273ec>]
> (wm8994_device_init+0x2ac/0x7f0)
> [    2.324845] [<c04273ec>] (wm8994_device_init) from [<c04f127c>]
> (i2c_device_probe+0x178/0x1fc)
> [    2.333436] [<c04f127c>] (i2c_device_probe) from [<c0403bd8>]
> (driver_probe_device+0x214/0x2c0)
> [    2.342116] [<c0403bd8>] (driver_probe_device) from [<c0403d30>]
> (__driver_attach+0xac/0xb0)
> [    2.350535] [<c0403d30>] (__driver_attach) from [<c0401f50>]
> (bus_for_each_dev+0x68/0x9c)
> [    2.358693] [<c0401f50>] (bus_for_each_dev) from [<c04031cc>]
> (bus_add_driver+0x1a0/0x218)
> [    2.366940] [<c04031cc>] (bus_add_driver) from [<c0404548>]
> (driver_register+0x78/0xf8)
> [    2.374928] [<c0404548>] (driver_register) from [<c04f1e74>]
> (i2c_register_driver+0x34/0x84)
> [    2.383345] [<c04f1e74>] (i2c_register_driver) from [<c01017d0>]
> (do_one_initcall+0x40/0x170)
> [    2.391854] [<c01017d0>] (do_one_initcall) from [<c0a00dbc>]
> (kernel_init_freeable+0x15c/0x1fc)
> [    2.400533] [<c0a00dbc>] (kernel_init_freeable) from [<c06de010>]
> (kernel_init+0x8/0x114)
> [    2.408691] [<c06de010>] (kernel_init) from [<c0107978>]
> (ret_from_fork+0x14/0x3c)
> [    2.416285] ---[ end trace cdae3f0945a6102d ]---
> [    2.421160] ------------[ cut here ]------------
> [    2.425469] WARNING: CPU: 1 PID: 1 at
> /mnt/ssd/all/work/repos/devel/linux/drivers/regulator/core.c:4072
> regulator_unregister+0xc8/0xd0
> [    2.437541] Modules linked in:
> [    2.440529] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W
> 4.8.0-rc4-00085-g32f3101535ae-dirty #20
> [    2.450262] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [    2.456338] [<c010e2d0>] (unwind_backtrace) from [<c010af30>]
> (show_stack+0x10/0x14)
> [    2.464069] [<c010af30>] (show_stack) from [<c0329ce4>]
> (dump_stack+0x88/0x9c)
> [    2.471271] [<c0329ce4>] (dump_stack) from [<c011a958>] (__warn+0xe8/0x100)
> [    2.478206] [<c011a958>] (__warn) from [<c011aa20>]
> (warn_slowpath_null+0x20/0x28)
> [    2.485767] [<c011aa20>] (warn_slowpath_null) from [<c0384534>]
> (regulator_unregister+0xc8/0xd0)
> [    2.494535] [<c0384534>] (regulator_unregister) from [<c040692c>]
> (release_nodes+0x16c/0x1dc)
> [    2.503044] [<c040692c>] (release_nodes) from [<c0403ea0>]
> (__device_release_driver+0x8c/0x110)
> [    2.511724] [<c0403ea0>] (__device_release_driver) from
> [<c0403f40>] (device_release_driver+0x1c/0x28)
> [    2.521011] [<c0403f40>] (device_release_driver) from [<c0403000>]
> (bus_remove_device+0xd8/0x104)
> [    2.529863] [<c0403000>] (bus_remove_device) from [<c04001b4>]
> (device_del+0x10c/0x218)
> [    2.537847] [<c04001b4>] (device_del) from [<c0405328>]
> (platform_device_del+0x1c/0x88)
> [    2.545832] [<c0405328>] (platform_device_del) from [<c04053a0>]
> (platform_device_unregister+0xc/0x20)
> [    2.555122] [<c04053a0>] (platform_device_unregister) from
> [<c0428a20>] (mfd_remove_devices_fn+0x5c/0x64)
> [    2.564671] [<c0428a20>] (mfd_remove_devices_fn) from [<c03ffeb4>]
> (device_for_each_child_reverse+0x4c/0x78)
> [    2.574479] [<c03ffeb4>] (device_for_each_child_reverse) from
> [<c0428724>] (mfd_remove_devices+0x20/0x30)
> [    2.584027] [<c0428724>] (mfd_remove_devices) from [<c04273ec>]
> (wm8994_device_init+0x2ac/0x7f0)
> [    2.592794] [<c04273ec>] (wm8994_device_init) from [<c04f127c>]
> (i2c_device_probe+0x178/0x1fc)
> [    2.601387] [<c04f127c>] (i2c_device_probe) from [<c0403bd8>]
> (driver_probe_device+0x214/0x2c0)
> [    2.610067] [<c0403bd8>] (driver_probe_device) from [<c0403d30>]
> (__driver_attach+0xac/0xb0)
> [    2.618486] [<c0403d30>] (__driver_attach) from [<c0401f50>]
> (bus_for_each_dev+0x68/0x9c)
> [    2.626645] [<c0401f50>] (bus_for_each_dev) from [<c04031cc>]
> (bus_add_driver+0x1a0/0x218)
> [    2.634892] [<c04031cc>] (bus_add_driver) from [<c0404548>]
> (driver_register+0x78/0xf8)
> [    2.642877] [<c0404548>] (driver_register) from [<c04f1e74>]
> (i2c_register_driver+0x34/0x84)
> [    2.651296] [<c04f1e74>] (i2c_register_driver) from [<c01017d0>]
> (do_one_initcall+0x40/0x170)
> [    2.659803] [<c01017d0>] (do_one_initcall) from [<c0a00dbc>]
> (kernel_init_freeable+0x15c/0x1fc)
> [    2.668484] [<c0a00dbc>] (kernel_init_freeable) from [<c06de010>]
> (kernel_init+0x8/0x114)
> [    2.676641] [<c06de010>] (kernel_init) from [<c0107978>]
> (ret_from_fork+0x14/0x3c)
> [    2.684276] ---[ end trace cdae3f0945a6102e ]---
> [    2.689173] Unable to handle kernel NULL pointer dereference at
> virtual address 00000078
> [    2.696897] pgd = c0004000
> [    2.699539] [00000078] *pgd=00000000
> [    2.703100] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
> [    2.708395] Modules linked in:
> [    2.711431] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W
> 4.8.0-rc4-00085-g32f3101535ae-dirty #20
> [    2.721165] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [    2.727232] task: ee874000 task.stack: ee878000
> [    2.731749] PC is at down_write+0x14/0x54
> [    2.735741] LR is at debugfs_remove_recursive+0x30/0x150
> [    2.741034] pc : [<c06e20fc>]    lr : [<c02e9468>]    psr: 80000013
> [    2.741034] sp : ee879e18  ip : 2e583000  fp : 00000000
> [    2.752502] r10: 00000000  r9 : c04064fc  r8 : ee444be0
> [    2.757698] r7 : ee444c64  r6 : ee444c30  r5 : ee444be0  r4 : 00000078
> [    2.764208] r3 : ffff0001  r2 : 00000000  r1 : 00000001  r0 : 00000078
> [    2.770720] Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> [    2.777837] Control: 10c5387d  Table: 4000406a  DAC: 00000051
> [    2.783564] Process swapper/0 (pid: 1, stack limit = 0xee878210)
> [    2.789554] Stack: (0xee879e18 to 0xee87a000)
> [    2.793894] 9e00:
>     ee15d280 c02e9468
> [    2.802066] 9e20: ee15d280 ee152400 0000000d eea22820 ee879e58
> c03826a0 c0b1505c ee15d280
> [    2.810224] 9e40: 0000000d c0382744 ee15d240 ee15d140 0000000d
> c040692c ee1e7200 ee15d640
> [    2.818383] 9e60: eea22820 c0b81c4c c0b81c54 c0b22320 ffffffea
> 00000000 00000000 c0403ab0
> [    2.826543] 9e80: eea22820 c0b22320 eea22854 c0b2a950 c0b44000
> 000000d8 00000000 c0403d30
> [    2.834702] 9ea0: 00000000 c0b22320 c0403c84 c0401f50 ee97be74
> eea174c0 c0b22320 ee16ec00
> [    2.842861] 9ec0: 00000000 c04031cc c08a4c5c c0a1d418 c0a34840
> c0b22320 c0a1d418 c0a34840
> [    2.851020] 9ee0: c0b44000 c0404548 c0b22304 c0a1d418 c0a34840
> c04f1e74 c0a5fe60 c0a1d418
> [    2.859179] 9f00: c0a34840 c01017d0 c0b0ac18 ee879f18 c0b45fe8
> c06e17a0 60000000 c0b0958c
> [    2.867338] 9f20: 00000000 c0b0958c efffca46 c0716b40 efffca42
> c0135074 0000cccd 00000000
> [    2.875498] 9f40: c08cd618 00000000 00000006 00000006 c0b09568
> efffc940 c0a5fe60 00000006
> [    2.883657] 9f60: c0a34840 c0b44000 c0b44000 000000d8 c0a34848
> c0a00dbc 00000006 00000006
> [    2.891816] 9f80: 00000000 c0a005a0 00000000 c06de008 00000000
> 00000000 00000000 00000000
> [    2.899975] 9fa0: 00000000 c06de010 00000000 c0107978 00000000
> 00000000 00000000 00000000
> [    2.908134] 9fc0: 00000000 00000000 00000000 00000000 00000000
> 00000000 00000000 00000000
> [    2.916293] 9fe0: 00000000 00000000 00000000 00000000 00000013
> 00000000 ffffffff ffffffff
> [    2.924457] [<c06e20fc>] (down_write) from [<c02e9468>]
> (debugfs_remove_recursive+0x30/0x150)
> [    2.932964] [<c02e9468>] (debugfs_remove_recursive) from
> [<c03826a0>] (_regulator_put+0x24/0xac)
> [    2.941728] [<c03826a0>] (_regulator_put) from [<c0382744>]
> (regulator_put+0x1c/0x2c)
> [    2.949540] [<c0382744>] (regulator_put) from [<c040692c>]
> (release_nodes+0x16c/0x1dc)
> [    2.957440] [<c040692c>] (release_nodes) from [<c0403ab0>]
> (driver_probe_device+0xec/0x2c0)
> [    2.965773] [<c0403ab0>] (driver_probe_device) from [<c0403d30>]
> (__driver_attach+0xac/0xb0)
> [    2.974192] [<c0403d30>] (__driver_attach) from [<c0401f50>]
> (bus_for_each_dev+0x68/0x9c)
> [    2.982351] [<c0401f50>] (bus_for_each_dev) from [<c04031cc>]
> (bus_add_driver+0x1a0/0x218)
> [    2.990597] [<c04031cc>] (bus_add_driver) from [<c0404548>]
> (driver_register+0x78/0xf8)
> [    2.998583] [<c0404548>] (driver_register) from [<c04f1e74>]
> (i2c_register_driver+0x34/0x84)
> [    3.007003] [<c04f1e74>] (i2c_register_driver) from [<c01017d0>]
> (do_one_initcall+0x40/0x170)
> [    3.015509] [<c01017d0>] (do_one_initcall) from [<c0a00dbc>]
> (kernel_init_freeable+0x15c/0x1fc)
> [    3.024189] [<c0a00dbc>] (kernel_init_freeable) from [<c06de010>]
> (kernel_init+0x8/0x114)
> [    3.032349] [<c06de010>] (kernel_init) from [<c0107978>]
> (ret_from_fork+0x14/0x3c)
> [    3.039898] Code: e1a04000 f590f000 e3a03001 e34f3fff (e1902f9f)
> [    3.046011] ---[ end trace cdae3f0945a6102f ]---
> [    3.050611] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x0000000b
> [    3.050611]

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