Date:   Fri, 9 Sep 2016 14:19:35 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Mark Brown <broonie@...nel.org>, Lee Jones <lee.jones@...aro.org>,
        Krzysztof Kozłowski <k.kozlowski@...sung.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] mfd: wm8994: kenel WARN and crashes

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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