Regression in inv_mpu6050: 4.6.0-rc5

Regression in inv_mpu6050: 4.6.0-rc5

[One Thousand Gnomes]

This now causes us to crash and burn on the ASUS T100TA Baytrail/T
platforms

[    9.308605] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[    9.310735] IP: [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
[    9.312876] PGD 0 
[    9.314956] Oops: 0000 [#1] SMP 
[    9.317018] Modules linked in: inv_mpu6050_i2c(+) aes_x86_64 lrw gf128mul inv_mpu6050 glue_helper ablk_helper cryptd industrialio_triggered_buffer kfifo_buf industrialio snd_intel_sst_acpi snd_intel_sst_core i2c_mux snd_soc_rt5640 snd_soc_sst_mfld_platform snd_soc_rl6231 snd_soc_sst_match input_leds snd_soc_core hci_uart snd_compress snd_pcm_dmaengine lpc_ich snd_pcm btbcm snd_seq_midi btintel snd_seq_midi_event bluetooth snd_rawmidi wmi snd_seq snd_seq_device dw_dmac snd_timer dw_dmac_core soc_button_array snd soundcore processor_thermal_device int3402_thermal ac97_bus int3403_thermal int3400_thermal i2c_designware_platform intel_soc_dts_iosf int340x_thermal_zone acpi_thermal_rel acpi_pad i2c_designware_core pwm_lpss_platform pwm_lpss ipv6 autofs4 i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect
[    9.326919]  sysimgblt fb_sys_fops drm mmc_block hid_generic usbhid i2c_hid video hid sdhci_acpi sdhci
[    9.332174] CPU: 3 PID: 326 Comm: systemd-udevd Not tainted 4.6.0-rc5+ #3
[    9.334899] Hardware name: ASUSTeK COMPUTER INC. T100TA/T100TA, BIOS T100TA.307 05/09/2014
[    9.337655] task: ffff8800706dde80 ti: ffff880035928000 task.ti: ffff880035928000
[    9.340428] RIP: 0010:[<ffffffffc046622e>]  [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
[    9.343286] RSP: 0018:ffff88003592bad8  EFLAGS: 00010287
[    9.346132] RAX: ffff88003523e000 RBX: ffff880070d57000 RCX: ffff880070e51a40
[    9.349006] RDX: ffff880070e51a20 RSI: 00000000000000cf RDI: ffff88003523e000
[    9.351863] RBP: ffff88003592bb08 R08: ffff88007558c9f8 R09: ffff880070e51a40
[    9.354713] R10: ffff880070e51a38 R11: 0000000000000000 R12: 0000000000000000
[    9.357569] R13: ffff880070d57000 R14: ffffffffc04661d0 R15: ffff880070d57004
[    9.360431] FS:  00007f56017618c0(0000) GS:ffff880078980000(0000) knlGS:0000000000000000
[    9.363330] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    9.366226] CR2: 0000000000000018 CR3: 00000000359f6000 CR4: 00000000001006e0
[    9.369140] Stack:
[    9.371988]  ffffffff81303a32 00000000000000cf ffff880070d57020 ffffffffc04670c0
[    9.374883]  ffff880070d57020 ffff880070d57000 ffff88003592bb40 ffffffff8141ea6b
[    9.377769]  ffff880070d57020 0000000000000000 ffffffffc0468038 0000000000000029
[    9.380650] Call Trace:
[    9.383493]  [<ffffffff81303a32>] ? acpi_dev_pm_attach+0x85/0xa2
[    9.386382]  [<ffffffff8141ea6b>] i2c_device_probe+0xfb/0x1b0
[    9.389260]  [<ffffffff8138be67>] driver_probe_device+0x227/0x440
[    9.392130]  [<ffffffff8138c14c>] __driver_attach+0xcc/0xf0
[    9.395000]  [<ffffffff8138c080>] ? driver_probe_device+0x440/0x440
[    9.397875]  [<ffffffff81389a07>] bus_for_each_dev+0x67/0xb0
[    9.400759]  [<ffffffff8138b599>] driver_attach+0x19/0x20
[    9.403636]  [<ffffffff8138b031>] bus_add_driver+0x1e1/0x280
[    9.406539]  [<ffffffffc0076000>] ? 0xffffffffc0076000
[    9.409424]  [<ffffffff8138c8bb>] driver_register+0x5b/0xd0
[    9.412278]  [<ffffffff8141f666>] i2c_register_driver+0x26/0x90
[    9.415171]  [<ffffffffc0076017>] inv_mpu_driver_init+0x17/0x19 [inv_mpu6050_i2c]
[    9.418058]  [<ffffffff810003de>] do_one_initcall+0xae/0x1f0
[    9.420972]  [<ffffffff8113f07b>] ? kmem_cache_alloc+0x2b/0xc0
[    9.423856]  [<ffffffff810fbfa3>] do_init_module+0x55/0x1c5
[    9.426770]  [<ffffffff810c0733>] load_module+0x2123/0x2730
[    9.429664]  [<ffffffff810bd8f0>] ? __symbol_put+0x50/0x50
[    9.432537]  [<ffffffff810c0fb6>] SYSC_finit_module+0xe6/0x120
[    9.435382]  [<ffffffff810c1009>] SyS_finit_module+0x9/0x10
[    9.438212]  [<ffffffff8152819f>] entry_SYSCALL_64_fastpath+0x17/0x93
[    9.441015] Code: 00 00 00 31 c9 31 d2 48 89 df 48 c7 c6 e0 70 46 c0 e8 37 e7 f3 c0 48 3d 00 f0 ff ff 48 89 c7 0f 87 94 00 00 00 8b b3 d0 02 00 00 <45> 8b 44 24 18 31 c9 4c 89 e2 e8 b3 b9 06 00 85 c0 78 4f 48 8b 
[    9.446976] RIP  [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
[    9.449967]  RSP <ffff88003592bad8>
[    9.452844] CR2: 0000000000000018
[    9.455673] ---[ end trace d9e48d40f1079c34 ]---

Alan

Re: Regression in inv_mpu6050: 4.6.0-rc5

[Michael Welling]

On Tue, Apr 26, 2016 at 11:26:51PM +0100, One Thousand Gnomes wrote:
> 
> This now causes us to crash and burn on the ASUS T100TA Baytrail/T
> platforms
>

I believe this regression has already been patched.

Check the latest commits in linux-next.

https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c

See if the latest patches fix your issue.

> [    9.308605] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
> [    9.310735] IP: [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
> [    9.312876] PGD 0 
> [    9.314956] Oops: 0000 [#1] SMP 
> [    9.317018] Modules linked in: inv_mpu6050_i2c(+) aes_x86_64 lrw gf128mul inv_mpu6050 glue_helper ablk_helper cryptd industrialio_triggered_buffer kfifo_buf industrialio snd_intel_sst_acpi snd_intel_sst_core i2c_mux snd_soc_rt5640 snd_soc_sst_mfld_platform snd_soc_rl6231 snd_soc_sst_match input_leds snd_soc_core hci_uart snd_compress snd_pcm_dmaengine lpc_ich snd_pcm btbcm snd_seq_midi btintel snd_seq_midi_event bluetooth snd_rawmidi wmi snd_seq snd_seq_device dw_dmac snd_timer dw_dmac_core soc_button_array snd soundcore processor_thermal_device int3402_thermal ac97_bus int3403_thermal int3400_thermal i2c_designware_platform intel_soc_dts_iosf int340x_thermal_zone acpi_thermal_rel acpi_pad i2c_designware_core pwm_lpss_platform pwm_lpss ipv6 autofs4 i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect
> [    9.326919]  sysimgblt fb_sys_fops drm mmc_block hid_generic usbhid i2c_hid video hid sdhci_acpi sdhci
> [    9.332174] CPU: 3 PID: 326 Comm: systemd-udevd Not tainted 4.6.0-rc5+ #3
> [    9.334899] Hardware name: ASUSTeK COMPUTER INC. T100TA/T100TA, BIOS T100TA.307 05/09/2014
> [    9.337655] task: ffff8800706dde80 ti: ffff880035928000 task.ti: ffff880035928000
> [    9.340428] RIP: 0010:[<ffffffffc046622e>]  [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
> [    9.343286] RSP: 0018:ffff88003592bad8  EFLAGS: 00010287
> [    9.346132] RAX: ffff88003523e000 RBX: ffff880070d57000 RCX: ffff880070e51a40
> [    9.349006] RDX: ffff880070e51a20 RSI: 00000000000000cf RDI: ffff88003523e000
> [    9.351863] RBP: ffff88003592bb08 R08: ffff88007558c9f8 R09: ffff880070e51a40
> [    9.354713] R10: ffff880070e51a38 R11: 0000000000000000 R12: 0000000000000000
> [    9.357569] R13: ffff880070d57000 R14: ffffffffc04661d0 R15: ffff880070d57004
> [    9.360431] FS:  00007f56017618c0(0000) GS:ffff880078980000(0000) knlGS:0000000000000000
> [    9.363330] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    9.366226] CR2: 0000000000000018 CR3: 00000000359f6000 CR4: 00000000001006e0
> [    9.369140] Stack:
> [    9.371988]  ffffffff81303a32 00000000000000cf ffff880070d57020 ffffffffc04670c0
> [    9.374883]  ffff880070d57020 ffff880070d57000 ffff88003592bb40 ffffffff8141ea6b
> [    9.377769]  ffff880070d57020 0000000000000000 ffffffffc0468038 0000000000000029
> [    9.380650] Call Trace:
> [    9.383493]  [<ffffffff81303a32>] ? acpi_dev_pm_attach+0x85/0xa2
> [    9.386382]  [<ffffffff8141ea6b>] i2c_device_probe+0xfb/0x1b0
> [    9.389260]  [<ffffffff8138be67>] driver_probe_device+0x227/0x440
> [    9.392130]  [<ffffffff8138c14c>] __driver_attach+0xcc/0xf0
> [    9.395000]  [<ffffffff8138c080>] ? driver_probe_device+0x440/0x440
> [    9.397875]  [<ffffffff81389a07>] bus_for_each_dev+0x67/0xb0
> [    9.400759]  [<ffffffff8138b599>] driver_attach+0x19/0x20
> [    9.403636]  [<ffffffff8138b031>] bus_add_driver+0x1e1/0x280
> [    9.406539]  [<ffffffffc0076000>] ? 0xffffffffc0076000
> [    9.409424]  [<ffffffff8138c8bb>] driver_register+0x5b/0xd0
> [    9.412278]  [<ffffffff8141f666>] i2c_register_driver+0x26/0x90
> [    9.415171]  [<ffffffffc0076017>] inv_mpu_driver_init+0x17/0x19 [inv_mpu6050_i2c]
> [    9.418058]  [<ffffffff810003de>] do_one_initcall+0xae/0x1f0
> [    9.420972]  [<ffffffff8113f07b>] ? kmem_cache_alloc+0x2b/0xc0
> [    9.423856]  [<ffffffff810fbfa3>] do_init_module+0x55/0x1c5
> [    9.426770]  [<ffffffff810c0733>] load_module+0x2123/0x2730
> [    9.429664]  [<ffffffff810bd8f0>] ? __symbol_put+0x50/0x50
> [    9.432537]  [<ffffffff810c0fb6>] SYSC_finit_module+0xe6/0x120
> [    9.435382]  [<ffffffff810c1009>] SyS_finit_module+0x9/0x10
> [    9.438212]  [<ffffffff8152819f>] entry_SYSCALL_64_fastpath+0x17/0x93
> [    9.441015] Code: 00 00 00 31 c9 31 d2 48 89 df 48 c7 c6 e0 70 46 c0 e8 37 e7 f3 c0 48 3d 00 f0 ff ff 48 89 c7 0f 87 94 00 00 00 8b b3 d0 02 00 00 <45> 8b 44 24 18 31 c9 4c 89 e2 e8 b3 b9 06 00 85 c0 78 4f 48 8b 
> [    9.446976] RIP  [<ffffffffc046622e>] inv_mpu_probe+0x5e/0x110 [inv_mpu6050_i2c]
> [    9.449967]  RSP <ffff88003592bad8>
> [    9.452844] CR2: 0000000000000018
> [    9.455673] ---[ end trace d9e48d40f1079c34 ]---
> 
> Alan
> --
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Re: Regression in inv_mpu6050: 4.6.0-rc5

[One Thousand Gnomes]

On Tue, 26 Apr 2016 18:07:55 -0500
Michael Welling <mwelling@ieee.org> wrote:

> On Tue, Apr 26, 2016 at 11:26:51PM +0100, One Thousand Gnomes wrote:
> > 
> > This now causes us to crash and burn on the ASUS T100TA Baytrail/T
> > platforms
> >  
> 
> I believe this regression has already been patched.
> 
> Check the latest commits in linux-next.
> 
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
> 
> See if the latest patches fix your issue.

It does - as this is a regression can we please get those fixes into the
next -rc ?

Alan

Re: Regression in inv_mpu6050: 4.6.0-rc5

[Jonathan Cameron]

On 27/04/16 16:56, One Thousand Gnomes wrote:
> On Tue, 26 Apr 2016 18:07:55 -0500
> Michael Welling <mwelling@ieee.org> wrote:
> 
>> On Tue, Apr 26, 2016 at 11:26:51PM +0100, One Thousand Gnomes wrote:
>>>
>>> This now causes us to crash and burn on the ASUS T100TA Baytrail/T
>>> platforms
>>>  
>>
>> I believe this regression has already been patched.
>>
>> Check the latest commits in linux-next.
>>
>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
>>
>> See if the latest patches fix your issue.
> 
> It does - as this is a regression can we please get those fixes into the
> next -rc ?
> 
I'm afraid I'm lost in this one - which patch caused the regression and
which one fixed it?  The only patches I can immediately see in next
both introduce and then squish a similar bug, but neither of them
has hit Linus' tree yet.

Or are we dealing with what was fixed in:
c816d9e7 iio: imu: mpu6050: fix possible NULL dereferences
I had understood that one as more hypothetical than real...

Unfortunately I'm travelling and I suspect that means this will only get
in just after the release (so for 4.6.1) once I've confirmed which fixes
we actually need to backport.

Jonathan

Re: Regression in inv_mpu6050: 4.6.0-rc5

[Crestez Dan Leonard]

On 05/01/2016 10:58 PM, Jonathan Cameron wrote:
> On 27/04/16 16:56, One Thousand Gnomes wrote:
>> On Tue, 26 Apr 2016 18:07:55 -0500
>> Michael Welling <mwelling@ieee.org> wrote:
>>
>>> On Tue, Apr 26, 2016 at 11:26:51PM +0100, One Thousand Gnomes wrote:
>>>>
>>>> This now causes us to crash and burn on the ASUS T100TA Baytrail/T
>>>> platforms
>>>>  
>>>
>>> I believe this regression has already been patched.
>>>
>>> Check the latest commits in linux-next.
>>>
>>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
>>>
>>> See if the latest patches fix your issue.
>>
>> It does - as this is a regression can we please get those fixes into the
>> next -rc ?
>>
> I'm afraid I'm lost in this one - which patch caused the regression and
> which one fixed it?  The only patches I can immediately see in next
> both introduce and then squish a similar bug, but neither of them
> has hit Linus' tree yet.
> 
> Or are we dealing with what was fixed in:
> c816d9e7 iio: imu: mpu6050: fix possible NULL dereferences
> I had understood that one as more hypothetical than real...
> 
> Unfortunately I'm travelling and I suspect that means this will only get
> in just after the release (so for 4.6.1) once I've confirmed which fixes
> we actually need to backport.
> 
Commit
    c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
Fixes:
    33da559f: iio: imu: mpu6050: add mpu6500 register settings

As far as I can tell this crash will always happen when the device is
probed via ACPI.

-- 
Regards,
Leonard

Re: Regression in inv_mpu6050: 4.6.0-rc5

[Jonathan Cameron]

On 03/05/16 19:54, Crestez Dan Leonard wrote:
> On 05/01/2016 10:58 PM, Jonathan Cameron wrote:
>> On 27/04/16 16:56, One Thousand Gnomes wrote:
>>> On Tue, 26 Apr 2016 18:07:55 -0500
>>> Michael Welling <mwelling@ieee.org> wrote:
>>>
>>>> On Tue, Apr 26, 2016 at 11:26:51PM +0100, One Thousand Gnomes wrote:
>>>>>
>>>>> This now causes us to crash and burn on the ASUS T100TA Baytrail/T
>>>>> platforms
>>>>>  
>>>>
>>>> I believe this regression has already been patched.
>>>>
>>>> Check the latest commits in linux-next.
>>>>
>>>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
>>>>
>>>> See if the latest patches fix your issue.
>>>
>>> It does - as this is a regression can we please get those fixes into the
>>> next -rc ?
>>>
>> I'm afraid I'm lost in this one - which patch caused the regression and
>> which one fixed it?  The only patches I can immediately see in next
>> both introduce and then squish a similar bug, but neither of them
>> has hit Linus' tree yet.
>>
>> Or are we dealing with what was fixed in:
>> c816d9e7 iio: imu: mpu6050: fix possible NULL dereferences
>> I had understood that one as more hypothetical than real...
>>
>> Unfortunately I'm travelling and I suspect that means this will only get
>> in just after the release (so for 4.6.1) once I've confirmed which fixes
>> we actually need to backport.
>>
> Commit
>     c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
> Fixes:
>     33da559f: iio: imu: mpu6050: add mpu6500 register settings
> 
> As far as I can tell this crash will always happen when the device is
> probed via ACPI.

Hi Greg,

A quick heads up.

Unfortunately this regression has come up whilst I'm travelling and
don't have appropriate signing keys with me to do a pull request.
Should be able to do one tomorrow evening as I'll back home.

Turns out the 'possible' is quite common and causing a mess.
Even better the fix actually has a fix as well... 

Fastest option is probably a cherry pick of:

c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
718ba46e: iio: imu: mpu6050: Fix name/chip_id when using ACPI

I'll send you a pull request of my 
togreg-in-a-hurry branch tomorrow.

Sorry for these being so late in the cycle.

Anyhow, run for train time. 

Thanks

Jonathan

Re: Regression in inv_mpu6050: 4.6.0-rc5

[Greg KH]

On Wed, May 04, 2016 at 08:49:06AM +0100, Jonathan Cameron wrote:
> On 03/05/16 19:54, Crestez Dan Leonard wrote:
> > On 05/01/2016 10:58 PM, Jonathan Cameron wrote:
> >> On 27/04/16 16:56, One Thousand Gnomes wrote:
> >>> On Tue, 26 Apr 2016 18:07:55 -0500
> >>> Michael Welling <mwelling@ieee.org> wrote:
> >>>
> >>>> On Tue, Apr 26, 2016 at 11:26:51PM +0100, One Thousand Gnomes wrote:
> >>>>>
> >>>>> This now causes us to crash and burn on the ASUS T100TA Baytrail/T
> >>>>> platforms
> >>>>>  
> >>>>
> >>>> I believe this regression has already been patched.
> >>>>
> >>>> Check the latest commits in linux-next.
> >>>>
> >>>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
> >>>>
> >>>> See if the latest patches fix your issue.
> >>>
> >>> It does - as this is a regression can we please get those fixes into the
> >>> next -rc ?
> >>>
> >> I'm afraid I'm lost in this one - which patch caused the regression and
> >> which one fixed it?  The only patches I can immediately see in next
> >> both introduce and then squish a similar bug, but neither of them
> >> has hit Linus' tree yet.
> >>
> >> Or are we dealing with what was fixed in:
> >> c816d9e7 iio: imu: mpu6050: fix possible NULL dereferences
> >> I had understood that one as more hypothetical than real...
> >>
> >> Unfortunately I'm travelling and I suspect that means this will only get
> >> in just after the release (so for 4.6.1) once I've confirmed which fixes
> >> we actually need to backport.
> >>
> > Commit
> >     c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
> > Fixes:
> >     33da559f: iio: imu: mpu6050: add mpu6500 register settings
> > 
> > As far as I can tell this crash will always happen when the device is
> > probed via ACPI.
> 
> Hi Greg,
> 
> A quick heads up.
> 
> Unfortunately this regression has come up whilst I'm travelling and
> don't have appropriate signing keys with me to do a pull request.
> Should be able to do one tomorrow evening as I'll back home.
> 
> Turns out the 'possible' is quite common and causing a mess.
> Even better the fix actually has a fix as well... 
> 
> Fastest option is probably a cherry pick of:
> 
> c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
> 718ba46e: iio: imu: mpu6050: Fix name/chip_id when using ACPI

>From where?

> 
> I'll send you a pull request of my 
> togreg-in-a-hurry branch tomorrow.
> 
> Sorry for these being so late in the cycle.
> 
> Anyhow, run for train time. 

You can always just send me patches, no need for it to always be a pull
request if you can't do that for some reason.

thanks,

greg k-h

Re: Regression in inv_mpu6050: 4.6.0-rc5

[Jonathan Cameron]

On 4 May 2016 18:24:43 BST, Greg KH <gregkh@linuxfoundation.org> wrote:
>On Wed, May 04, 2016 at 08:49:06AM +0100, Jonathan Cameron wrote:
>> On 03/05/16 19:54, Crestez Dan Leonard wrote:
>> > On 05/01/2016 10:58 PM, Jonathan Cameron wrote:
>> >> On 27/04/16 16:56, One Thousand Gnomes wrote:
>> >>> On Tue, 26 Apr 2016 18:07:55 -0500
>> >>> Michael Welling <mwelling@ieee.org> wrote:
>> >>>
>> >>>> On Tue, Apr 26, 2016 at 11:26:51PM +0100, One Thousand Gnomes
>wrote:
>> >>>>>
>> >>>>> This now causes us to crash and burn on the ASUS T100TA
>Baytrail/T
>> >>>>> platforms
>> >>>>>  
>> >>>>
>> >>>> I believe this regression has already been patched.
>> >>>>
>> >>>> Check the latest commits in linux-next.
>> >>>>
>> >>>>
>https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
>> >>>>
>> >>>> See if the latest patches fix your issue.
>> >>>
>> >>> It does - as this is a regression can we please get those fixes
>into the
>> >>> next -rc ?
>> >>>
>> >> I'm afraid I'm lost in this one - which patch caused the
>regression and
>> >> which one fixed it?  The only patches I can immediately see in
>next
>> >> both introduce and then squish a similar bug, but neither of them
>> >> has hit Linus' tree yet.
>> >>
>> >> Or are we dealing with what was fixed in:
>> >> c816d9e7 iio: imu: mpu6050: fix possible NULL dereferences
>> >> I had understood that one as more hypothetical than real...
>> >>
>> >> Unfortunately I'm travelling and I suspect that means this will
>only get
>> >> in just after the release (so for 4.6.1) once I've confirmed which
>fixes
>> >> we actually need to backport.
>> >>
>> > Commit
>> >     c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
>> > Fixes:
>> >     33da559f: iio: imu: mpu6050: add mpu6500 register settings
>> > 
>> > As far as I can tell this crash will always happen when the device
>is
>> > probed via ACPI.
>> 
>> Hi Greg,
>> 
>> A quick heads up.
>> 
>> Unfortunately this regression has come up whilst I'm travelling and
>> don't have appropriate signing keys with me to do a pull request.
>> Should be able to do one tomorrow evening as I'll back home.
>> 
>> Turns out the 'possible' is quite common and causing a mess.
>> Even better the fix actually has a fix as well... 
>> 
>> Fastest option is probably a cherry pick of:
>> 
>> c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
>> 718ba46e: iio: imu: mpu6050: Fix name/chip_id when using ACPI
>
>From where?
Doh.

Both already in your staging-next. Confusion was over the seriousness of the issue so went via wrong route.

>
>> 
>> I'll send you a pull request of my 
>> togreg-in-a-hurry branch tomorrow.
>> 
>> Sorry for these being so late in the cycle.
>> 
>> Anyhow, run for train time. 
>
>You can always just send me patches, no need for it to always be a pull
>request if you can't do that for some reason.

Good point, nothing like limited time to make one an idiot sometimes!

Jonathan
>
>thanks,
>
>greg k-h

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Re: Regression in inv_mpu6050: 4.6.0-rc5

[Jonathan Cameron]

On 4 May 2016 18:24:43 BST, Greg KH <gregkh@linuxfoundation.org> wrote:
>On Wed, May 04, 2016 at 08:49:06AM +0100, Jonathan Cameron wrote:
>> On 03/05/16 19:54, Crestez Dan Leonard wrote:
>> > On 05/01/2016 10:58 PM, Jonathan Cameron wrote:
>> >> On 27/04/16 16:56, One Thousand Gnomes wrote:
>> >>> On Tue, 26 Apr 2016 18:07:55 -0500
>> >>> Michael Welling <mwelling@ieee.org> wrote:
>> >>>
>> >>>> On Tue, Apr 26, 2016 at 11:26:51PM +0100, One Thousand Gnomes
>wrote:
>> >>>>>
>> >>>>> This now causes us to crash and burn on the ASUS T100TA
>Baytrail/T
>> >>>>> platforms
>> >>>>>  
>> >>>>
>> >>>> I believe this regression has already been patched.
>> >>>>
>> >>>> Check the latest commits in linux-next.
>> >>>>
>> >>>>
>https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
>> >>>>
>> >>>> See if the latest patches fix your issue.
>> >>>
>> >>> It does - as this is a regression can we please get those fixes
>into the
>> >>> next -rc ?
>> >>>
>> >> I'm afraid I'm lost in this one - which patch caused the
>regression and
>> >> which one fixed it?  The only patches I can immediately see in
>next
>> >> both introduce and then squish a similar bug, but neither of them
>> >> has hit Linus' tree yet.
>> >>
>> >> Or are we dealing with what was fixed in:
>> >> c816d9e7 iio: imu: mpu6050: fix possible NULL dereferences
>> >> I had understood that one as more hypothetical than real...
>> >>
>> >> Unfortunately I'm travelling and I suspect that means this will
>only get
>> >> in just after the release (so for 4.6.1) once I've confirmed which
>fixes
>> >> we actually need to backport.
>> >>
>> > Commit
>> >     c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
>> > Fixes:
>> >     33da559f: iio: imu: mpu6050: add mpu6500 register settings
>> > 
>> > As far as I can tell this crash will always happen when the device
>is
>> > probed via ACPI.
>> 
>> Hi Greg,
>> 
>> A quick heads up.
>> 
>> Unfortunately this regression has come up whilst I'm travelling and
>> don't have appropriate signing keys with me to do a pull request.
>> Should be able to do one tomorrow evening as I'll back home.
>> 
>> Turns out the 'possible' is quite common and causing a mess.
>> Even better the fix actually has a fix as well... 
>> 
>> Fastest option is probably a cherry pick of:
>> 
>> c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
>> 718ba46e: iio: imu: mpu6050: Fix name/chip_id when using ACPI
>
>>From where?
Doh.

Both already in your staging-next. Confusion was over the seriousness of the issue so went via wrong route.

>
>> 
>> I'll send you a pull request of my 
>> togreg-in-a-hurry branch tomorrow.
>> 
>> Sorry for these being so late in the cycle.
>> 
>> Anyhow, run for train time. 
>
>You can always just send me patches, no need for it to always be a pull
>request if you can't do that for some reason.

Good point, nothing like limited time to make one an idiot sometimes!

Jonathan
>
>thanks,
>
>greg k-h

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.

Re: Regression in inv_mpu6050: 4.6.0-rc5

[Jonathan Cameron]

On 04/05/16 19:15, Jonathan Cameron wrote:
> 
> 
> On 4 May 2016 18:24:43 BST, Greg KH <gregkh@linuxfoundation.org> wrote:
>> On Wed, May 04, 2016 at 08:49:06AM +0100, Jonathan Cameron wrote:
>>> On 03/05/16 19:54, Crestez Dan Leonard wrote:
>>>> On 05/01/2016 10:58 PM, Jonathan Cameron wrote:
>>>>> On 27/04/16 16:56, One Thousand Gnomes wrote:
>>>>>> On Tue, 26 Apr 2016 18:07:55 -0500
>>>>>> Michael Welling <mwelling@ieee.org> wrote:
>>>>>>
>>>>>>> On Tue, Apr 26, 2016 at 11:26:51PM +0100, One Thousand Gnomes
>> wrote:
>>>>>>>>
>>>>>>>> This now causes us to crash and burn on the ASUS T100TA
>> Baytrail/T
>>>>>>>> platforms
>>>>>>>>  
>>>>>>>
>>>>>>> I believe this regression has already been patched.
>>>>>>>
>>>>>>> Check the latest commits in linux-next.
>>>>>>>
>>>>>>>
>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
>>>>>>>
>>>>>>> See if the latest patches fix your issue.
>>>>>>
>>>>>> It does - as this is a regression can we please get those fixes
>> into the
>>>>>> next -rc ?
>>>>>>
>>>>> I'm afraid I'm lost in this one - which patch caused the
>> regression and
>>>>> which one fixed it?  The only patches I can immediately see in
>> next
>>>>> both introduce and then squish a similar bug, but neither of them
>>>>> has hit Linus' tree yet.
>>>>>
>>>>> Or are we dealing with what was fixed in:
>>>>> c816d9e7 iio: imu: mpu6050: fix possible NULL dereferences
>>>>> I had understood that one as more hypothetical than real...
>>>>>
>>>>> Unfortunately I'm travelling and I suspect that means this will
>> only get
>>>>> in just after the release (so for 4.6.1) once I've confirmed which
>> fixes
>>>>> we actually need to backport.
>>>>>
>>>> Commit
>>>>     c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
>>>> Fixes:
>>>>     33da559f: iio: imu: mpu6050: add mpu6500 register settings
>>>>
>>>> As far as I can tell this crash will always happen when the device
>> is
>>>> probed via ACPI.
>>>
>>> Hi Greg,
>>>
>>> A quick heads up.
>>>
>>> Unfortunately this regression has come up whilst I'm travelling and
>>> don't have appropriate signing keys with me to do a pull request.
>>> Should be able to do one tomorrow evening as I'll back home.
>>>
>>> Turns out the 'possible' is quite common and causing a mess.
>>> Even better the fix actually has a fix as well... 
>>>
>>> Fastest option is probably a cherry pick of:
>>>
>>> c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
>>> 718ba46e: iio: imu: mpu6050: Fix name/chip_id when using ACPI
>>
>>From where?
> Doh.
> 
> Both already in your staging-next. Confusion was over
> the seriousness of the issue so went via wrong route.
> 
>>
>>>
>>> I'll send you a pull request of my 
>>> togreg-in-a-hurry branch tomorrow.
>>>
>>> Sorry for these being so late in the cycle.
>>>
>>> Anyhow, run for train time. 
>>
>> You can always just send me patches, no need for it to always be a pull
>> request if you can't do that for some reason.
> 
> Good point, nothing like limited time to make one an idiot sometimes!
> 
> Jonathan
>>
>> thanks,
>>
>> greg k-h
> 
I've just sent a pull request in case if you want to grab it that way.

For reference the crash report is:
http://www.spinics.net/lists/linux-iio/msg24431.html

Thanks,

Jonathan

Re: Regression in inv_mpu6050: 4.6.0-rc5

[Jonathan Cameron]

On 04/05/16 19:15, Jonathan Cameron wrote:
> 
> 
> On 4 May 2016 18:24:43 BST, Greg KH <gregkh@linuxfoundation.org> wrote:
>> On Wed, May 04, 2016 at 08:49:06AM +0100, Jonathan Cameron wrote:
>>> On 03/05/16 19:54, Crestez Dan Leonard wrote:
>>>> On 05/01/2016 10:58 PM, Jonathan Cameron wrote:
>>>>> On 27/04/16 16:56, One Thousand Gnomes wrote:
>>>>>> On Tue, 26 Apr 2016 18:07:55 -0500
>>>>>> Michael Welling <mwelling@ieee.org> wrote:
>>>>>>
>>>>>>> On Tue, Apr 26, 2016 at 11:26:51PM +0100, One Thousand Gnomes
>> wrote:
>>>>>>>>
>>>>>>>> This now causes us to crash and burn on the ASUS T100TA
>> Baytrail/T
>>>>>>>> platforms
>>>>>>>>  
>>>>>>>
>>>>>>> I believe this regression has already been patched.
>>>>>>>
>>>>>>> Check the latest commits in linux-next.
>>>>>>>
>>>>>>>
>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
>>>>>>>
>>>>>>> See if the latest patches fix your issue.
>>>>>>
>>>>>> It does - as this is a regression can we please get those fixes
>> into the
>>>>>> next -rc ?
>>>>>>
>>>>> I'm afraid I'm lost in this one - which patch caused the
>> regression and
>>>>> which one fixed it?  The only patches I can immediately see in
>> next
>>>>> both introduce and then squish a similar bug, but neither of them
>>>>> has hit Linus' tree yet.
>>>>>
>>>>> Or are we dealing with what was fixed in:
>>>>> c816d9e7 iio: imu: mpu6050: fix possible NULL dereferences
>>>>> I had understood that one as more hypothetical than real...
>>>>>
>>>>> Unfortunately I'm travelling and I suspect that means this will
>> only get
>>>>> in just after the release (so for 4.6.1) once I've confirmed which
>> fixes
>>>>> we actually need to backport.
>>>>>
>>>> Commit
>>>>     c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
>>>> Fixes:
>>>>     33da559f: iio: imu: mpu6050: add mpu6500 register settings
>>>>
>>>> As far as I can tell this crash will always happen when the device
>> is
>>>> probed via ACPI.
>>>
>>> Hi Greg,
>>>
>>> A quick heads up.
>>>
>>> Unfortunately this regression has come up whilst I'm travelling and
>>> don't have appropriate signing keys with me to do a pull request.
>>> Should be able to do one tomorrow evening as I'll back home.
>>>
>>> Turns out the 'possible' is quite common and causing a mess.
>>> Even better the fix actually has a fix as well... 
>>>
>>> Fastest option is probably a cherry pick of:
>>>
>>> c816d9e7: iio: imu: mpu6050: fix possible NULL dereferences
>>> 718ba46e: iio: imu: mpu6050: Fix name/chip_id when using ACPI
>>
>>>From where?
> Doh.
> 
> Both already in your staging-next. Confusion was over
> the seriousness of the issue so went via wrong route.
> 
>>
>>>
>>> I'll send you a pull request of my 
>>> togreg-in-a-hurry branch tomorrow.
>>>
>>> Sorry for these being so late in the cycle.
>>>
>>> Anyhow, run for train time. 
>>
>> You can always just send me patches, no need for it to always be a pull
>> request if you can't do that for some reason.
> 
> Good point, nothing like limited time to make one an idiot sometimes!
> 
> Jonathan
>>
>> thanks,
>>
>> greg k-h
> 
I've just sent a pull request in case if you want to grab it that way.

For reference the crash report is:
http://www.spinics.net/lists/linux-iio/msg24431.html

Thanks,

Jonathan