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SubjectRe: Sometimes unusable i2c-hid devices in 4.17-rcX
Hi Mario,

On Wed, May 16, 2018 at 10:00 PM, <Mario.Limonciello@dell.com> wrote:
> Hi All,
>
> I've been running 4.16-rc7 on an XPS 9365 for some time and recently moved up to 4.17-rc5.
> Immediately I noticed that i2c-hid devices (both touchscreen and touchpad) were not working.
> Also when shutting the system down or rebooting it would just hang. (magic sysrq still worked).
>
> I figured it was an easy to identify regression so I started a bisect but it came up with garbage
> that ended in selftests shortly after 4.17-rc2. I realized that's because is still will fail on 4.17-rc2
> occasionally, seemingly after trying something newer and warm rebooting.
> So it seems like it's "worse" after 4.17-rc2 (doesn't work at all) but semi reproducible on 4.17-rc2.
>
> Not sure if I'm chasing some initialization race, but wanted to see if anyone else was running into this
> or has some ideas?

I am reliably running a v4.17-rc3 with a merge on Jiri's tree on the 9360.

I doubt it's related to the event processing as I am not encountering
those issues.

It *could* be related to the interrupts not being properly raised.

Could you monitor /proc/interrupts and check if the ones associated
with your i2c-hid devices are increasing when you are using them?
Also, does the device emits raw HID events? (you can use hid-recorder
to check on the hidraw nodes.)

Cheers,
Benjamin

>
> #dmesg | grep 'i2c\|hid' doesn't show any obvious errors when in this state of non functional hid stuff.
> [ 2.398649] i2c /dev entries driver
> [ 2.881651] hidraw: raw HID events driver (C) Jiri Kosina
> [ 3.683583] ish-hid {33AECD58-B679-4E54-9BD9-A04D34F0C226}: [hid-ish]: enum_devices_done OK, num_hid_devices=5
> [ 3.701259] hid-generic 001F:8086:22D8.0001: hidraw0: <UNKNOWN> HID v2.00 Device [hid-ishtp 8086:22D8] on
> [ 3.702204] hid-generic 001F:8086:22D8.0002: hidraw1: <UNKNOWN> HID v2.00 Device [hid-ishtp 8086:22D8] on
> [ 3.703063] hid-generic 001F:8086:22D8.0003: hidraw2: <UNKNOWN> HID v2.00 Device [hid-ishtp 8086:22D8] on
> [ 3.704276] hid-generic 001F:8086:22D8.0004: hidraw3: <UNKNOWN> HID v2.00 Device [hid-ishtp 8086:22D8] on
> [ 3.704557] hid-generic 001F:8086:22D8.0005: hidraw4: <UNKNOWN> HID v2.00 Device [hid-ishtp 8086:22D8] on
> [ 3.750710] psmouse serio1: synaptics: Your touchpad (PNP: DLL077a PNP0f13) says it can support a different bus. If i2c-hid and hid-rmi are not used, you might want to try setting psmouse.synaptics_intertouch to 1 and report this to linux-input@vger.kernel.org.
> [ 7.030446] acpi INT33D5:00: intel-hid: created platform device
> [ 7.199178] i2c_hid i2c-WCOM482F:00: i2c-WCOM482F:00 supply vdd not found, using dummy regulator
> [ 7.246638] input: WCOM482F:00 056A:482F as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-6/i2c-WCOM482F:00/0018:056A:482F.0006/input/input11
> [ 7.246873] hid-generic 0018:056A:482F.0006: input,hidraw0: I2C HID v1.00 Mouse [WCOM482F:00 056A:482F] on i2c-WCOM482F:00
> [ 7.275279] i2c_hid i2c-DLL077A:01: i2c-DLL077A:01 supply vdd not found, using dummy regulator
> [ 7.304107] input: DLL077A:01 06CB:76AF as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-7/i2c-DLL077A:01/0018:06CB:76AF.0007/input/input14
> [ 7.304212] hid-generic 0018:06CB:76AF.0007: input,hidraw1: I2C HID v1.00 Mouse [DLL077A:01 06CB:76AF] on i2c-DLL077A:01
> [ 7.657123] usbcore: registered new interface driver usbhid
> [ 7.657124] usbhid: USB HID core driver
> [ 7.722876] input: Wacom HID 482F Pen as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-6/i2c-WCOM482F:00/0018:056A:482F.0006/input/input15
> [ 7.723148] input: Wacom HID 482F Finger as /devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-6/i2c-WCOM482F:00/0018:056A:482F.0006/input/input16
> [ 7.723611] wacom 0018:056A:482F.0006: hidraw0: I2C HID v1.00 Mouse [WCOM482F:00 056A:482F] on i2c-WCOM482F:00
> [ 7.768275] input: DLL077A:01 06CB:76AF Touchpad as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-7/i2c-DLL077A:01/0018:06CB:76AF.0007/input/input19
> [ 7.864201] hid-multitouch 0018:06CB:76AF.0007: input,hidraw0: I2C HID v1.00 Mouse [DLL077A:01 06CB:76AF] on i2c-DLL077A:01
>
> However in this state, I can't rmmod i2c-hid. It just hangs the system with this trace:
> [ 243.033779] INFO: task kworker/u8:0:6 blocked for more than 120 seconds.
> [ 243.033793] Not tainted 4.17.0-rc1+ #37
> [ 243.033798] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 243.033804] kworker/u8:0 D 0 6 2 0x80000000
> [ 243.033826] Workqueue: events_power_efficient power_supply_deferred_register_work
> [ 243.033832] Call Trace:
> [ 243.033850] __schedule+0x3c2/0x890
> [ 243.033861] ? __switch_to_asm+0x40/0x70
> [ 243.033868] schedule+0x36/0x80
> [ 243.033875] schedule_preempt_disabled+0xe/0x10
> [ 243.033882] __mutex_lock.isra.4+0x2ae/0x4e0
> [ 243.033890] ? __switch_to_asm+0x34/0x70
> [ 243.033899] ? __switch_to_asm+0x40/0x70
> [ 243.033906] ? __switch_to_asm+0x40/0x70
> [ 243.033914] __mutex_lock_slowpath+0x13/0x20
> [ 243.033920] ? __mutex_lock_slowpath+0x13/0x20
> [ 243.033927] mutex_lock+0x2f/0x40
> [ 243.033933] power_supply_deferred_register_work+0x2b/0x50
> [ 243.033944] process_one_work+0x148/0x3d0
> [ 243.033952] worker_thread+0x4b/0x460
> [ 243.033960] kthread+0x102/0x140
> [ 243.033967] ? rescuer_thread+0x380/0x380
> [ 243.033973] ? kthread_associate_blkcg+0xa0/0xa0
> [ 243.033982] ret_from_fork+0x35/0x40
> [ 243.034012] INFO: task systemd-udevd:308 blocked for more than 120 seconds.
> [ 243.034018] Not tainted 4.17.0-rc1+ #37
> [ 243.034022] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 243.034027] systemd-udevd D 0 308 279 0x80000104
> [ 243.034033] Call Trace:
> [ 243.034041] __schedule+0x3c2/0x890
> [ 243.034049] schedule+0x36/0x80
> [ 243.034056] schedule_timeout+0x1e7/0x360
> [ 243.034066] ? ttwu_do_activate+0x77/0x80
> [ 243.034074] wait_for_completion+0xb4/0x140
> [ 243.034082] ? wake_up_q+0x70/0x70
> [ 243.034090] flush_work+0x12a/0x1e0
> [ 243.034097] ? worker_detach_from_pool+0xb0/0xb0
> [ 243.034107] __cancel_work_timer+0x112/0x190
> [ 243.034116] cancel_delayed_work_sync+0x13/0x20
> [ 243.034122] power_supply_unregister+0x37/0xb0
> [ 243.034127] devm_power_supply_release+0x11/0x20
> [ 243.034135] release_nodes+0x107/0x1f0
> [ 243.034147] devres_release_group+0x7c/0xb0
> [ 243.034162] wacom_remove+0xce/0x120 [wacom]
> [ 243.034178] hid_device_remove+0x4d/0xa0 [hid]
> [ 243.034187] device_release_driver_internal+0x155/0x220
> [ 243.034198] ? __hid_bus_driver_added+0x40/0x40 [hid]
> [ 243.034208] ? hid_destroy_device+0x60/0x60 [hid]
> [ 243.034215] device_release_driver+0x12/0x20
> [ 243.034221] device_reprobe+0x30/0x50
> [ 243.034231] __hid_bus_reprobe_drivers+0x45/0x50 [hid]
> [ 243.034239] bus_for_each_dev+0x64/0xb0
> [ 243.034250] __hid_bus_driver_added+0x2c/0x40 [hid]
> [ 243.034256] bus_for_each_drv+0x67/0xb0
> [ 243.034267] __hid_register_driver+0x6f/0x80 [hid]
> [ 243.034275] ? 0xffffffffc07f5000
> [ 243.034287] mt_driver_init+0x23/0x1000 [hid_multitouch]
> [ 243.034296] do_one_initcall+0x4f/0x1ce
> [ 243.034303] ? _cond_resched+0x1a/0x50
> [ 243.034315] ? kmem_cache_alloc_trace+0xb8/0x1f0
> [ 243.034327] do_init_module+0x5f/0x219
> [ 243.034335] load_module+0x24c7/0x2be0
> [ 243.034348] __do_sys_finit_module+0xe5/0x120
> [ 243.034354] ? __do_sys_finit_module+0xe5/0x120
> [ 243.034363] __x64_sys_finit_module+0x1a/0x20
> [ 243.034370] do_syscall_64+0x54/0x110
> [ 243.034380] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 243.034386] RIP: 0033:0x7f2ec539c839
> [ 243.034390] RSP: 002b:00007ffcfc620298 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> [ 243.034396] RAX: ffffffffffffffda RBX: 000055d6a0147ec0 RCX: 00007f2ec539c839
> [ 243.034399] RDX: 0000000000000000 RSI: 00007f2ec507b0e5 RDI: 000000000000000f
> [ 243.034402] RBP: 00007f2ec507b0e5 R08: 0000000000000000 R09: 00007ffcfc6203b0
> [ 243.034405] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000000000
> [ 243.034408] R13: 000055d6a017b3a0 R14: 0000000000020000 R15: 000055d6a0147ec0
> --
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