> > I've tested this on a pre-production ICL platform. This was on top of 5.3-rc5,
> both of
> > your patches from -next and this series.
> >
> > I've run into a problem when using
> > a WD19TB that after unplugging it will cause the following to spew in dmesg:
> >
> > [ 2198.017003] ============================================
> > [ 2198.017005] WARNING: possible recursive locking detected
> > [ 2198.017008] 5.3.0-rc5+ #75 Not tainted
> > [ 2198.017009] --------------------------------------------
> > [ 2198.017012] irq/122-pciehp/121 is trying to acquire lock:
> > [ 2198.017015] 00000000801d4de8 (&ctrl->reset_lock){.+.+}, at:
> pciehp_check_presence+0x1b/0x80
> > [ 2198.017026]
> > but task is already holding lock:
> > [ 2198.017028] 000000000899e2eb (&ctrl->reset_lock){.+.+}, at:
> pciehp_ist+0xaf/0x1c0
> > [ 2198.017033]
> > other info that might help us debug this:
> > [ 2198.017035] Possible unsafe locking scenario:
> >
> > [ 2198.017037] CPU0
> > [ 2198.017038] ----
> > [ 2198.017041] lock(&ctrl->reset_lock);
> > [ 2198.017044] lock(&ctrl->reset_lock);
> > [ 2198.017046]
> > *** DEADLOCK ***
> >
> > [ 2198.017048] May be due to missing lock nesting notation
> >
> > [ 2198.017051] 3 locks held by irq/122-pciehp/121:
> > [ 2198.017052] #0: 000000000899e2eb (&ctrl->reset_lock){.+.+}, at:
> pciehp_ist+0xaf/0x1c0
> > [ 2198.017057] #1: 0000000069e1fd47 (pci_rescan_remove_lock){+.+.}, at:
> pciehp_unconfigure_device+0x41/0x130
> > [ 2198.017064] #2: 0000000046a5bfbf (&dev->mutex){....}, at:
> device_release_driver_internal+0x1c/0x1a0
> > [ 2198.017071]
> > stack backtrace:
> > [ 2198.017075] CPU: 3 PID: 121 Comm: irq/122-pciehp Not tainted 5.3.0-rc5+ #75
> > [ 2198.017079] Call Trace:
> > [ 2198.017089] dump_stack+0x5e/0x8b
> > [ 2198.017096] __lock_acquire+0x12fe/0x1520
> > [ 2198.017102] lock_acquire+0x9d/0x1a0
> > [ 2198.017105] ? pciehp_check_presence+0x1b/0x80
> > [ 2198.017113] ? pci_restore_standard_config+0x40/0x40
> > [ 2198.017118] down_read+0x3b/0x160
> > [ 2198.017121] ? pciehp_check_presence+0x1b/0x80
> > [ 2198.017123] pciehp_check_presence+0x1b/0x80
> > [ 2198.017128] ? quirk_disable_msi.part.29+0x31/0x31
> > [ 2198.017131] pciehp_resume+0x27/0x30
> > [ 2198.017136] device_for_each_child+0x47/0x90
> > [ 2198.017140] ? pci_restore_standard_config+0x40/0x40
> > [ 2198.017145] pcie_port_device_runtime_resume+0x30/0x50
> > [ 2198.017150] pci_pm_runtime_resume+0x6e/0xc0
> > [ 2198.017156] __rpm_callback+0xb0/0x110
> > [ 2198.017161] ? pci_restore_standard_config+0x40/0x40
> > [ 2198.017165] rpm_callback+0x1f/0x70
> > [ 2198.017169] ? pci_restore_standard_config+0x40/0x40
> > [ 2198.017173] rpm_resume+0x4fe/0x690
> > [ 2198.017179] ? irq_forced_thread_fn+0x70/0x70
> > [ 2198.017183] __pm_runtime_resume+0x47/0x80
> > [ 2198.017187] device_release_driver_internal+0x7c/0x1a0
> > [ 2198.017191] pci_stop_bus_device+0x5d/0x80
> > [ 2198.017195] pci_stop_bus_device+0x2b/0x80
> > [ 2198.017198] pci_stop_and_remove_bus_device+0xe/0x20
> > [ 2198.017202] pciehp_unconfigure_device+0x7c/0x130
> > [ 2198.017206] pciehp_disable_slot+0x69/0x120
> > [ 2198.017211] pciehp_handle_presence_or_link_change+0x7d/0x4b0
> > [ 2198.017215] pciehp_ist+0x12a/0x1c0
> > [ 2198.017219] irq_thread_fn+0x1b/0x60
> > [ 2198.017222] irq_thread+0x15b/0x1c0
> > [ 2198.017226] ? lockdep_hardirqs_on+0x115/0x180
> > [ 2198.017229] ? wake_threads_waitq+0x30/0x30
> > [ 2198.017233] ? irq_thread_dtor+0x90/0x90
> > [ 2198.017237] kthread+0x101/0x140
> > [ 2198.017241] ? kthread_cancel_delayed_work_sync+0x10/0x10
> > [ 2198.017245] ret_from_fork+0x24/0x30
> > [ 2198.017897] xhci_hcd 0000:03:00.0: remove, state 1
> > [ 2198.017917] usb usb6: USB disconnect, device number 1
> > [ 2198.017925] usb 6-2: USB disconnect, device number 2
> > [ 2198.017932] usb 6-2.3: USB disconnect, device number 3
> > [ 2198.017939] usb 6-2.3.1: USB disconnect, device number 5
> > [ 2198.019565] sd 0:0:0:0: [sda] Synchronizing SCSI cache
> > [ 2198.019671] sd 0:0:0:0: [sda] Synchronize Cache(10) failed: Result:
> hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
> > [ 2198.057200] xhci_hcd 0000:03:00.0: xHCI host controller not responding,
> assume dead
> > [ 2198.057227] r8152 6-2.4:1.0 enxd8d090034dcb: Stop submitting intr, status -
> 108
> > [ 2198.057574] usb 6-2.4: USB disconnect, device number 4
> > [ 2198.074541] xhci_hcd 0000:03:00.0: USB bus 6 deregistered
> > [ 2198.074558] xhci_hcd 0000:03:00.0: remove, state 1
> > [ 2198.074564] usb usb5: USB disconnect, device number 1
> > [ 2198.074566] usb 5-2: USB disconnect, device number 2
> > [ 2198.074569] usb 5-2.3: USB disconnect, device number 3
> > [ 2198.074571] usb 5-2.3.4: USB disconnect, device number 5
> > [ 2198.077367] usb 5-2.3.5: USB disconnect, device number 6
> > [ 2198.078488] usb 5-2.5: USB disconnect, device number 4
> > [ 2198.080340] xhci_hcd 0000:03:00.0: Host halt failed, -19
> > [ 2198.080344] xhci_hcd 0000:03:00.0: Host not accessible, reset failed.
> > [ 2198.080770] xhci_hcd 0000:03:00.0: USB bus 5 deregistered
> > [ 2198.081153] pci 0000:03:00.0: Removing from iommu group 3
> > [ 2198.081180] pci_bus 0000:03: busn_res: [bus 03] is released
> > [ 2198.081287] pci 0000:02:02.0: Removing from iommu group 3
> > [ 2198.081396] pci_bus 0000:04: busn_res: [bus 04-2d] is released
> > [ 2198.081509] pci 0000:02:04.0: Removing from iommu group 3
> > [ 2198.082273] pci_bus 0000:02: busn_res: [bus 02-2d] is released
> > [ 2198.085759] pci 0000:01:00.0: Removing from iommu group 3
> > [ 2198.630098] thunderbolt 0-1: device disconnected
> >
> > Additionally I've found after this I can't get the dock to work by hotplugging
> again
> > until I reboot the system.
>
> Can you try if the following patch helps?
>
> https://lore.kernel.org/patchwork/patch/1113961/
I just checked with that patch on top of my previous test kernel, same call trace
situation.
