Hi Jim, Jim Lin <jilin@xxxxxxxxxx> writes: > After a device is disconnected, xhci_stop_device() will be invoked > in xhci_bus_suspend(). > Also the "disconnect" IRQ will have ISR to invoke > xhci_free_virt_device() in this sequence. > xhci_irq -> xhci_handle_event -> handle_cmd_completion -> > xhci_handle_cmd_disable_slot -> xhci_free_virt_device > > If xhci->devs[slot_id] has been assigned to NULL in > xhci_free_virt_device(), then virt_dev->eps[i].ring in > xhci_stop_device() may point to an invlid address to cause kernel > panic. > > virt_dev = xhci->devs[slot_id]; > : > if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue) > > [] Unable to handle kernel paging request at virtual address 00001a68 > [] pgd=ffffffc001430000 > [] [00001a68] *pgd=000000013c807003, *pud=000000013c807003, > *pmd=000000013c808003, *pte=0000000000000000 > [] Internal error: Oops: 96000006 [#1] PREEMPT SMP > [] CPU: 0 PID: 39 Comm: kworker/0:1 Tainted: G U > [] Workqueue: pm pm_runtime_work > [] task: ffffffc0bc0e0bc0 ti: ffffffc0bc0ec000 task.ti: > ffffffc0bc0ec000 > [] PC is at xhci_stop_device.constprop.11+0xb4/0x1a4 > > This issue is found when running with realtek ethernet device > (0bda:8153). > > Signed-off-by: Jim Lin <jilin@xxxxxxxxxx> yes, I saw the previous version :-) So, we're pretty close to getting the merge window opened. This will defer to v4.8-rc1. Patch looks good, though. :-) thanks -- balbi
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