On 2023-11-06 08:54:50 [+0000], Li, Meng wrote: > This is not my original issue that I encountered. > I agree that we should remove the device from sys interface firstly, > and then do hot-plug action. > My original issue was the calltrace on RT kernel if I remove the > device from sys interface. > # echo 1 > /sys/bus/pci/devices/0001:01:00.0/remove > xhci_hcd 0001:01:00.0: remove, state 1 > usb usb2: USB disconnect, device number 1 > usb 2-4: USB disconnect, device number 2 > xhci_hcd 0001:01:00.0: USB bus 2 deregistered > BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46 > in_atomic(): 0, irqs_disabled(): 128, non_block: 0, pid: 765, name: sh Right. > and then I checked the commit log to get which commit introduced this issue. > I found out the commit is > commit c548795abe0d3520b74e18f23ca0a0d72deddab9 > Author: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > Date: Wed Jun 9 17:34:27 2010 -0400 > > USB: add check to detect host controller hardware removal > > And then, Alan Stern told me the background of this issue. so, I > started to do hotplug operation on my board to see what symptom on my > nxp-ls1043/6 board. > And then there were lots of discussion followed. Okay. I somehow mapped it that you try to add this to xhci. The suggested replacement should cover it. Better if we could get rid of it ;) > Thanks, > Limeng Sebastian
