[REGRESSION] Long boot times due to USB enumeration

[Seïfane Idouchach]

Dear all,

I am reporting what I believe to be regression due to
c0a40097f0bc81deafc15f9195d1fb54595cd6d0.

After this change I am experiencing long boot times on a setup that
has what seems like a bad usb.
The progress of the boot gets halted while retrying (and ultimately
failing) to enumerate the USB device and is only allowed to continue
after giving up enumerating the USB device.
On Arch Linux this manifests itself by a message from SystemD having a
wait job on journald. Journald starts just after the enumeration fails
with "unable to enumerate USB device".
This results in longer boot times on average 1 minute longer than
usual (usually around 10s).
No stable kernel before this change exhibits the issue all stable
kernels after this change exhibit the issue.

See the related USB messages attached below (these messages are
continuous and have not been snipped) :

[...]
[    9.640854] usb 1-9: device descriptor read/64, error -110
[   25.147505] usb 1-9: device descriptor read/64, error -110
[   25.650779] usb 1-9: new high-speed USB device number 5 using xhci_hcd
[   30.907482] usb 1-9: device descriptor read/64, error -110
[   46.480900] usb 1-9: device descriptor read/64, error -110
[   46.589883] usb usb1-port9: attempt power cycle
[   46.990815] usb 1-9: new high-speed USB device number 6 using xhci_hcd
[   51.791571] usb 1-9: Device not responding to setup address.
[   56.801594] usb 1-9: Device not responding to setup address.
[   57.010803] usb 1-9: device not accepting address 6, error -71
[   57.137485] usb 1-9: new high-speed USB device number 7 using xhci_hcd
[   61.937624] usb 1-9: Device not responding to setup address.
[   66.947485] usb 1-9: Device not responding to setup address.
[   67.154086] usb 1-9: device not accepting address 7, error -71
[   67.156426] usb usb1-port9: unable to enumerate USB device
[...]

This issue does not manifest in 44a45be57f85.
I am available to test any patches to address this on my system since
I understand this could be quite hard to replicate on any system.
I am available to provide more information if I am able or with
guidance to help troubleshoot the issue further.

Wishing you all a good day.

#regzbot introduced: c0a40097f0bc81deafc15f9195d1fb54595cd6d0