[REGRESSION 6.16] xHCI host not responding to stop endpoint command after suspend and resume

["Michał Pecio" <michal.pecio@gmail.com>]

Hi,

Two Arch Linux users reported that a suspend cycle makes their xHCI
controllers die since the 6.16 release.

Link:
https://bbs.archlinux.org/viewtopic.php?id=307641

Posted log snippet:
Aug 16 12:12:53 talc kernel: xhci_hcd 0000:00:14.0: xHCI host not responding to stop endpoint command
Aug 16 12:12:53 talc kernel: xhci_hcd 0000:00:14.0: xHCI host controller not responding, assume dead
Aug 16 12:12:53 talc kernel: xhci_hcd 0000:00:14.0: HC died; cleaning up
Aug 16 12:12:53 talc kernel: usb 1-8: PM: dpm_run_callback(): usb_dev_resume returns -22
Aug 16 12:12:53 talc kernel: usb 1-5: PM: dpm_run_callback(): usb_dev_resume returns -5
Aug 16 12:12:53 talc kernel: usb 1-5: PM: failed to resume async: error -5
Aug 16 12:12:53 talc kernel: usb 1-8: PM: failed to resume async: error -22
Aug 16 12:12:53 talc kernel: OOM killer enabled.
Aug 16 12:12:53 talc kernel: Restarting tasks: Starting
Aug 16 12:12:53 talc kernel: mei_hdcp 0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04: bound 0000:00:02.0 (ops i915_hdcp_ops [i915])
Aug 16 12:12:53 talc kernel: usb 1-5: USB disconnect, device number 3
Aug 16 12:12:53 talc kernel: Restarting tasks: Done
Aug 16 12:12:53 talc kernel: random: crng reseeded on system resumption
Aug 16 12:12:53 talc kernel: usb 1-8: USB disconnect, device number 4
Aug 16 12:12:53 talc kernel: PM: suspend exit

I tried suspending my PC packed with several xHCs and none of them died,
so it may be hardware specific. The log shows this Intel PCI ID:

Aug 16 12:07:31 talc kernel: pci 0000:00:14.0: [8086:4ded] type 00 class 0x0c0330 conventional PCI endpoint


A bisect effort is ongoing and c0c9379f235d ("Merge tag 'usb-6.16-rc1'
of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb") is bad,
so that's where the bug likely came from.

Any ideas what it could be? I have none, looks like it may be another
utterly unobvious issue from a trivial cleanup patch.

Christian (Cc) is the Arch package maintainer helping track this down.

Regards,
Michal