https://bugzilla.kernel.org/show_bug.cgi?id=219824 --- Comment #22 from Artem S. Tashkinov (aros@xxxxxxx) --- 6.13.7 absolutely includes it: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.7 > commit 80cb8e694110dee4ac6fbf0956ba7439aeb0603d > Author: Michal Pecio <michal.pecio@xxxxxxxxx> > Date: Tue Mar 4 13:31:47 2025 +0200 > > usb: xhci: Fix host controllers "dying" after suspend and resume > > commit c7c1f3b05c67173f462d73d301d572b3f9e57e3b upstream. > > A recent cleanup went a bit too far and dropped clearing the cycle bit > of link TRBs, so it stays different from the rest of the ring half of > the time. Then a race occurs: if the xHC reaches such link TRB before > more commands are queued, the link's cycle bit unintentionally matches > the xHC's cycle so it follows the link and waits for further commands. > If more commands are queued before the xHC gets there, inc_enq() flips > the bit so the xHC later sees a mismatch and stops executing commands. > > This function is called before suspend and 50% of times after resuming > the xHC is doomed to get stuck sooner or later. Then some Stop Endpoint > command fails to complete in 5 seconds and this shows up > > xhci_hcd 0000:00:10.0: xHCI host not responding to stop endpoint command > xhci_hcd 0000:00:10.0: xHCI host controller not responding, assume dead > xhci_hcd 0000:00:10.0: HC died; cleaning up > > followed by loss of all USB decives on the affected bus. That's if you > are lucky, because if Set Deq gets stuck instead, the failure is silent. > > Likely responsible for kernel bug 219824. I found this while searching > for possible causes of that regression and reproduced it locally before > hearing back from the reporter. To repro, simply wait for link cycle to > become set (debugfs), then suspend, resume and wait. To accelerate the > failure I used a script which repeatedly starts and stops a UVC camera. > > Some HCs get fully reinitialized on resume and they are not affected. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
