From: Michal Pecio <michal.pecio@xxxxxxxxx> 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. Link: https://bugzilla.kernel.org/show_bug.cgi?id=219824 Fixes: 36b972d4b7ce ("usb: xhci: improve xhci_clear_command_ring()") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Michal Pecio <michal.pecio@xxxxxxxxx> Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20250304113147.3322584-2-mathias.nyman@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/host/xhci.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -779,8 +779,12 @@ static void xhci_clear_command_ring(stru struct xhci_segment *seg; ring = xhci->cmd_ring; - xhci_for_each_ring_seg(ring->first_seg, seg) + xhci_for_each_ring_seg(ring->first_seg, seg) { + /* erase all TRBs before the link */ memset(seg->trbs, 0, sizeof(union xhci_trb) * (TRBS_PER_SEGMENT - 1)); + /* clear link cycle bit */ + seg->trbs[TRBS_PER_SEGMENT - 1].link.control &= cpu_to_le32(~TRB_CYCLE); + } xhci_initialize_ring_info(ring); /* Patches currently in stable-queue which might be from michal.pecio@xxxxxxxxx are queue-6.13/usb-xhci-fix-host-controllers-dying-after-suspend-and-resume.patch queue-6.13/usb-xhci-enable-the-trb-overfetch-quirk-on-via-vl805.patch
