6.14-stable review patch. If anyone has any objections, please let me know.
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From: Michal Pecio michal.pecio@gmail.com
[ Upstream commit bfa8459942822bdcc86f0e87f237c0723ae64948 ]
Missed Service Error after an error mid TD means that the failed TD has already been passed by the xHC without acknowledgment of the final TRB, a known hardware bug. So don't wait any more and give back the TD.
Reproduced on NEC uPD720200 under conditions of ludicrously bad USB link quality, confirmed to behave as expected using dynamic debug.
Signed-off-by: Michal Pecio michal.pecio@gmail.com Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20250306144954.3507700-5-mathias.nyman@linux.intel... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/host/xhci-ring.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index c64316638350e..7721215be79ff 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2789,7 +2789,7 @@ static int handle_tx_event(struct xhci_hcd *xhci, xhci_dbg(xhci, "Miss service interval error for slot %u ep %u, set skip flag\n", slot_id, ep_index); - return 0; + break; case COMP_NO_PING_RESPONSE_ERROR: ep->skip = true; xhci_dbg(xhci, @@ -2837,6 +2837,10 @@ static int handle_tx_event(struct xhci_hcd *xhci, xhci_dequeue_td(xhci, td, ep_ring, td->status); }
+ /* Missed TDs will be skipped on the next event */ + if (trb_comp_code == COMP_MISSED_SERVICE_ERROR) + return 0; + if (list_empty(&ep_ring->td_list)) { /* * Don't print wanings if ring is empty due to a stopped endpoint generating an