From 6f64f0ae230f9e8f68c5d9bf56ffee438fa60a6a Mon Sep 17 00:00:00 2001 From: Hector Martin Date: Sun, 29 Oct 2023 15:37:40 +0900 Subject: [PATCH] usb: xhci: Allow context state errors when halting an endpoint There is a race where an endpoint may halt by itself while we are trying to halt it, which results in a context state error. See xHCI 4.6.9 which mentions this case. This also avoids BUGging when we attempt to stop an endpoint which was already stopped to begin with, which is probably a bug elsewhere but not a good reason to crash. Signed-off-by: Hector Martin Reviewed-by: Marek Vasut --- drivers/usb/host/xhci-ring.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index d21e76e0bd..e02a6e300c 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -545,6 +545,7 @@ static void abort_td(struct usb_device *udev, int ep_index) struct xhci_ctrl *ctrl = xhci_get_ctrl(udev); struct xhci_ring *ring = ctrl->devs[udev->slot_id]->eps[ep_index].ring; union xhci_trb *event; + xhci_comp_code comp; trb_type type; u64 addr; u32 field; @@ -573,10 +574,11 @@ static void abort_td(struct usb_device *udev, int ep_index) printf("abort_td: Expected a TRB_TRANSFER TRB first\n"); } + comp = GET_COMP_CODE(le32_to_cpu(event->event_cmd.status)); BUG_ON(type != TRB_COMPLETION || TRB_TO_SLOT_ID(le32_to_cpu(event->event_cmd.flags)) - != udev->slot_id || GET_COMP_CODE(le32_to_cpu( - event->event_cmd.status)) != COMP_SUCCESS); + != udev->slot_id || (comp != COMP_SUCCESS && comp + != COMP_CTX_STATE)); xhci_acknowledge_event(ctrl); addr = xhci_trb_virt_to_dma(ring->enq_seg, -- 2.39.5