usb: cdnsp: Fix incorrect usb_request status

Fix changes incorrect usb_request->status returned during disabling
endpoints. Before fix the status returned during dequeuing requests
while disabling endpoint was ECONNRESET.
Patch change it to ESHUTDOWN.

Patch fixes issue detected during testing UVC gadget.
During stopping streaming the class starts dequeuing usb requests and
controller driver returns the -ECONNRESET status. After completion
requests the class or application "uvc-gadget" try to queue this
request again. Changing this status to ESHUTDOWN cause that UVC assumes
that endpoint is disabled, or device is disconnected and stops
re-queuing usb requests.

Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
cc: stable@vger.kernel.org
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
Reviewed-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/PH7PR07MB9538E8CA7A2096AAF6A3718FDD9E2@PH7PR07MB9538.namprd07.prod.outlook.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c
index dbd83d321bca01f8840e08c484c87ec95d7d174d..46852529499d16e4e4271c86d0af271e129e04c5 100644 (file)
--- a/drivers/usb/cdns3/cdnsp-ring.c
+++ b/drivers/usb/cdns3/cdnsp-ring.c
@@ -718,7 +718,8 @@ int cdnsp_remove_request(struct cdnsp_device *pdev,
        seg = cdnsp_trb_in_td(pdev, cur_td->start_seg, cur_td->first_trb,
                              cur_td->last_trb, hw_deq);
 
-       if (seg && (pep->ep_state & EP_ENABLED))
+       if (seg && (pep->ep_state & EP_ENABLED) &&
+           !(pep->ep_state & EP_DIS_IN_RROGRESS))
                cdnsp_find_new_dequeue_state(pdev, pep, preq->request.stream_id,
                                             cur_td, &deq_state);
        else
@@ -736,7 +737,8 @@ int cdnsp_remove_request(struct cdnsp_device *pdev,
         * During disconnecting all endpoint will be disabled so we don't
         * have to worry about updating dequeue pointer.
         */
-       if (pdev->cdnsp_state & CDNSP_STATE_DISCONNECT_PENDING) {
+       if (pdev->cdnsp_state & CDNSP_STATE_DISCONNECT_PENDING ||
+           pep->ep_state & EP_DIS_IN_RROGRESS) {
                status = -ESHUTDOWN;
                ret = cdnsp_cmd_set_deq(pdev, pep, &deq_state);
        }