usb: dwc3: add cancelled reasons for dwc3 requests

Currently, when dwc3 handles request cancelled, dwc3 just returns
-ECONNRESET for all requests. It will cause USB function drivers
can't know if the requests are cancelled by other reasons.

This patch will replace DWC3_REQUEST_STATUS_CANCELLED with the
reasons below.
  - DWC3_REQUEST_STATUS_DISCONNECTED
  - DWC3_REQUEST_STATUS_DEQUEUED
  - DWC3_REQUEST_STATUS_STALLED

Reviewed-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Ray Chi <raychi@google.com>
Link: https://lore.kernel.org/r/20210327181742.1810969-1-raychi@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 20 insertions, 4 deletions

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 1a0d53e245f0..76a475b98314 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1402,7 +1402,7 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
 		dwc3_stop_active_transfer(dep, true, true);
 
 		list_for_each_entry_safe(req, tmp, &dep->started_list, list)
-			dwc3_gadget_move_cancelled_request(req);
+			dwc3_gadget_move_cancelled_request(req, DWC3_REQUEST_STATUS_DEQUEUED);
 
 		/* If ep isn't started, then there's no end transfer pending */
 		if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))
@@ -1729,10 +1729,25 @@ static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep)
 {
 	struct dwc3_request		*req;
 	struct dwc3_request		*tmp;
+	struct dwc3			*dwc = dep->dwc;
 
 	list_for_each_entry_safe(req, tmp, &dep->cancelled_list, list) {
 		dwc3_gadget_ep_skip_trbs(dep, req);
-		dwc3_gadget_giveback(dep, req, -ECONNRESET);
+		switch (req->status) {
+		case DWC3_REQUEST_STATUS_DISCONNECTED:
+			dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
+			break;
+		case DWC3_REQUEST_STATUS_DEQUEUED:
+			dwc3_gadget_giveback(dep, req, -ECONNRESET);
+			break;
+		case DWC3_REQUEST_STATUS_STALLED:
+			dwc3_gadget_giveback(dep, req, -EPIPE);
+			break;
+		default:
+			dev_err(dwc->dev, "request cancelled with wrong reason:%d\n", req->status);
+			dwc3_gadget_giveback(dep, req, -ECONNRESET);
+			break;
+		}
 	}
 }
 
@@ -1776,7 +1791,8 @@ static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
 			 * cancelled.
 			 */
 			list_for_each_entry_safe(r, t, &dep->started_list, list)
-				dwc3_gadget_move_cancelled_request(r);
+				dwc3_gadget_move_cancelled_request(r,
+						DWC3_REQUEST_STATUS_DEQUEUED);
 
 			dep->flags &= ~DWC3_EP_WAIT_TRANSFER_COMPLETE;
 
@@ -1848,7 +1864,7 @@ int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value, int protocol)
 		dwc3_stop_active_transfer(dep, true, true);
 
 		list_for_each_entry_safe(req, tmp, &dep->started_list, list)
-			dwc3_gadget_move_cancelled_request(req);
+			dwc3_gadget_move_cancelled_request(req, DWC3_REQUEST_STATUS_STALLED);
 
 		if (dep->flags & DWC3_EP_END_TRANSFER_PENDING) {
 			dep->flags |= DWC3_EP_PENDING_CLEAR_STALL;