Commit 8d99087c authored by Thinh Nguyen's avatar Thinh Nguyen Committed by Felipe Balbi
Browse files

usb: dwc3: gadget: Properly handle failed kick_transfer 



If dwc3 fails to issue START_TRANSFER/UPDATE_TRANSFER command, then we
should properly end an active transfer and give back all the started
requests. However if it's for an isoc endpoint, the failure maybe due to
bus-expiry status. In this case, don't give back the requests and wait
for the next retry.

Fixes: 72246da4 ("usb: Introduce DesignWare USB3 DRD Driver")
Signed-off-by: default avatarThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <balbi@kernel.org>
parent 8bb14308

drivers/usb/dwc3/gadget.c

+16 −8
Original line number Diff line number Diff line
@@ -1220,6 +1220,8 @@ static void dwc3_prepare_trbs(struct dwc3_ep *dep) 
	}

}



static void dwc3_gadget_ep_cleanup_cancelled_requests(struct dwc3_ep *dep);



static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)

{

	struct dwc3_gadget_ep_cmd_params params;
@@ -1259,14 +1261,20 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep) 


	ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);

	if (ret < 0) {

		/*

		 * FIXME we need to iterate over the list of requests

		 * here and stop, unmap, free and del each of the linked

		 * requests instead of what we do now.

		 */

		if (req->trb)

			memset(req->trb, 0, sizeof(struct dwc3_trb));

		dwc3_gadget_del_and_unmap_request(dep, req, ret);

		struct dwc3_request *tmp;



		if (ret == -EAGAIN)

			return ret;



		dwc3_stop_active_transfer(dep, true, true);



		list_for_each_entry_safe(req, tmp, &dep->started_list, list)

			dwc3_gadget_move_cancelled_request(req);



		/* If ep isn't started, then there's no end transfer pending */

		if (!(dep->flags & DWC3_EP_END_TRANSFER_PENDING))

			dwc3_gadget_ep_cleanup_cancelled_requests(dep);



		return ret;

	}