Commit c2da2ff0 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Felipe Balbi
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usb: dwc3: ep0: don't use ep0in for transfers 



In "usb: dwc3: remove special status request handling in ep0" I simplied
a few things and used the generic API for the status transfers. The bug
I introcuded here is that we queue now requests to dep[1] but we don't
clear that list in the stall+start case.
Actually we don't need to use dep[1] at all. We only did in the past to
talk to the correct endpoint (i.e. in or out). This is now take care of
in a diffent place within the ep0 code. So we could queue the in
transfers to dep[0] and don't use dep[1] at all.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 1e7618d8

drivers/usb/dwc3/ep0.c

+8 −10
Original line number Diff line number Diff line
@@ -190,8 +190,7 @@ int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request, 
	}



	/* we share one TRB for ep0/1 */

	if (!list_empty(&dwc->eps[0]->request_list) ||

			!list_empty(&dwc->eps[1]->request_list)) {

	if (!list_empty(&dep->request_list)) {

		ret = -EBUSY;

		goto out;

	}
@@ -213,8 +212,8 @@ static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc) 
	struct dwc3_ep		*dep = dwc->eps[0];



	/* stall is always issued on EP0 */

	__dwc3_gadget_ep_set_halt(dwc->eps[0], 1);

	dwc->eps[0]->flags = DWC3_EP_ENABLED;

	__dwc3_gadget_ep_set_halt(dep, 1);

	dep->flags = DWC3_EP_ENABLED;



	if (!list_empty(&dep->request_list)) {

		struct dwc3_request	*req;
@@ -300,7 +299,7 @@ static int dwc3_ep0_handle_status(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl 
	dwc->ep0_usb_req.length = sizeof(*response_pkt);

	dwc->ep0_usb_req.dma = dwc->setup_buf_addr;

	dwc->ep0_usb_req.complete = dwc3_ep0_status_cmpl;

	return usb_ep_queue(&dwc->eps[1]->endpoint, &dwc->ep0_usb_req,

	return usb_ep_queue(&dwc->eps[0]->endpoint, &dwc->ep0_usb_req,

			GFP_ATOMIC);

}
@@ -552,22 +551,21 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc, 
	struct dwc3_request	*r = NULL;

	struct usb_request	*ur;

	struct dwc3_trb		trb;

	struct dwc3_ep		*dep;

	struct dwc3_ep		*ep0;

	u32			transferred;

	u8			epnum;



	epnum = event->endpoint_number;

	dep = dwc->eps[epnum];

	ep0 = dwc->eps[0];



	dwc->ep0_next_event = DWC3_EP0_NRDY_STATUS;



	r = next_request(&dwc->eps[0]->request_list);

	r = next_request(&ep0->request_list);

	ur = &r->request;



	dwc3_trb_to_nat(dwc->ep0_trb, &trb);



	if (dwc->ep0_bounced) {

		struct dwc3_ep	*ep0 = dwc->eps[0];



		transferred = min_t(u32, ur->length,

				ep0->endpoint.maxpacket - trb.length);
@@ -588,7 +586,7 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc, 
		 * seems to be case when req.length > maxpacket. Could it be?

		 */

		if (r)

			dwc3_gadget_giveback(dep, r, 0);

			dwc3_gadget_giveback(ep0, r, 0);

	}

}

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