usb: dwc3: ep0: don't change to configured state too early
before changing to configured state, we need
to wait until gadget driver has had a chance
to process the request.
In case of USB_GADGET_DELAYED_STATUS, that means
we need to defer usb_gadget_set_state() until
the upcoming usb_ep_queue().
Reported-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 007651c..7fa93f4 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -148,6 +148,7 @@
direction = !dwc->ep0_expect_in;
dwc->delayed_status = false;
+ usb_gadget_set_state(&dwc->gadget, USB_STATE_CONFIGURED);
if (dwc->ep0state == EP0_STATUS_PHASE)
__dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
@@ -533,8 +534,16 @@
ret = dwc3_ep0_delegate_req(dwc, ctrl);
/* if the cfg matches and the cfg is non zero */
if (cfg && (!ret || (ret == USB_GADGET_DELAYED_STATUS))) {
- usb_gadget_set_state(&dwc->gadget,
- USB_STATE_CONFIGURED);
+
+ /*
+ * only change state if set_config has already
+ * been processed. If gadget driver returns
+ * USB_GADGET_DELAYED_STATUS, we will wait
+ * to change the state on the next usb_ep_queue()
+ */
+ if (ret == 0)
+ usb_gadget_set_state(&dwc->gadget,
+ USB_STATE_CONFIGURED);
/*
* Enable transition to U1/U2 state when