[PATCH] USB: DWC3: fix implementation of endpoint wedge

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

The dwc3 UDC driver doesn't implement endpoint wedging correctly.
When an endpoint is wedged, the gadget driver should be allowed to
clear the wedge by calling usb_ep_clear_halt().  Only the host is
prevented from resetting the endpoint.

This patch fixes the implementation.

Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Tested-by: Pratyush Anand <pratyush.anand@xxxxxx>
CC: <stable@xxxxxxxxxxxxxxx>

---

[as1732]

 drivers/usb/dwc3/ep0.c    |    2 ++
 drivers/usb/dwc3/gadget.c |    5 +----
 2 files changed, 3 insertions(+), 4 deletions(-)

Index: usb-3.12/drivers/usb/dwc3/ep0.c
===================================================================
--- usb-3.12.orig/drivers/usb/dwc3/ep0.c
+++ usb-3.12/drivers/usb/dwc3/ep0.c
@@ -459,6 +459,8 @@ static int dwc3_ep0_handle_feature(struc
 			dep = dwc3_wIndex_to_dep(dwc, wIndex);
 			if (!dep)
 				return -EINVAL;
+			if (set == 0 && (dep->flags & DWC3_EP_WEDGE))
+				break;
 			ret = __dwc3_gadget_ep_set_halt(dep, set);
 			if (ret)
 				return -EINVAL;
Index: usb-3.12/drivers/usb/dwc3/gadget.c
===================================================================
--- usb-3.12.orig/drivers/usb/dwc3/gadget.c
+++ usb-3.12/drivers/usb/dwc3/gadget.c
@@ -1200,9 +1200,6 @@ int __dwc3_gadget_ep_set_halt(struct dwc
 		else
 			dep->flags |= DWC3_EP_STALL;
 	} else {
-		if (dep->flags & DWC3_EP_WEDGE)
-			return 0;
-
 		ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
 			DWC3_DEPCMD_CLEARSTALL, &params);
 		if (ret)
@@ -1210,7 +1207,7 @@ int __dwc3_gadget_ep_set_halt(struct dwc
 					value ? "set" : "clear",
 					dep->name);
 		else
-			dep->flags &= ~DWC3_EP_STALL;
+			dep->flags &= ~(DWC3_EP_STALL | DWC3_EP_WEDGE);
 	}
 
 	return ret;

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