usb: dwc3: ep0: Don't reset resource alloc flag

commit f2e0eee4703869dc5edb5302a919861566ca7797 upstream.

The DWC3_EP_RESOURCE_ALLOCATED flag ensures that the resource of an
endpoint is only assigned once. Unless the endpoint is reset, don't
clear this flag. Otherwise we may set endpoint resource again, which
prevents the driver from initiate transfer after handling a STALL or
endpoint halt to the control endpoint.

Cc: [email protected]
Fixes: b311048c174d ("usb: dwc3: gadget: Rewrite endpoint allocation flow")
Signed-off-by: Thinh Nguyen <[email protected]>
Link: https://lore.kernel.org/r/00122b7cc5be06abef461776e7cc9f5ebc8bc1cb.1713229786.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Thinh Nguyen

drivers/usb/dwc3/ep0.c

@@ -224,7 +224,8 @@ void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
 
 	/* reinitialize physical ep1 */
 	dep = dwc->eps[1];
-	dep->flags = DWC3_EP_ENABLED;
+	dep->flags &= DWC3_EP_RESOURCE_ALLOCATED;
+	dep->flags |= DWC3_EP_ENABLED;
 
 	/* stall is always issued on EP0 */
 	dep = dwc->eps[0];