USB: musb_gadget: implement set_wedge() method

Implement the driver's set_wedge() method by adding the 'wedged' flag
to the 'struct musb_ep'.
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/musb/musb_gadget.c

@@ -966,6 +966,7 @@ static int musb_gadget_enable(struct usb_ep *ep,
 
 	musb_ep->desc = desc;
 	musb_ep->busy = 0;
+	musb_ep->wedged = 0;
 	status = 0;
 
 	pr_debug("%s periph: enabled %s for %s %s, %smaxpacket %d\n",
@@ -1262,7 +1263,8 @@ int musb_gadget_set_halt(struct usb_ep *ep, int value)
 				goto done;
 			}
 		}
-	}
+	} else
+		musb_ep->wedged = 0;
 
 	/* set/clear the stall and toggle bits */
 	DBG(2, "%s: %s stall\n", ep->name, value ? "set" : "clear");
@@ -1301,6 +1303,21 @@ done:
 	return status;
 }
 
+/*
+ * Sets the halt feature with the clear requests ignored
+ */
+int musb_gadget_set_wedge(struct usb_ep *ep)
+{
+	struct musb_ep		*musb_ep = to_musb_ep(ep);
+
+	if (!ep)
+		return -EINVAL;
+
+	musb_ep->wedged = 1;
+
+	return usb_ep_set_halt(ep);
+}
+
 static int musb_gadget_fifo_status(struct usb_ep *ep)
 {
 	struct musb_ep		*musb_ep = to_musb_ep(ep);
@@ -1371,6 +1388,7 @@ static const struct usb_ep_ops musb_ep_ops = {
 	.queue		= musb_gadget_queue,
 	.dequeue	= musb_gadget_dequeue,
 	.set_halt	= musb_gadget_set_halt,
+	.set_wedge	= musb_gadget_set_wedge,
 	.fifo_status	= musb_gadget_fifo_status,
 	.fifo_flush	= musb_gadget_fifo_flush
 };

drivers/usb/musb/musb_gadget.h

@@ -75,6 +75,8 @@ struct musb_ep {
 	/* later things are modified based on usage */
 	struct list_head		req_list;
 
+	u8				wedged;
+
 	/* true if lock must be dropped but req_list may not be advanced */
 	u8				busy;
 };

drivers/usb/musb/musb_gadget_ep0.c

@@ -273,6 +273,11 @@ __acquires(musb->lock)
 				if (!musb_ep->desc)
 					break;
 
+				handled = 1;
+				/* Ignore request if endpoint is wedged */
+				if (musb_ep->wedged)
+					break;
+
 				/* REVISIT do it directly, no locking games */
 				spin_unlock(&musb->lock);
 				musb_gadget_set_halt(&musb_ep->end_point, 0);
@@ -280,7 +285,6 @@ __acquires(musb->lock)
 
 				/* select ep0 again */
 				musb_ep_select(mbase, 0);
-				handled = 1;
 				} break;
 			default:
 				/* class, vendor, etc ... delegate */