usb: musb: gadget: complete request only if data is transfered over

Complete the current request only if the data transfer is over.
Signed-off-by: NMing Lei <tom.leiming@gmail.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Anand Gadiyar <gadiyar@ti.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/musb/musb_gadget.c

@@ -501,9 +501,8 @@ void musb_g_tx(struct musb *musb, u8 epnum)
 				request->zero = 0;
 			}
 
-			/* ... or if not, then complete it. */
+			if (request->actual == request->length) {
 				musb_g_giveback(musb_ep, request, 0);
-
 				request = musb_ep->desc ? next_request(musb_ep) : NULL;
 				if (!request) {
 					DBG(4, "%s idle now\n",
@@ -511,6 +510,7 @@ void musb_g_tx(struct musb *musb, u8 epnum)
 					return;
 				}
 			}
+		}
 
 		txstate(musb, to_musb_request(request));
 	}