staging: unisys: Process more than one response per check

When s-Par is in polling mode it checks every 2 ms to see if there is
a response from the IO service partition in the queue. Currently it
just reads one entry per 2 ms, this needs to be changed so it drains
the queue on each check.
Signed-off-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visornic/visornic_main.c

@@ -1629,10 +1629,11 @@ drain_queue(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata)
 
 	/* TODO: CLIENT ACQUIRE -- Don't really need this at the
 	 * moment */
+	for (;;) {
 		if (!visorchannel_signalremove(devdata->dev->visorchannel,
 					       IOCHAN_FROM_IOPART,
 					       cmdrsp))
-		return; /* queue empty */
+			break; /* queue empty */
 
 		switch (cmdrsp->net.type) {
 		case NET_RCV:
@@ -1716,6 +1717,7 @@ drain_queue(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata)
 			break;
 		}
 		/* cmdrsp is now available for reuse  */
+	}
 }
 
 /**