Revert "USB: EHCI: fix HUB TT scheduling issue with iso transfer"

This reverts commit f0cc710a.

Cc: Matthieu Castet <matthieu.castet@parrot.com>
Cc: Thomas Poussevin <thomas.poussevin@parrot.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/ehci-sched.c

@@ -1480,15 +1480,10 @@ iso_stream_schedule (
 
 		/* NOTE:  assumes URB_ISO_ASAP, to limit complexity/bugs */
 
-		/* find a uframe slot with enough bandwidth.
-		 * Early uframes are more precious because full-speed
-		 * iso IN transfers can't use late uframes,
-		 * and therefore they should be allocated last.
-		 */
-		next = start;
-		start += period;
-		do {
-			start--;
+		/* find a uframe slot with enough bandwidth */
+		next = start + period;
+		for (; start < next; start++) {
+
 			/* check schedule: enough space? */
 			if (stream->highspeed) {
 				if (itd_slot_ok(ehci, mod, start,
@@ -1501,7 +1496,7 @@ iso_stream_schedule (
 						start, sched, period))
 					break;
 			}
-		} while (start > next);
+		}
 
 		/* no room in the schedule */
 		if (start == next) {