Revert "USB: EHCI: fix HUB TT scheduling issue with iso transfer"
Greg Kroah-Hartman [Mon, 28 Nov 2011 22:40:10 +0000 (07:40 +0900)]
This reverts commit f0cc710a6dec5b808a6f13f1f8853c094fce5f12.

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

index afef3df..29bec34 100644 (file)
@@ -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) {