linux-kernel - re : 3.2-rc2 regression due to commit "USB: EHCI: fix HUB TT scheduling issue with iso transfer" 811c926c

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Date:	Sat, 26 Nov 2011 23:13:04 +0100
From:	matthieu castet <castet.matthieu@...e.fr>
To:	Sander Eikelenboom <linux@...elenboom.it>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: re : 3.2-rc2 regression due to commit "USB: EHCI: fix HUB TT
 scheduling issue with iso transfer" 811c926c

Hi,

could you try the following patch ?

It seems there is a flow in the error condition.


Matthieu


diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 56a3203..464b451 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -1475,6 +1475,7 @@ iso_stream_schedule (
 	 * jump until after the queue is primed.
 	 */
 	else {
+		int done = 0;
 		start = SCHEDULE_SLOP + (now & ~0x07);
 
 		/* NOTE:  assumes URB_ISO_ASAP, to limit complexity/bugs */
@@ -1491,19 +1492,23 @@ iso_stream_schedule (
 			/* check schedule: enough space? */
 			if (stream->highspeed) {
 				if (itd_slot_ok(ehci, mod, start,
-						stream->usecs, period))
+						stream->usecs, period)) {
+					done = 1;
 					break;
+				}
 			} else {
 				if ((start % 8) >= 6)
 					continue;
 				if (sitd_slot_ok(ehci, mod, stream,
-						start, sched, period))
+						start, sched, period)) {
+					done = 1;
 					break;
+				}
 			}
 		} while (start > next);
 
 		/* no room in the schedule */
-		if (start == next) {
+		if (!done) {
 			ehci_dbg(ehci, "iso resched full %p (now %d max %d)\n",
 				urb, now, now + mod);
 			status = -ENOSPC;
--
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