From e3420901eba65b1c46bed86d360e3a8685d20734 Mon Sep 17 00:00:00 2001 From: Matthieu CASTET Date: Mon, 28 Nov 2011 11:30:22 +0100 Subject: [PATCH] EHCI : Fix a regression in the ISO scheduler Fix a regression that was introduced by commit 811c926c538f7e8d3c08b630dd5844efd7e000f6 (USB: EHCI: fix HUB TT scheduling issue with iso transfer). We detect an error if next == start, but this means uframe 0 can't be allocated anymore for iso transfer... Reported-by: Sander Eikelenboom Signed-off-by: Matthieu CASTET Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-sched.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index 56a32033adb..a60679cbbf8 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 */ @@ -1492,18 +1493,18 @@ iso_stream_schedule ( if (stream->highspeed) { if (itd_slot_ok(ehci, mod, start, stream->usecs, period)) - break; + done = 1; } else { if ((start % 8) >= 6) continue; if (sitd_slot_ok(ehci, mod, stream, start, sched, period)) - break; + done = 1; } - } while (start > next); + } while (start > next && !done); /* 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; -- 2.41.0