This is a note to let you know that I've just added the patch titled
USB: UHCI: accept very late isochronous URBs
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-uhci-accept-very-late-isochronous-urbs.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bef073b067a7b1874a6b381e0035bb0516d71a77 Mon Sep 17 00:00:00 2001
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 24 Sep 2013 15:47:20 -0400
Subject: USB: UHCI: accept very late isochronous URBs
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
commit bef073b067a7b1874a6b381e0035bb0516d71a77 upstream.
Commit 24f531371de1 (USB: EHCI: accept very late isochronous URBs)
changed the isochronous API provided by ehci-hcd. URBs submitted too
late, so that the time slots for all their packets have already
expired, are no longer rejected outright. Instead the submission is
accepted, and the URB completes normally with a -EXDEV error for each
packet. This is what client drivers expect.
This patch implements the same policy in uhci-hcd. It should be
applied to all kernels containing commit c44b225077bb (UHCI: implement
new semantics for URB_ISO_ASAP).
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/uhci-q.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -1303,7 +1303,7 @@ static int uhci_submit_isochronous(struc
}
/* Fell behind? */
- if (uhci_frame_before_eq(frame, next)) {
+ if (!uhci_frame_before_eq(next, frame)) {
/* USB_ISO_ASAP: Round up to the first available slot */
if (urb->transfer_flags & URB_ISO_ASAP)
@@ -1311,13 +1311,17 @@ static int uhci_submit_isochronous(struc
-qh->period;
/*
- * Not ASAP: Use the next slot in the stream. If
- * the entire URB falls before the threshold, fail.
+ * Not ASAP: Use the next slot in the stream,
+ * no matter what.
*/
else if (!uhci_frame_before_eq(next,
frame + (urb->number_of_packets - 1) *
qh->period))
- return -EXDEV;
+ dev_dbg(uhci_dev(uhci), "iso underrun %p (%u+%u < %u)\n",
+ urb, frame,
+ (urb->number_of_packets - 1) *
+ qh->period,
+ next);
}
}
Patches currently in stable-queue which might be from stern@xxxxxxxxxxxxxxxxxxx are
queue-3.11/usb-ohci-accept-very-late-isochronous-urbs.patch
queue-3.11/usb-fix-pm-config-symbol-in-uhci-hcd-ehci-hcd-and-xhci-hcd.patch
queue-3.11/usb-uhci-accept-very-late-isochronous-urbs.patch
queue-3.11/usb-core-devio.c-don-t-reject-control-message-to-endpoint-with-wrong-direction-bit.patch
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