This is a note to let you know that I've just added the patch titled
USB: UHCI: fix for suspend of virtual HP controller
to the 3.9-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-fix-for-suspend-of-virtual-hp-controller.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 997ff893603c6455da4c5e26ba1d0f81adfecdfc Mon Sep 17 00:00:00 2001
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 14 May 2013 13:55:29 -0400
Subject: USB: UHCI: fix for suspend of virtual HP controller
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
commit 997ff893603c6455da4c5e26ba1d0f81adfecdfc upstream.
HP's virtual UHCI host controller takes a long time to suspend
(several hundred microseconds), even when no devices are attached.
This provokes a warning message from uhci-hcd in the auto-stop case.
To prevent this from happening, this patch adds a test to avoid
performing an auto-stop when the wait_for_hp quirk flag is set. The
controller will still suspend through the normal runtime PM mechanism.
And since that pathway includes a 1-ms delay, the slowness of the
virtual hardware won't matter.
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Reported-and-tested-by: ZhenHua <zhen-hual@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/uhci-hub.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/usb/host/uhci-hub.c
+++ b/drivers/usb/host/uhci-hub.c
@@ -225,7 +225,8 @@ static int uhci_hub_status_data(struct u
/* auto-stop if nothing connected for 1 second */
if (any_ports_active(uhci))
uhci->rh_state = UHCI_RH_RUNNING;
- else if (time_after_eq(jiffies, uhci->auto_stop_time))
+ else if (time_after_eq(jiffies, uhci->auto_stop_time) &&
+ !uhci->wait_for_hp)
suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
break;
Patches currently in stable-queue which might be from stern@xxxxxxxxxxxxxxxxxxx are
queue-3.9/usb-uhci-fix-for-suspend-of-virtual-hp-controller.patch
queue-3.9/usb-ohci-fix-logic-for-scheduling-isochronous-urbs.patch
queue-3.9/usb-xhci-override-bogus-bulk-wmaxpacketsize-values.patch
queue-3.9/usb-fix-latency-in-uhci-hcd-and-ohci-hcd.patch
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