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USB: UHCI: fix for suspend of virtual HP controller 

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@rowland.harvard.edu>
Reported-and-tested-by: ZhenHua <zhen-hual@hp.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2013-05-14 13:55:29 -04:00 committed by Greg Kroah-Hartman
parent ccd9509a0b
commit 997ff89360
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/host/uhci-hub.c
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@ -225,7 +225,8 @@ static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
/* 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;