Re: [PATCH 1/1] driver,usb: Fix a warning in uhci-hcd driver

From: Alan Stern
Date: Fri Apr 26 2013 - 12:51:38 EST

On Fri, 26 Apr 2013, ZhenHua wrote:

> There is a function wait_for_HP() in uhci-hub.c. In this
> patch, it is used in suspend_rh(), I think this can be a
> solution. And I have tested this patch, it can fix the bug.
> I think there is another patch needed. As Alan said in another
> mail, in the UHCI_RH_RUNNING_NODEVS case, it should not be stopped
> if the uhci device is HP iLo virtual usb.

I believe that if you change the UHCI_RH_RUNNING_NODEVS case, you will
find that this patch (calling wait_for_HP) isn't needed.

In fact, the patch is so easy that I am including it below. Please
test this (without either of your patches) to see if it works.

Alan Stern

Index: usb-3.9/drivers/usb/host/uhci-hub.c
--- usb-3.9.orig/drivers/usb/host/uhci-hub.c
+++ usb-3.9/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);

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