Re: [linux-usb-devel] 2.6.18-rc6-mm1 (-mm2): ohci resume problem

Alan Stern
2006-09-13T21:55:10Z

On Wed, 13 Sep 2006, Rafael J. Wysocki wrote:

> > Try this patch instead. It looks for problems occurring a little earlier
> > in the call chain.
>
> I've applied both patches at a time (I hope they don't conflict).
>
> The dmesg output is attached.

The dmesg output shows the root-hub device state is set wrong.

I have to leave now, so I can't give you another patch to try. You can
experiment as follows...

Look in drivers/usb/host/ehci-pci.c, at ehci_pci_resume(). The part of
interest is everything following the "restart:" statement label.

Try adding some ehci_dbg() lines in there (copy the form of the line just
after restart:). We want to follow the value of
hcd->self.root_hub->state. Initially it should be equal to
USB_STATE_SUSPENDED (= 8), and it shouldn't change. But somewhere it is
getting set to USB_STATE_CONFIGURED (= 7). I don't know where, but almost
certainly somewhere in this routine. If you can find out where that
happens, I'd appreciate it.

Alan Stern