On Mon, Nov 26, 2012 at 11:51:39AM -0500, Alan Stern wrote:
> On Thu, 22 Nov 2012, Piergiorgio Sartor wrote:
>
> > OK, I got a log with working and then non working system,
> > so there should be a transition,
>
> The trace attached to Kernel Bugzilla #50381 didn't give any details.
> All it showed was that at one point the computer stopped getting data
> from the drives.
>
> Does the same problem occur if you use fewer drives or only one hub?
>
> Below is a diagnostic patch which should add extra information to the
> dmesg log when the problem occurs. It requires CONFIG_USB_DEBUG to be
> set. Let's see what it shows.
>
Hi Alan,
thanks for the patch.
I'll try to apply it and report the results,
including the USB EHCI register files.
Unfortunately, I cannot provide a "deadline"
(so to speak), I'm quite busy at the moment.
Thanks again,
bye,
pg
>
>
>
> Index: usb-3.7/drivers/usb/host/ehci-hcd.c
> ===================================================================
> --- usb-3.7.orig/drivers/usb/host/ehci-hcd.c
> +++ usb-3.7/drivers/usb/host/ehci-hcd.c
> @@ -907,6 +907,18 @@ static int ehci_urb_dequeue(struct usb_h
> qh = (struct ehci_qh *) urb->hcpriv;
> if (!qh)
> break;
> +
> + if (usb_pipetype(urb->pipe) == PIPE_BULK) {
> + char label[40];
> +
> + sprintf(label, "dev %d ep %x state %d",
> + usb_pipedevice(urb->pipe),
> + usb_pipein(urb->pipe) +
> + usb_pipeendpoint(urb->pipe),
> + qh->qh_state);
> + dbg_qh(label, ehci, qh);
> + }
> +
> switch (qh->qh_state) {
> case QH_STATE_LINKED:
> case QH_STATE_COMPLETING:
--
piergiorgio
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