On Tue, 30 Mar 2010, Alan Stern wrote:
On Tue, 30 Mar 2010, Justin Piszcz wrote:
Also, I'd like to see the contents of your /proc/interrupts. It looks
like the OHCI controller shares an IRQ line with some other device.
Hi, you are correct:
$ cat /proc/interrupts
CPU0 CPU1
0: 127 32 IO-APIC-edge timer
1: 0 2 IO-APIC-edge i8042
7: 1 0 IO-APIC-edge
9: 0 0 IO-APIC-fasteoi acpi
20: 0 3 IO-APIC-fasteoi ehci_hcd:usb1
22: 0 0 IO-APIC-fasteoi sata_nv
23: 216 134543 IO-APIC-fasteoi sata_nv, ohci_hcd:usb2
27: 0 68 PCI-MSI-edge hda_intel
28: 4722 1583395 PCI-MSI-edge eth0
NMI: 0 0 Non-maskable interrupts
LOC: 5414110 5415173 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 0 0 Performance monitoring interrupts
PND: 0 0 Performance pending work
RES: 766744 123073 Rescheduling interrupts
CAL: 113 25 Function call interrupts
TLB: 1014 1029 TLB shootdowns
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 19 19 Machine check polls
ERR: 1
MIS: 0
$
Well, I'm making progress. Below is a new debugging patch to try in
place of the first one. This time the dmesg log alone will be
sufficient, no need for a usbmon trace. And the output should be a lot
smaller, since the new patch doesn't print something every time an
interrupt occurs, but rather only when you unplug the mouse.
In fact, you might try unplugging the mouse while it still works and
then plugging it back in. The difference between the debugging
messages while everything is working and the same thing after the mouse
fails should be informative.
Ok, I can try this as well.
(By the way, these tests are meant to find out why your Xorg and khubd
processes hang when the mouse fails, not for finding the original cause
behind the mouse failure. That can be addressed later.)
This appears to occur only AFTER the mouse locks up, I do ctrl-alt-f1
and then X freezes up after that.
Some of those reports indicate that a BIOS update could fix the
problem. Have you checked your BIOS version?
The BIOS is outdated, I will create a Windows Boot CD and flash the BIOS
to the latest version. The hardware in question is an Optiplex 740. It is
running an older firmware version.. The latest firmware is from late 2009
(2.2.4): O740-224.EXE, but you cannot flash it in Linux so will test this
tomorrow, flash the latest bios, apply your latest patch, see if it recurs.
I did check the DIFF's for the Dell BIOS updates, none mention a USB problem
like the one in the kernel bug post (earlier Dell system).
Justin.
Alan Stern
Index: usb-2.6/drivers/usb/host/ohci-hcd.c
===================================================================
--- usb-2.6.orig/drivers/usb/host/ohci-hcd.c
+++ usb-2.6/drivers/usb/host/ohci-hcd.c
@@ -292,6 +292,8 @@ static int ohci_urb_dequeue(struct usb_h
if (urb_priv) {
if (urb_priv->ed->state == ED_OPER)
start_ed_unlink (ohci, urb_priv->ed);
+ ohci_info(ohci, "start unlink urb %p, ed %p tick %u\n",
+ urb, urb_priv->ed, urb_priv->ed->tick);
}
} else {
/*
@@ -324,6 +326,9 @@ ohci_endpoint_disable (struct usb_hcd *h
if (!ed)
return;
+ ohci_info(ohci, "disable ed %p (#%02x) state %d%s\n",
+ ed, ep->desc.bEndpointAddress, ed->state,
+ list_empty(&ed->td_list) ? "" : " (has tds)");
rescan:
spin_lock_irqsave (&ohci->lock, flags);
Index: usb-2.6/drivers/usb/host/ohci-q.c
===================================================================
--- usb-2.6.orig/drivers/usb/host/ohci-q.c
+++ usb-2.6/drivers/usb/host/ohci-q.c
@@ -912,6 +912,9 @@ rescan_all:
* frame counter wraps and EDs with partially retired TDs
*/
if (likely (HC_IS_RUNNING(ohci_to_hcd(ohci)->state))) {
+ ohci_info(ohci, "finish_unlinks: tick %u, ed %p %u, %d\n",
+ tick, ed, ed->tick,
+ tick_before(tick, ed->tick));
if (tick_before (tick, ed->tick)) {
skip_ed:
last = &ed->ed_next;
@@ -928,6 +931,8 @@ skip_ed:
TD_MASK;
/* INTR_WDH may need to clean up first */
+ ohci_info(ohci, "dma %llx head %x\n",
+ (unsigned long long) td->td_dma, head);
if (td->td_dma != head) {
if (ed == ohci->ed_to_check)
ohci->ed_to_check = NULL;
@@ -990,6 +995,8 @@ rescan_this:
/* HC may have partly processed this TD */
td_done (ohci, urb, td);
urb_priv->td_cnt++;
+ ohci_info(ohci, "td_cnt %d length %d\n",
+ urb_priv->td_cnt, urb_priv->length);
/* if URB is done, clean up */
if (urb_priv->td_cnt == urb_priv->length) {
--
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