On Wed, 11 Mar 2009, Brandon Philips wrote:
> On 15:46 Wed 11 Mar 2009, Alan Stern wrote:
> > On Wed, 11 Mar 2009, Brandon Philips wrote:
> > Okay, here's a diagnostic patch meant to apply on top of
> > gregkh-all-2.6.29-rc7. Let's see what it says...
>
> Here is the log:
> http://ifup.org/~philips/467317/pearl-alan-debug.log
>
> > default:
> > qh = (struct ehci_qh *) urb->hcpriv;
> > + if (alantest == 1) {
> > + alantest = 2;
> > + ehci_info(ehci, "dequeue: qh %p\n", qh);
> > + }
>
> This was the last thing printed before I dumped the task states with sysrq
> keys.
Okay, not much information there but it's a start. Here's a more
informative patch to try instead.
Alan Stern
Index: usb-2.6/drivers/usb/host/ehci-hcd.c
===================================================================
--- usb-2.6.orig/drivers/usb/host/ehci-hcd.c
+++ usb-2.6/drivers/usb/host/ehci-hcd.c
@@ -108,6 +108,8 @@ MODULE_PARM_DESC (ignore_oc, "ignore bog
#include "ehci.h"
#include "ehci-dbg.c"
+static int alantest;
+
/*-------------------------------------------------------------------------*/
static void
@@ -301,12 +303,19 @@ static void ehci_iaa_watchdog(unsigned l
unsigned long flags;
spin_lock_irqsave (&ehci->lock, flags);
+ if (alantest == 2)
+ alantest = 3;
/* Lost IAA irqs wedge things badly; seen first with a vt8235.
* So we need this watchdog, but must protect it against both
* (a) SMP races against real IAA firing and retriggering, and
* (b) clean HC shutdown, when IAA watchdog was pending.
*/
+ if (alantest == 3)
+ ehci_info(ehci, "IAA watchdog: reclaim %p pending %d state
%d\n",
+ ehci->reclaim,
+ timer_pending(&ehci->iaa_watchdog),
+ ehci_to_hcd(ehci)->state);
if (ehci->reclaim
&& !timer_pending(&ehci->iaa_watchdog)
&& HC_IS_RUNNING(ehci_to_hcd(ehci)->state)) {
@@ -337,9 +346,15 @@ static void ehci_iaa_watchdog(unsigned l
ehci_vdbg(ehci, "IAA watchdog: status %x cmd %x\n",
status, cmd);
+ if (alantest == 3)
+ ehci_info(ehci, "IAA watchdog: status %x cmd %x\n",
+ status, cmd);
+
end_unlink_async(ehci);
}
+ if (alantest == 3)
+ alantest = 0;
spin_unlock_irqrestore(&ehci->lock, flags);
}
@@ -729,6 +744,8 @@ static irqreturn_t ehci_irq (struct usb_
&ehci->regs->command);
ehci_dbg(ehci, "IAA with IAAD still set?\n");
}
+ if (alantest == 2)
+ ehci_info(ehci, "IAA: reclaim %p\n", ehci->reclaim);
if (ehci->reclaim) {
COUNT(ehci->stats.reclaim);
end_unlink_async(ehci);
@@ -847,12 +864,17 @@ static int ehci_urb_enqueue (
static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
{
/* failfast */
- if (!HC_IS_RUNNING(ehci_to_hcd(ehci)->state) && ehci->reclaim)
+ if (!HC_IS_RUNNING(ehci_to_hcd(ehci)->state) && ehci->reclaim) {
+ if (alantest == 2)
+ ehci_info(ehci, "call end_unlink_async\n");
end_unlink_async(ehci);
+ }
/* if it's not linked then there's nothing to do */
- if (qh->qh_state != QH_STATE_LINKED)
- ;
+ if (qh->qh_state != QH_STATE_LINKED) {
+ if (alantest == 2)
+ ehci_info(ehci, "not linked\n");
+ }
/* defer till later if busy */
else if (ehci->reclaim) {
@@ -864,10 +886,15 @@ static void unlink_async (struct ehci_hc
continue;
qh->qh_state = QH_STATE_UNLINK_WAIT;
last->reclaim = qh;
+ if (alantest == 2)
+ ehci_info(ehci, "unlink_async: add to reclaim\n");
/* start IAA cycle */
- } else
+ } else {
+ if (alantest == 2)
+ ehci_info(ehci, "call start_unlink_async\n");
start_unlink_async (ehci, qh);
+ }
}
/* remove from hardware lists
@@ -891,16 +918,28 @@ static int ehci_urb_dequeue(struct usb_h
// case PIPE_BULK:
default:
qh = (struct ehci_qh *) urb->hcpriv;
+ if (alantest == 1) {
+ alantest = 2;
+ ehci_info(ehci, "dequeue: qh %p state %d\n", qh,
+ qh->qh_state);
+ }
if (!qh)
break;
switch (qh->qh_state) {
case QH_STATE_LINKED:
case QH_STATE_COMPLETING:
+ if (alantest == 2)
+ ehci_info(ehci, "call unlink_async\n");
unlink_async(ehci, qh);
break;
case QH_STATE_UNLINK:
case QH_STATE_UNLINK_WAIT:
/* already started */
+ if (alantest == 2) {
+ alantest = 3;
+ ehci_info(ehci, "unlink already started,
pending %d\n",
+ timer_pending(&ehci->iaa_watchdog));
+ }
break;
case QH_STATE_IDLE:
WARN_ON(1);
Index: usb-2.6/drivers/usb/host/ehci-pci.c
===================================================================
--- usb-2.6.orig/drivers/usb/host/ehci-pci.c
+++ usb-2.6/drivers/usb/host/ehci-pci.c
@@ -314,6 +314,8 @@ static int ehci_pci_resume(struct usb_hc
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+ if (alantest == 0)
+ alantest = 1;
// maybe restore FLADJ
if (time_before(jiffies, ehci->next_statechange))
Index: usb-2.6/drivers/usb/host/ehci-q.c
===================================================================
--- usb-2.6.orig/drivers/usb/host/ehci-q.c
+++ usb-2.6/drivers/usb/host/ehci-q.c
@@ -453,6 +453,8 @@ halt:
/* reinit the xacterr counter for the next qtd */
qh->xacterrs = QH_XACTERR_MAX;
}
+ if (alantest == 3)
+ ehci_info(ehci, "qh_completions: qh %p last %p\n", qh, last);
/* last urb's completion might still need calling */
if (likely (last != NULL)) {
@@ -1062,7 +1064,13 @@ static void end_unlink_async (struct ehc
ehci->reclaim = next;
qh->reclaim = NULL;
+ if (alantest == 2) {
+ alantest = 3;
+ ehci_info(ehci, "end_unlink_async: qh %p\n", qh);
+ }
qh_completions (ehci, qh);
+ if (alantest == 3)
+ alantest = 0;
if (!list_empty (&qh->qtd_list)
&& HC_IS_RUNNING (ehci_to_hcd(ehci)->state))
@@ -1131,6 +1139,8 @@ static void start_unlink_async (struct e
/* if (unlikely (qh->reclaim != 0))
* this will recurse, probably not much
*/
+ if (alantest == 2)
+ ehci_info(ehci, "start_unlink_async: halted\n");
end_unlink_async (ehci);
return;
}
@@ -1139,6 +1149,8 @@ static void start_unlink_async (struct e
ehci_writel(ehci, cmd, &ehci->regs->command);
(void)ehci_readl(ehci, &ehci->regs->command);
iaa_watchdog_start(ehci);
+ if (alantest == 2)
+ ehci_info(ehci, "start_unlink_async: IAA started\n");
}
/*-------------------------------------------------------------------------*/
--
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