Re: [linux-usb-devel] Re: kernel crash during shutdown

[Bernd Porr]

Sorry. Was a bit in a hurry.



David Brownell wrote:
Bernd Porr wrote:

I've added some debug info into the ehci code:

When I shut down the kernel I get following function calls:

ehci_stop
ehci_work
timer_action_done
scan_async
scan_periodic

static void ehci_work (struct ehci_hcd *ehci, struct pt_regs *regs)
{
        printk("ehci_work\n");
        printk("timer_action_done\n");
        timer_action_done (ehci, TIMER_IO_WATCHDOG);
        if (ehci->reclaim_ready) {
                printk("end_unlink_async\n");
                end_unlink_async (ehci, regs);
        }
        printk("scan_async\n");
        scan_async (ehci, regs);
        if (ehci->next_uframe != -1) {
                printk("scan_periodic\n");
                scan_periodic(ehci, regs);
        }
        /* the IO watchdog guards against hardware or driver bugs that
         * misplace IRQs, and should let us run completely without IRQs.
         */
        if ((ehci->async->qh_next.ptr != 0) || (ehci->periodic_sched != 
0)) {
                printk("timer_action\n");
                timer_action (ehci, TIMER_IO_WATCHDOG);
        }
}

If you modify ehci_stop() to del_timer_sync()
only after ehci_reset() is called, does that make
things better?
I'll try.

[ Note I've updated the Subject: to stop implying this
is related to the recent patch, since you also said
it happened without that patch ... ]
ok. I'll keep it.
- Dave
/Bernd



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