On Tue, Jul 28, 2009 at 8:57 PM, Alan Stern<stern@xxxxxxxxxxxxxxxxxxx> wrote:
> On Tue, 28 Jul 2009, Manuel Lauss wrote:
>
>> > Did you disable only the I/O watchdog, or did you also disable the IAA
>> > watchdog?
>>
>> I/O Watchdog. With this:
>> diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
>> index 7d03549..047b7c0 100644
>> --- a/drivers/usb/host/ehci-hcd.c
>> +++ b/drivers/usb/host/ehci-hcd.c
>> @@ -140,7 +139,9 @@ timer_action(struct ehci_hcd *ehci, enum
>> ehci_timer_action action)
>> t = DIV_ROUND_UP(EHCI_SHRINK_FRAMES * HZ, 1000) + 1;
>> break;
>> }
>> +#ifndef CONFIG_USB_EHCI_NO_IO_WATCHDOG
>> mod_timer(&ehci->watchdog, t + jiffies);
>> +#endif
>> }
>> }
>
> Ooh, that doesn't disable just the I/O watchdog! It also disables the
> Async-Off and Async-Shrink watchdogs (they share the same timer).
Okay, I changed this to return immediately in "case TIMER_IO_WATCHDOG:"
I did the test as you asked, but disconnecting the device proved a bit
difficult since it doesn't have a physical connector (it's soldered on).
The "async" debug file is empty in all cases: after detection of the device,
after closing minicom, even after disconnecting it from the bus; removing
ehci-hcd still produces the dma pool busy messages.
khubd is waiting for something at drivers/usb/core/hub.c:3273
Thanks!
Manuel Lauss
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