hi all:

2010/11/22 Alan Stern <stern@rowland.harvard.edu>:
quoted text
> On Mon, 22 Nov 2010, vichy wrote:
>
>> > Did you monitor the bus while running a test with a 10-second timeout?
>> > Maybe comparing the results of the two tests will explain why the
>> > timeout occurs.
>> I found there is debugfs I can use to monitor each urb transaction.
>
> You should be more careful about the words you use.  The usbmon
> interface in debugfs monitors URBs.  It does not monitor USB
> transactions.
>
>> But I have one question?
>> how could I combine output of dmesg and debugfs together?
>> There is an timeout error message in usb driver and I want to combine
>> dmesg together with urb traffic such that I can find out the urb of
>> timeout happened.
>
> Make sure you have CONFIG_PRINTK_TIME enabled so that you get
> high-resolution timestamps in the dmesg log.  Although these timestamps
> are not the same as the values used in usbmon, the difference between
> them remains fixed.  Therefore you can match up events between the two
> logs.
>
> But you don't need a detailed comparison to find out which URB timed
> out.  You can tell by looking at the status code in the URB's
> completion line; a timeout will set the status to -2.

I can see -2 on the log of usbmon right now.
And it seems from usbmon_urb_complete
but if the timeout happen, which function call usbmon_urb_complete?

appreciate your kind help :)
vichy
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