Re: USB autosuspend vs. URB submission

[Alan Stern]

On Mon, 7 Jan 2013, Josh Boyer wrote:

> Hi,
> 
> We've had a few reports in Fedora of users hitting the WARN_ONCE in
> drivers/usb/core/urb.c that prints a warning about a usb_submit_urb
> being called on an active URB.  One of them[1] is from the ums_realtek
> driver and the other[2] is from the uvcvideo driver.  However, I noticed
> that in both instances it seems the devices were coming back from what I
> think is autosuspend.
> 
> I didn't immediately find any similar reports, and to my rather
> inexperienced eyes the drivers didn't seem to be doing anything clearly
> wrong.  I'm wondering if anyone has some possible ideas for debugging
> and whether or not this might be a general issue?

I don't see anything wrong either.

Can you ask the users to collect a usbmon trace covering the period 
when the problem occurs?

Alan Stern

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