linux-kernel - Re: USB autosuspend vs. URB submission

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Message-ID: <Pine.LNX.4.44L0.1301081047170.1535-100000@iolanthe.rowland.org>
Date:	Tue, 8 Jan 2013 10:51:20 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Josh Boyer <jwboyer@...hat.com>
cc:	gregkh@...uxfoundation.org, <laurent.pinchart@...asonboard.com>,
	<mdharm-usb@...-eyed-alien.net>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: USB autosuspend vs. URB submission

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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