netdev - Re: Active URB submitted twice in pegasus driver

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Date:	Tue, 26 Mar 2013 17:22:07 +0200 (EET)
From:	Petko Manolov <petkan@...leusys.com>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
cc:	Petko Manolov <petkan@...rs.sourceforge.net>,
	linux-usb@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
	netdev@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: Active URB submitted twice in pegasus driver

On Mon, 25 Mar 2013, Sarah Sharp wrote:

> Hi Petko,
>
> I'm testing a USB to ethernet adapter with Greg's usb-linus branch (based
> on 3.9-rc4).  I'm seeing an odd behavior, and I'm suspicious that a
> second behavior found by Stephen Hemminger may also be related:
>
> http://marc.info/?l=linux-usb&m=136364625519235&w=2
>
> When I load the pegasus driver for this adapter (without an ethernet
> cable hooked to it), and this is on a cold system boot or a complete
> unloading and reloading of the usbcore, I get the following warning:

Unfortunately the machine i ran my tests on does not have xHCI nor i used 
Greg's tree.  I did not observe this warning on both 3.8.4 and Linus' 
3.9-rc4.  It looks like to me that the issue is outside the driver code.

However, i am curious whether you experience the same problem with other 
(non-ADMtek based) usb-to-lan adapters which support xxx_set_multicast(). 
These calls are asynchronous by nature and should also trigger this 
warning.  Please let me know if this is not the case so i start digging 
into pegasus.c.

cheers,
Petko
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