From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Thu, 16 Oct 2014 10:09:40 -0400 (EDT)
From: Alan Stern <stern@rowland.harvard.edu>
To: Naveen Kumar Parna <pnaveenkos@gmail.com>
cc: Oliver Neukum <oneukum@suse.de>,
	"linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>,
	<linux-usb@vger.kernel.org>, <acho@suse.com>
Subject: Re: btusb_intr_complete returns -EPIPE
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On Thu, 16 Oct 2014, Naveen Kumar Parna wrote:

> > Indeed. However, it is possible to use an additional in between your
> > devices and the internal hub.
> >
> >         Regards
> >                 Oliver
> >
> >
> 
> 
> Tested with this configuration(external hubs Dev 3, Dev 4, Dev 17, Dev
> 10) and got the same result.
> 
> /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
> 
> /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
> 
>     |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M
> 
>         |__ Port 5: Dev 3, If 0, Class=hub, Driver=hub/7p, 12M
> 
>             |__ Port 1: Dev 4, If 0, Class=hub, Driver=hub/7p, 12M

This is not what Oliver meant.  You have to use a USB-2 hub.  And 
having one of them is enough; you don't need two.

Alan Stern