linux-kernel - Re: usb_fill_bulk_urb() broken for USB1.1?

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Message-ID: <46815269.8060507@redhat.com>
Date:	Tue, 26 Jun 2007 13:52:41 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Keith Chew <keith.chew@...il.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: usb_fill_bulk_urb() broken for USB1.1?

On 06/26/2007 10:20 AM, Keith Chew wrote:

[cc: linux-usb-devel]

> We have been using a Zydas based WIFI drivers under kernel 2.6.16.18
> with great success. Recently, when we upgraded to 2.6.20.1 (also
> tested on 2.6.21.5), we found that during initialisation, these calls
> works with USB2.0 but stopped working on USB1.1:
> 
> usb_fill_bulk_urb();
> usb_submit_urb();
> 
> The error code returned is -22 (-EINVAL). In 2.6.16.18, it works for
> both USB2.0 and 1.1.
> 
> When we change to use usb_fill_int_urb(), it then works for USB1.1,
> but takes up to 15 seconds (usually less than 5 seconds) for the
> driver to initialise. Also, usb_fill_int_urb() does not work for
> USB2.0 (kernel panic).
> 
> Can anyone point us to the right direction on how to get
> usb_fill_bulk_urb() working on USB1.1? We need this as not all of the
> deployed machines have USB2.0 enabled.
> 
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