linux-kernel - Re: [linux-usb-devel] usb_fill_bulk

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Message-ID: <20070627071128.GA26853@kroah.com>
Date:	Wed, 27 Jun 2007 00:11:28 -0700
From:	Greg KH <greg@...ah.com>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	Keith Chew <keith.chew@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] usb_fill_bulk_urb() broken for USB1.1?

On Tue, Jun 26, 2007 at 01:52:41PM -0400, Chuck Ebbert wrote:
> 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.

Do you have a pointer to where this code is so that we can see if the
driver is doing something "odd"?

thanks,

greg k-h
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