Re: usb_fill_bulk_urb() broken for USB1.1?

[Chuck Ebbert <cebbert@redhat.com>]

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.
>