On Thu, 1 Feb 2007, Florin Iucha wrote:

> > > I have read the Intel 82801E manual (this is the chipset that I am
> > > using) and the USB 2.0 spec (section 8.5.4 in particular, in contrast
> > > to 8.5.2) but I did not find a hard reference to this limitation of a
> > > single data packet per interrupt transfer.  Do you have a hard
> > > reference to this limitation and can you send me a link or a
> > > document/section number?
> > 
> > It isn't a hardware limitation; it's a software driver limitation.  So you
> > won't find it in any hardware manuals.
> 
> Does that mean that I can just remove the check and everything should
> work?

No.  I mean that the 2.6 driver is written in such a way that the check 
isn't needed -- but I don't know if the same is true for the 2.4 driver.
You can try it and see.

>  Do you know if there is anything that assumes the check
> upstream and might break if removed?

You mean, code that relies on getting an error from usb_uhci?  I don't 
think people write drivers like that.  They prefer to avoid errors.

Alan Stern


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