Re: [RFC] Moving from pipes to usb_host_endpoint pointers

Am Mittwoch 18 Juli 2007 schrieb Alan Stern:
> On Wed, 18 Jul 2007, Oliver Neukum wrote:
> 
> > > Am Mittwoch 18 Juli 2007 schrieb Alan Stern:
> > >  int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
> > >  {
> > > -       int                     pipe, temp, max;
> > > -       struct usb_device       *dev;
> > > -       int                     is_out;
> > > +       int                             xfertype, max;
> > > +       struct usb_device               *dev;
> > > +       struct usb_host_endpoint        *ep;
> > > +       int                             is_out;
> > 
> > This is a bit odd. Using a pointer the direction info should be included.
> 
> I don't understand.  Included where?

struct usb_host_endpoint

> > Or you could use endpoint numbers, which would remove some issues
> > with enummeration.
> 
> That's essentially the same as using a pipe, since some of the bits in 
> a pipe _are_ the endpoint number.

Only some, but yes, it is much closer. Still if you give ep, dev and is_out
should be implicit. And how do you submit the first URBs? Are you going
to fake a struct usb_host_endpoint for endpoint 0 ?

	Regards
		Oliver
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