On Sun, 16 May 2004, Greg KH wrote:

> On Sun, May 16, 2004 at 12:01:03PM -0400, Alan Stern wrote:
> > While looking through the irda-usb driver, I found that it does several
> > questionable things.
> > 
> >     irda_urb_net_timeout() looks at urb->status while the URB is
> >     still in progress.
> > 
> >     Even worse, it changes urb->status!
> 
> Ick ick ick.  That's wrong and needs to be fixed.

I'm not touching that; I don't know the first thing about the driver.  
There are no dates later than 2001 in the source, which makes me wonder if 
driver is actively maintained?

> >     The driver uses the urb->timeout field.  This field is supported
> >     only by the UHCI driver, and I would like to remove that support.
> 
> You mean the ohci and ehci drivers do not support that?  Since when?  We
> need to update the documentation if that is true...

As far as I know, since always.  (The hc_simple driver seems to support it 
though; I tend to forget about those oddball drivers...)  There _is_ a
comment in irda-usb.c mentioning that the timeouts work only with UHCI -- 
it looks like it's been in there for quite some time.

> > Right now there are only about 3 drivers that use urb->timeout.  My
> > feeling is that we should either remove timeout support entirely or else
> > move it to usbcore, where it will work with every HCD.  This wouldn't be
> > such a bad thing to do; in fact we could simply take the code already used
> > by usb_bulk/control_message() and put it in a more central location.  (If 
> > it were available in this way, usb-storage could be simplified.)
> 
> Move it to the core so that it actually works would be good.

That's a project for the future.  Unless someone else would like to do it 
first, I'll look at that when I remove timeouts from the UHCI driver.

Alan Stern



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