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SubjectRe: [linux-usb-devel] Re: [Bluetooth] HCI USB driver update. Support for SCO over HCI USB.
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Am Dienstag, 29. April 2003 23:40 schrieb Greg KH:
> On Tue, Apr 29, 2003 at 11:34:19PM +0200, Oliver Neukum wrote:
> > > +int usb_init_urb(struct urb *urb)
> > > +{
> > > + if (!urb)
> > > + return -EINVAL;
> > > + memset(urb, 0, sizeof(*urb));
> > > + urb->count = (atomic_t)ATOMIC_INIT(1);
> > > + spin_lock_init(&urb->lock);
> > > +
> > > + return 0;
> > > +}
> >
> > Greg, please don't do it this way. Somebody will
> > try to free this urb. If the urb is part of a structure
> > this must not lead to a kfree. Please init it to some
> > insanely high dummy value in this case.
>
> We can't init it to a high value, if we want to use it ourself in
> usb_alloc_urb().

So don't or make that value a parameter.

> And yes, I agree this is a very dangerous function to use on your own,
> I thought I conveyed that in the documentation for the function.

It's not any more dangerous than what worked quite well for 2.4.

> But if we don't have such a function, then people like Max will just
> roll their own, like he just did :)
>
> Might as well make it easy for him to shoot himself in the foot if he
> really wants to...

Sure, why not.

Regards
Oliver

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