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On Wed, 9 Oct 2002 09:12, Oliver Neukum wrote:
> Hi,
>
> this code
> int usb_unlink_urb(struct urb *urb)
> {
> if (urb && urb->dev && urb->dev->bus && urb->dev->bus->op)
> return urb->dev->bus->op->unlink_urb(urb);
> else
> return -ENODEV;
> }
> from usb.c depend on gcc caching urb->dev.
> Is that a valid assumption? It would seem so, but gcc is beyond me.
What happens if it doesn't cache it?
If urb->dev (or urb->dev->bus) can become invalid at any time, then I can't
think of a safe construct to refer to urb->bus->dev->op. Aren't you always
going to have some (shrinking) window of race?
Brad
- --
http://linux.conf.au. 22-25Jan2003. Perth, Aust. I'm registered. Are you?
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