On Mon, 2015-11-30 at 12:14 -0500, Alan Stern wrote:
> > +static struct usb_memory *
> > +find_memory_area(struct usb_dev_state *ps, const struct
> usbdevfs_urb *uurb)
> > +{
> > + struct usb_memory *usbm = NULL, *iter;
> > + unsigned long flags;
> > + unsigned long uurb_start = (unsigned long)uurb->buffer;
> > +
> > + spin_lock_irqsave(&ps->lock, flags);
> > + list_for_each_entry(iter, &ps->memory_list, memlist) {
> > + if (iter->usb_use_count == 0 &&
>
> I don't think this is necessary. It should be legal to keep the data
> for two URBs in the same memory region, so long as they don't overlap.
Hi,
they also must not share cache lines. How do you guarantee that in this
case?
Regards
Oliver
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