Andy Shevchenko wrote:
> On Tue, Jun 25, 2013 at 7:22 PM, Mika Westerberg
> <mika.westerberg@xxxxxxxxxxxxxxx> wrote:
>
> > The new function stops and removes the device if it doesn't respond.
> > If the device responds and it's a bus we apply the function to all
> > subdevices recursively.
> >
> > It's useful for hotplug bus check case, when you need drop all unplugged
> > devices before looking for new ones.
>
> One comment below.
>
> > +void pci_trim_stale_devices(struct pci_dev *dev)
> > +{
> > + struct pci_bus *bus = dev->subordinate;
> > + struct pci_dev *child, *tmp;
> > + bool alive;
> > + u32 l;
> > +
> > + /* check if the device responds */
> > + alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &l, 0);
> > + if (!alive)
> > + pci_stop_and_remove_bus_device(dev);
> > +
> > + if (alive && bus)
> > + list_for_each_entry_safe(child, tmp, &bus->devices, bus_list)
> > + pci_trim_stale_devices(child);
>
> It's not a tail call anyway, so, what about
>
> if (!pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &l, 0)) {
> pci_stop_and_remove_bus_device(dev);
> } else if (bus) {
> list_for_each_entry_safe(child, tmp, &bus->devices, bus_list)
> pci_trim_stale_devices(child);
> }
Why? It looks uglier.
--
Kirill A. Shutemov
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