Re: [RFC] USB device persistence across suspend-to-disk

Alan Stern
2006-09-05T16:59:39Z

On Tue, 5 Sep 2006, Randy.Dunlap wrote:

> > +Setting the "persist=y" module parameter for usbcore will cause the
>
> persist=1 ??

Either will work.

> > +kernel to work around these issues. If usbcore is build into the
>
> s/build/built/

Got it, thanks.

> > +main kernel instead of as a separate module, you can put
> > +"usbcore.persist=1" on the boot command line. You can also change the
> > +kernel's behavior on the fly using sysfs: Type
> > +
> > + echo y >/sys/module/usbcore/parameters/persist
>
> Does sysfs treat 'y' as '1'?
> Anyway, it would be Good to be consistent.

Yes; I'll change everything to 'y'.

> > +structure. In effect, the kernel treats the device as though it had
> > +merely been reset instead of unplugged.
>
> so does the USB device also retain its same USB address?

It does. It didn't seem worthwhile to mention that point, however.

> > - dev->have_langid = -1;
> > + dev->have_langid = 1;

> Different patch (?).

When this is submitted for inclusion, that change will be broken out into
a separate patch.

Alan Stern