Am Montag, den 01.07.2019, 10:17 -0400 schrieb Alan Stern:
> On Mon, 1 Jul 2019, Oliver Neukum wrote:
>
> > Am Donnerstag, den 27.06.2019, 09:52 -0400 schrieb Alan Stern:
> >
> > >
> > > Or maybe the WAIT_FOR_RESUME ioctl returns because there was a remote
> > > wakeup. In this case also you would call FORBID_SUSPEND.
> > >
> > > In fact, you should call FORBID_SUSPEND _whenever_ WAIT_FOR_RESUME
> >
> > Well, this kind of indicates that the original syscall should bump
> > the counter.
>
> Perhaps it does, but...
>
> > > returns, unless your program has decided not to use the device any more
> > > (in which case you don't care whether the device is suspended or
> > > resumed).
> >
> > Then you should close the device.
>
> Exactly. Suppose WAIT_FOR_RESUME is interrupted and then the program
> closes the device. There's no need to force the device back to full
> power in this situation.
But that is the error case. You return an error code. The point of that
is to report that a syscall did not have all requested effects.
Regards
Oliver
