On Thu, 13 Jun 2013, Viresh Kumar wrote:
> > + bool do_wakeup = device_may_wakeup(&pdev->dev);
> > + int ret;
> > +
> > + ret = ohci_suspend(hcd, do_wakeup);
> > + if (ret == 0 && do_wakeup && HCD_WAKEUP_PENDING(hcd)) {
>
> maybe s/ret == 0/!ret
I tend to prefer using ! for boolean values and == 0 for numeric
values. Just a matter of personal taste.
> I thought ret == 0 is the success case and not error case.
>
> > + ohci_resume(hcd, false);
> > + ret = -EBUSY;
> > + }
Yes, 0 is the success case. You must not have seen the explanation for
this code; it is needed to handle a race. If the suspend succeeds but
a wakeup request has already arrived, we need to undo the suspend.
Obviously, if the suspend failed then there's no need to undo anything.
Alan Stern
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