On Thu, Mar 12, 2020 at 09:24:59AM +0100, Sascha Hauer wrote:
> On Thu, Mar 12, 2020 at 12:51:54AM +0100, Daniel Glöckner wrote:
> > Hello Sascha,
> >
> > On Wed, Mar 11, 2020 at 03:27:46PM +0100, Sascha Hauer wrote:
> > > +/**
> > > + * slice_acquired: test if a slice is acquired
> > > + * @slice: The slice to test
> > > + *
> > > + * This tests if a slice is acquired. Returns true if it is, false otherwise
> > > + */
> > > +bool slice_acquired(struct slice *slice)
> > > +{
> > > + struct slice_entry *se;
> > > + int acquired = slice->acquired;
> > > + bool ret = false;
> > > +
> > > + if (acquired > 0)
> > > + return true;
> > > +
> > > + if (acquired < 0) {
> > > + pr_err("Recursive dependency detected in slice %s\n",
> > > + slice_name(slice));
> > > + panic("Cannot continue");
> > > + }
> > > +
> > > + slice->acquired = -1;
> > > +
> > > + list_for_each_entry(se, &slice->deps, list)
> > > + if (slice_acquired(se->slice)) {
> > > + ret = true;
> > > + break;
> > > + }
> > > +
> > > + slice->acquired = acquired;
> >
> > no need to restore slice->acquire from acquired since
> > acquired must have been zero if we reach this line.
>
> Hm, no. Nothing changes slice->acquired in this function besides
> ourselves. It is still -1 how we have set it previously.
What I wanted to say is that you can simply use
slice->acquired = 0;
at the end.
Best regards,
Daniel
--
Dipl.-Math. Daniel Glöckner, emlix GmbH, http://www.emlix.com
Fon +49 551 30664-0, Fax +49 551 30664-11,
Gothaer Platz 3, 37083 Göttingen, Germany
Sitz der Gesellschaft: Göttingen, Amtsgericht Göttingen HR B 3160
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