Re: [PATCH v10 05/16] s390/vfio-ap: implement in-use callback for vfio_ap driver

[Tony Krowiak <akrowiak@xxxxxxxxxxxxx>]

On 9/25/20 5:29 AM, Halil Pasic wrote:
> On Fri, 21 Aug 2020 15:56:05 -0400
> Tony Krowiak <akrowiak@xxxxxxxxxxxxx> wrote:
>
> > +
> > +bool vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm)
> > +{
> > +	bool in_use;
> > +
> > +	mutex_lock(&matrix_dev->lock);
> > +	in_use = !!vfio_ap_mdev_verify_no_sharing(NULL, apm, aqm);
> > +	mutex_unlock(&matrix_dev->lock);
> See also my comment for patch 4. AFAIU as soon as you release the lock
> the in_use may become outdated in any moment.

See my response to your comment for patch 4.

> > +
> > +	return in_use;
> > +}