| Date | Fri, 25 Sep 2020 11:29:41 +0200 | From | Halil Pasic <> | Subject | Re: [PATCH v10 05/16] s390/vfio-ap: implement in-use callback for vfio_ap driver |
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On Fri, 21 Aug 2020 15:56:05 -0400 Tony Krowiak <akrowiak@linux.ibm.com> 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 AFAIU as soon as you release the lock the in_use may become outdated in any moment.
> + > + return in_use; > +}
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