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

[Tony Krowiak]

On 9/25/20 5:29 AM, Halil Pasic wrote:

On Fri, 21 Aug 2020 15:56:05 -0400
Tony Krowiak <akrow...@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the in_use may become outdated in any moment.

See my response to your comment for patch 4.

+
+       return in_use;
+}