Messages in this thread | | | Subject | Re: [PATCH v10 05/16] s390/vfio-ap: implement in-use callback for vfio_ap driver | From | Tony Krowiak <> | Date | Tue, 29 Sep 2020 10:00:01 -0400 |
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On 9/25/20 5:29 AM, Halil Pasic wrote: > 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 the in_use may become outdated in any moment.
See my response to your comment for patch 4.
> >> + >> + return in_use; >> +}
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