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List:       linux-s390
Subject:    Re: [PATCH v10 05/16] s390/vfio-ap: implement in-use callback for vfio_ap driver
From:       Tony Krowiak <akrowiak () linux ! ibm ! com>
Date:       2020-09-29 14:00:01
Message-ID: b6810e67-1e50-d62c-8c9e-57429e8a239f () linux ! ibm ! com
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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 the in_use may become outdated in any moment.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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