linux-kernel - Re: [PATCH 2/2] s390/vfio-ap: replace open coded locks for VFIO_GROUP_NOTIFY_SET

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Date:   Mon, 26 Jul 2021 19:03:17 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Halil Pasic <pasic@...ux.ibm.com>
Cc:     Tony Krowiak <akrowiak@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, borntraeger@...ibm.com,
        cohuck@...hat.com, pasic@...ux.vnet.ibm.com, jjherne@...ux.ibm.com,
        alex.williamson@...hat.com, kwankhede@...dia.com, david@...hat.com
Subject: Re: [PATCH 2/2] s390/vfio-ap: replace open coded locks for
 VFIO_GROUP_NOTIFY_SET_KVM notification

On Mon, Jul 26, 2021 at 10:36:28PM +0200, Halil Pasic wrote:

> You may end up with open and close running interleaved. What I'
> trying to say is, to my best knowledge, normally there is no
> you have to close it before you open it again rule for files.

This is an existing bug in this driver, I've fixed in the reflck series.

open_device/close_device will not run concurrently, or out of order,
afer it is fixed.

Jason