linux-kernel - Re: [PATCH 10/15] vfio/fsl-mc: Use the new device life cycle helpers

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Message-ID: <Yw6pxrS1zb5JKt8q@ziepe.ca>
Date:   Tue, 30 Aug 2022 21:22:30 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Kevin Tian <kevin.tian@...el.com>
Cc:     Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Eric Farman <farman@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Tony Krowiak <akrowiak@...ux.ibm.com>,
        Jason Herne <jjherne@...ux.ibm.com>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Diana Craciun <diana.craciun@....nxp.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Longfang Liu <liulongfang@...wei.com>,
        Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
        Yishai Hadas <yishaih@...dia.com>,
        Eric Auger <eric.auger@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Abhishek Sahu <abhsahu@...dia.com>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, Yi Liu <yi.l.liu@...el.com>
Subject: Re: [PATCH 10/15] vfio/fsl-mc: Use the new device life cycle helpers

On Sun, Aug 28, 2022 at 01:10:32AM +0800, Kevin Tian wrote:
> From: Yi Liu <yi.l.liu@...el.com>
> 
> Export symbol of vfio_release_device_set() so fsl-mc @init can handle
> the error path cleanly instead of assuming certain vfio core API can
> help release device_set afterwards.

I think you should leave it as is, the "device_set" cleanup is just
something handled completely internally to vfio

If ops->init fails then we expect the core code to clean the
device_set, and it does because it calls vfio_init_device() already.

Having a single weirdly placed release in the driver is pretty
confusing, IMHO.

Jason