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

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Message-ID: <BN9PR11MB5276D146255D42CC00E1AD048C789@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Wed, 31 Aug 2022 06:14:11 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
CC:     Zhenyu Wang <zhenyuw@...ux.intel.com>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        "Joonas Lahtinen" <joonas.lahtinen@...ux.intel.com>,
        "Vivi, Rodrigo" <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>,
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        "Liu, Yi L" <yi.l.liu@...el.com>
Subject: RE: [PATCH 10/15] vfio/fsl-mc: Use the new device life cycle helpers

> From: Jason Gunthorpe <jgg@...pe.ca>
> Sent: Wednesday, August 31, 2022 8:23 AM
> 
> 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.
> 

I considered both. In the end I chose the current way being it's
clearer if just looking at @init. But yes having a release called
by driver is also confusing. Probably having a pair of assign/deassign
helpers is more clearer, but I'll not continue this path for unnecessary
complexity.

So I'll leave it as is and add a comment to clarify it.