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Date:   Thu, 3 Nov 2022 19:22:11 -0400
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Subject: Re: [PATCH v2 4/7] vfio/ccw: move private to mdev lifecycle
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To:     Eric Farman <farman@linux.ibm.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        Cornelia Huck <cohuck@redhat.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Kevin Tian <kevin.tian@intel.com>, Yi Liu <yi.l.liu@intel.com>
Cc:     Zhenyu Wang <zhenyuw@linux.intel.com>,
        Zhi Wang <zhi.a.wang@intel.com>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Halil Pasic <pasic@linux.ibm.com>,
        Vineeth Vijayan <vneethv@linux.ibm.com>,
        Peter Oberparleiter <oberpar@linux.ibm.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        Christian Borntraeger <borntraeger@linux.ibm.com>,
        Sven Schnelle <svens@linux.ibm.com>,
        Tony Krowiak <akrowiak@linux.ibm.com>,
        Jason Herne <jjherne@linux.ibm.com>,
        Harald Freudenberger <freude@linux.ibm.com>,
        Diana Craciun <diana.craciun@oss.nxp.com>,
        Eric Auger <eric.auger@redhat.com>,
        Kirti Wankhede <kwankhede@nvidia.com>,
        Abhishek Sahu <abhsahu@nvidia.com>,
        Yishai Hadas <yishaih@nvidia.com>,
        intel-gvt-dev@lists.freedesktop.org,
        intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
        kvm@vger.kernel.org
References: <20221102150152.2521475-1-farman@linux.ibm.com>
 <20221102150152.2521475-5-farman@linux.ibm.com>
From:   Matthew Rosato <mjrosato@linux.ibm.com>
In-Reply-To: <20221102150152.2521475-5-farman@linux.ibm.com>
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On 11/2/22 11:01 AM, Eric Farman wrote:
> Now that the mdev parent data is split out into its own struct,
> it is safe to move the remaining private data to follow the
> mdev probe/remove lifecycle. The mdev parent data will remain
> where it is, and follow the subchannel and the css driver
> interfaces.
> 
> Signed-off-by: Eric Farman <farman@linux.ibm.com>
> ---
>  drivers/s390/cio/vfio_ccw_drv.c     | 15 +--------------
>  drivers/s390/cio/vfio_ccw_ops.c     | 26 +++++++++++++-------------
>  drivers/s390/cio/vfio_ccw_private.h |  2 ++
>  3 files changed, 16 insertions(+), 27 deletions(-)
> 

...

> diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
> index eb0b8cc210bb..e45d4acb109b 100644
> --- a/drivers/s390/cio/vfio_ccw_ops.c
> +++ b/drivers/s390/cio/vfio_ccw_ops.c
> @@ -100,15 +100,20 @@ static int vfio_ccw_mdev_probe(struct mdev_device *mdev)
>  {
>  	struct subchannel *sch = to_subchannel(mdev->dev.parent);
>  	struct vfio_ccw_parent *parent = dev_get_drvdata(&sch->dev);
> -	struct vfio_ccw_private *private = dev_get_drvdata(&parent->dev);
> +	struct vfio_ccw_private *private;
>  	int ret;
>  
> -	if (private->state == VFIO_CCW_STATE_NOT_OPER)
> -		return -ENODEV;
> +	private = kzalloc(sizeof(*private), GFP_KERNEL);
> +	if (!private)
> +		return -ENOMEM;

Ha, looks like you time traveled and took my advice :)

In fact it looks like some of my other comments from patch 1 get cleaned up here too -- but would still be good to make those changes in patch 1 for completeness/bisect.

Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>