linux-kernel - RE: [PATCH v1 4/7] vfio/ccw: move private to mdev lifecycle

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Date:   Tue, 1 Nov 2022 09:08:14 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Eric Farman <farman@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>
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@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        "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>,
        Eric Auger <eric.auger@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Abhishek Sahu <abhsahu@...dia.com>,
        Yishai Hadas <yishaih@...dia.com>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: RE: [PATCH v1 4/7] vfio/ccw: move private to mdev lifecycle

> From: Eric Farman <farman@...ux.ibm.com>
> Sent: Thursday, October 20, 2022 12:22 AM
> 
> @@ -101,15 +101,20 @@ 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;

Not familiar with ccw but just want to double confirm this removal
is intentional w/o side-effect?

> +	private = vfio_ccw_alloc_private(sch);
> +	if (!private)
> +		return -ENOMEM;
> 
>  	ret = vfio_init_device(&private->vdev, &mdev->dev,
> &vfio_ccw_dev_ops);
> -	if (ret)
> +	if (ret) {
> +		kfree(private);
>  		return ret;
> +	}
> +
> +	dev_set_drvdata(&parent->dev, private);
> 
>  	VFIO_CCW_MSG_EVENT(2, "sch %x.%x.%04x: create\n",
>  			   sch->schid.cssid,
> @@ -123,6 +128,7 @@ static int vfio_ccw_mdev_probe(struct mdev_device
> *mdev)
>  	return 0;
> 
>  err_put_vdev:
> +	dev_set_drvdata(&parent->dev, NULL);

No need to set drvdata to NULL, iiuc