Re: [PATCH v1 07/18] vfio/ccw: Flatten MDEV device (un)register

Eric Farman
2022-06-03T20:38:56Z

On Thu, 2022-06-02 at 15:14 -0400, Matthew Rosato wrote:
> On 6/2/22 1:19 PM, Eric Farman wrote:
> > The vfio_ccw_mdev_(un)reg routines are merely vfio-ccw routines
> > that
> > pass control to mdev_(un)register_device. Since there's only one
> > caller of each, let's just call the mdev routines directly.
>
> I'd reword slightly to reference the ops extern
>
> ".. caller of each, externalize vfio_ccw_mdev_ops and call..."

Of course vfio_ccw_mdev_ops was removed in 5.19 via commit 6b42f491e17c
("vfio/mdev: Remove mdev_parent_ops"), so the extern doesn't happen
now.

>
> regardless,
>
> Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
>
> > Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> > Signed-off-by: Eric Farman <farman@linux.ibm.com>
> > ---
> > drivers/s390/cio/vfio_ccw_drv.c | 4 ++--
> > drivers/s390/cio/vfio_ccw_ops.c | 12 +-----------
> > drivers/s390/cio/vfio_ccw_private.h | 4 +---
> > 3 files changed, 4 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/s390/cio/vfio_ccw_drv.c
> > b/drivers/s390/cio/vfio_ccw_drv.c
> > index 9d817aa2f1c4..3784eb4cda85 100644
> > --- a/drivers/s390/cio/vfio_ccw_drv.c
> > +++ b/drivers/s390/cio/vfio_ccw_drv.c
> > @@ -239,7 +239,7 @@ static int vfio_ccw_sch_probe(struct subchannel
> > *sch)
> >
> > private->state = VFIO_CCW_STATE_STANDBY;
> >
> > - ret = vfio_ccw_mdev_reg(sch);
> > + ret = mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops);
> > if (ret)
> > goto out_disable;
> >
> > @@ -261,7 +261,7 @@ static void vfio_ccw_sch_remove(struct
> > subchannel *sch)
> > struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
> >
> > vfio_ccw_sch_quiesce(sch);
> > - vfio_ccw_mdev_unreg(sch);
> > + mdev_unregister_device(&sch->dev);
> >
> > dev_set_drvdata(&sch->dev, NULL);
> >
> > diff --git a/drivers/s390/cio/vfio_ccw_ops.c
> > b/drivers/s390/cio/vfio_ccw_ops.c
> > index 4a64c176facb..497e1b7ffd61 100644
> > --- a/drivers/s390/cio/vfio_ccw_ops.c
> > +++ b/drivers/s390/cio/vfio_ccw_ops.c
> > @@ -656,18 +656,8 @@ struct mdev_driver vfio_ccw_mdev_driver = {
> > .remove = vfio_ccw_mdev_remove,
> > };
> >
> > -static const struct mdev_parent_ops vfio_ccw_mdev_ops = {
> > +const struct mdev_parent_ops vfio_ccw_mdev_ops = {
> > .owner = THIS_MODULE,
> > .device_driver = &vfio_ccw_mdev_driver,
> > .supported_type_groups = mdev_type_groups,
> > };
> > -
> > -int vfio_ccw_mdev_reg(struct subchannel *sch)
> > -{
> > - return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops);
> > -}
> > -
> > -void vfio_ccw_mdev_unreg(struct subchannel *sch)
> > -{
> > - mdev_unregister_device(&sch->dev);
> > -}
> > diff --git a/drivers/s390/cio/vfio_ccw_private.h
> > b/drivers/s390/cio/vfio_ccw_private.h
> > index 5c128eec596b..2e0744ac6492 100644
> > --- a/drivers/s390/cio/vfio_ccw_private.h
> > +++ b/drivers/s390/cio/vfio_ccw_private.h
> > @@ -117,12 +117,10 @@ struct vfio_ccw_private {
> > struct work_struct crw_work;
> > } __aligned(8);
> >
> > -extern int vfio_ccw_mdev_reg(struct subchannel *sch);
> > -extern void vfio_ccw_mdev_unreg(struct subchannel *sch);
> > -
> > extern int vfio_ccw_sch_quiesce(struct subchannel *sch);
> >
> > extern struct mdev_driver vfio_ccw_mdev_driver;
> > +extern const struct mdev_parent_ops vfio_ccw_mdev_ops;
> >
> > /*
> > * States of the device statemachine.