[PATCH 18/18] vfio/mdev: Correct the function signatures for the mdev_type_attributes

[Cornelia Huck]

On Tue, 23 Mar 2021 14:55:35 -0300
Jason Gunthorpe <jgg at nvidia.com> wrote:

> The driver core standard is to pass in the properly typed object, the
> properly typed attribute and the buffer data. It stems from the root
> kobject method:
> 
>   ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,..)
> 
> Each subclass of kobject should provide their own function with the same
> signature but more specific types, eg struct device uses:
> 
>   ssize_t (*show)(struct device *dev, struct device_attribute *attr,..)
> 
> In this case the existing signature is:
> 
>   ssize_t (*show)(struct kobject *kobj, struct device *dev,..)
> 
> Where kobj is a 'struct mdev_type *' and dev is 'mdev_type->parent->dev'.
> 
> Change the mdev_type related sysfs attribute functions to:
> 
>   ssize_t (*show)(struct mdev_type *mtype, struct mdev_type_attribute *attr,..)
> 
> In order to restore type safety and match the driver core standard
> 
> There are no current users of 'attr', but if it is ever needed it would be
> hard to add in retroactively, so do it now.
> 
> Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
> ---
>  drivers/gpu/drm/i915/gvt/gvt.c    | 21 +++++++++++----------
>  drivers/s390/cio/vfio_ccw_ops.c   | 15 +++++++++------
>  drivers/s390/crypto/vfio_ap_ops.c | 12 +++++++-----
>  drivers/vfio/mdev/mdev_core.c     | 14 ++++++++++++--
>  drivers/vfio/mdev/mdev_sysfs.c    | 11 ++++++-----
>  include/linux/mdev.h              | 11 +++++++----
>  samples/vfio-mdev/mbochs.c        | 26 +++++++++++++++-----------
>  samples/vfio-mdev/mdpy.c          | 24 ++++++++++++++----------
>  samples/vfio-mdev/mtty.c          | 18 +++++++++---------
>  9 files changed, 90 insertions(+), 62 deletions(-)

Reviewed-by: Cornelia Huck <cohuck at redhat.com>