[PATCH 1/2] drm: Make control nodes master-less

[David Herrmann]

Hi

On Wed, Feb 19, 2014 at 2:40 PM, Thomas Hellstrom <thellstrom at vmware.com> wrote:
> Like for render-nodes, there is no point in maintaining the master concept
> for control nodes, so set the struct drm_file::master pointer to NULL.
>
> At the same time, make sure DRM_MASTER | DRM_CONTROL_ALLOW ioctls are always
> allowed when called through the control node. Previously the caller also
> needed to be master.
>
> Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
> ---
>  drivers/gpu/drm/drm_drv.c  |    5 +++--
>  drivers/gpu/drm/drm_fops.c |    5 +++--
>  include/drm/drmP.h         |    5 +++++
>  3 files changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 345be03..42af8bd 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -355,8 +355,9 @@ long drm_ioctl(struct file *filp,
>                 retcode = -EINVAL;
>         } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
>                    ((ioctl->flags & DRM_AUTH) && !drm_is_render_client(file_priv) && !file_priv->authenticated) ||
> -                  ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
> -                  (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL)) ||
> +                  (((ioctl->flags & DRM_MASTER) && !file_priv->is_master) &&
> +                   !(drm_is_control(file_priv) && (ioctl->flags & DRM_CONTROL_ALLOW))) ||
> +                  (!(ioctl->flags & DRM_CONTROL_ALLOW) && drm_is_control(file_priv)) ||
>                    (!(ioctl->flags & DRM_RENDER_ALLOW) && drm_is_render_client(file_priv))) {
>                 retcode = -EACCES;
>         } else {
> diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
> index 7f2af9a..08a3196 100644
> --- a/drivers/gpu/drm/drm_fops.c
> +++ b/drivers/gpu/drm/drm_fops.c
> @@ -259,7 +259,8 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
>         /* if there is no current master make this fd it, but do not create
>          * any master object for render clients */
>         mutex_lock(&dev->struct_mutex);
> -       if (!priv->minor->master && !drm_is_render_client(priv)) {
> +       if (!priv->minor->master && !drm_is_render_client(priv) &&
> +           !drm_is_control(priv)) {
>                 /* create a new master */
>                 priv->minor->master = drm_master_create(priv->minor);
>                 if (!priv->minor->master) {
> @@ -297,7 +298,7 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
>                                 goto out_close;
>                         }
>                 }
> -       } else if (!drm_is_render_client(priv)) {
> +       } else if (!drm_is_render_client(priv) && !drm_is_control(priv)) {
>                 /* get a reference to the master */
>                 priv->master = drm_master_get(priv->minor->master);

Maybe I missed some other patches, but how is this going to work?
drm_crtc.c expects priv->master to be non-NULL (eg.,
drm_mode_getresources()). This is fine for render-nodes as they don't
allow any of those ioctls, but the control-node does allow them.

Thanks
David

>         }
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 04a7f31..ff68e26 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -1246,6 +1246,11 @@ static inline bool drm_is_render_client(struct drm_file *file_priv)
>         return file_priv->minor->type == DRM_MINOR_RENDER;
>  }
>
> +static inline bool drm_is_control(struct drm_file *file_priv)
> +{
> +       return file_priv->minor->type == DRM_MINOR_CONTROL;
> +}
> +
>  /******************************************************************/
>  /** \name Internal function definitions */
>  /*@{*/
> --
> 1.7.10.4
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