drm: Make control nodes master-less v3

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.

v2: Adapt to refactoring of ioctl permission check.
v3: Formatting of logical expression. Use drm_is_control_client() instead of
    drm_is_control().

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 2242968e7deb..3cf9f46ce2e6 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1207,6 +1207,11 @@ 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_client(const struct drm_file *file_priv)
+{
+        return file_priv->minor->type == DRM_MINOR_CONTROL;
+}
+
 /******************************************************************/
 /** \name Internal function definitions */
 /*@{*/