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Commit ac05dbc5 authored Feb 19, 2014 by Thomas Hellstrom

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>

parent c2667355

drivers/gpu/drm/drm_drv.c

+4 −3

Original line number	Original line	Diff line number	Diff line
	@@ -306,13 +306,14 @@ static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
	!file_priv->authenticated))		!file_priv->authenticated))
	return -EACCES;		return -EACCES;

	/* MASTER is only for master */		/* MASTER is only for master or control clients */
	if (unlikely((flags & DRM_MASTER) && !file_priv->is_master))		if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
			!drm_is_control_client(file_priv)))
	return -EACCES;		return -EACCES;

	/* Control clients must be explicitly allowed */		/* Control clients must be explicitly allowed */
	if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&		if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
	file_priv->minor->type == DRM_MINOR_CONTROL))		drm_is_control_client(file_priv)))
	return -EACCES;		return -EACCES;

	/* Render clients must be explicitly allowed */		/* Render clients must be explicitly allowed */

drivers/gpu/drm/drm_fops.c

+4 −2

Original line number	Original line	Diff line number	Diff line
	@@ -232,7 +232,8 @@ 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		/* if there is no current master make this fd it, but do not create
	* any master object for render clients */		* any master object for render clients */
	mutex_lock(&dev->struct_mutex);		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_client(priv)) {
	/* create a new master */		/* create a new master */
	priv->minor->master = drm_master_create(priv->minor);		priv->minor->master = drm_master_create(priv->minor);
	if (!priv->minor->master) {		if (!priv->minor->master) {
	@@ -270,7 +271,8 @@ static int drm_open_helper(struct inode inode, struct file filp,
	goto out_close;		goto out_close;
	}		}
	}		}
	} else if (!drm_is_render_client(priv)) {		} else if (!drm_is_render_client(priv) &&
			!drm_is_control_client(priv)) {
	/* get a reference to the master */		/* get a reference to the master */
	priv->master = drm_master_get(priv->minor->master);		priv->master = drm_master_get(priv->minor->master);
	}		}

include/drm/drmP.h

+5 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1207,6 +1207,11 @@ static inline bool drm_is_render_client(struct drm_file *file_priv)
	return file_priv->minor->type == DRM_MINOR_RENDER;		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 */		/** \name Internal function definitions */
	/@{/		/@{/

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