drm/gem|prime|mm: Use recommened kerneldoc for struct member refs

I just learned that &struct_name.member_name works and looks pretty
even. It doesn't (yet) link to the member directly though, which would
be really good for big structures or vfunc tables (where the
per-member kerneldoc tends to be long).

Also some minor drive-by polish where it makes sense, I read a lot
of docs ...

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: NGustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170125062657.19270-5-daniel.vetter@ffwll.ch

drivers/gpu/drm/drm_gem.c

@@ -316,8 +316,8 @@ EXPORT_SYMBOL(drm_gem_handle_delete);
  * @dev: corresponding drm_device
  * @handle: the dumb handle to remove
  * 
- * This implements the ->dumb_destroy kms driver callback for drivers which use
- * gem to manage their backing storage.
+ * This implements the &drm_driver.dumb_destroy kms driver callback for drivers
+ * which use gem to manage their backing storage.
  */
 int drm_gem_dumb_destroy(struct drm_file *file,
 			 struct drm_device *dev,
@@ -333,9 +333,9 @@ EXPORT_SYMBOL(drm_gem_dumb_destroy);
  * @obj: object to register
  * @handlep: pointer to return the created handle to the caller
  * 
- * This expects the dev->object_name_lock to be held already and will drop it
- * before returning. Used to avoid races in establishing new handles when
- * importing an object from either an flink name or a dma-buf.
+ * This expects the &drm_device.object_name_lock to be held already and will
+ * drop it before returning. Used to avoid races in establishing new handles
+ * when importing an object from either an flink name or a dma-buf.
  *
  * Handles must be release again through drm_gem_handle_delete(). This is done
  * when userspace closes @file_priv for all attached handles, or through the
@@ -447,8 +447,8 @@ EXPORT_SYMBOL(drm_gem_free_mmap_offset);
  * structures.
  *
  * This routine allocates and attaches a fake offset for @obj, in cases where
- * the virtual size differs from the physical size (ie. obj->size).  Otherwise
- * just use drm_gem_create_mmap_offset().
+ * the virtual size differs from the physical size (ie. &drm_gem_object.size).
+ * Otherwise just use drm_gem_create_mmap_offset().
  *
  * This function is idempotent and handles an already allocated mmap offset
  * transparently. Drivers do not need to check for this case.
@@ -787,7 +787,7 @@ EXPORT_SYMBOL(drm_gem_object_release);
  * @kref: kref of the object to free
  *
  * Called after the last reference to the object has been lost.
- * Must be called holding &drm_device->struct_mutex.
+ * Must be called holding &drm_device.struct_mutex.
  *
  * Frees the object
  */
@@ -813,7 +813,7 @@ EXPORT_SYMBOL(drm_gem_object_free);
  * @obj: GEM buffer object
  *
  * This releases a reference to @obj. Callers must not hold the
- * dev->struct_mutex lock when calling this function.
+ * &drm_device.struct_mutex lock when calling this function.
  *
  * See also __drm_gem_object_unreference().
  */
@@ -840,9 +840,9 @@ EXPORT_SYMBOL(drm_gem_object_unreference_unlocked);
  * drm_gem_object_unreference - release a GEM BO reference
  * @obj: GEM buffer object
  *
- * This releases a reference to @obj. Callers must hold the dev->struct_mutex
- * lock when calling this function, even when the driver doesn't use
- * dev->struct_mutex for anything.
+ * This releases a reference to @obj. Callers must hold the
+ * &drm_device.struct_mutex lock when calling this function, even when the
+ * driver doesn't use &drm_device.struct_mutex for anything.
  *
  * For drivers not encumbered with legacy locking use
  * drm_gem_object_unreference_unlocked() instead.

drivers/gpu/drm/drm_mm.c

@@ -552,8 +552,8 @@ EXPORT_SYMBOL(drm_mm_replace_node);
  * objects to the roster, probably by walking an LRU list, but this can be
  * freely implemented. Eviction candiates are added using
  * drm_mm_scan_add_block() until a suitable hole is found or there are no
- * further evictable objects. Eviction roster metadata is tracked in struct
- * &drm_mm_scan.
+ * further evictable objects. Eviction roster metadata is tracked in &struct
+ * drm_mm_scan.
  *
  * The driver must walk through all objects again in exactly the reverse
  * order to restore the allocator state. Note that while the allocator is used

drivers/gpu/drm/drm_prime.c

@@ -291,7 +291,7 @@ static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
  * This wraps dma_buf_export() for use by generic GEM drivers that are using
  * drm_gem_dmabuf_release(). In addition to calling dma_buf_export(), we take
  * a reference to the &drm_device and the exported &drm_gem_object (stored in
- * exp_info->priv) which is released by drm_gem_dmabuf_release().
+ * &dma_buf_export_info.priv) which is released by drm_gem_dmabuf_release().
  *
  * Returns the new dmabuf.
  */

include/drm/drm_gem.h

@@ -63,7 +63,7 @@ struct drm_gem_object {
 	 * drops to 0 any global names (e.g. the id in the flink namespace) will
 	 * be cleared.
 	 *
-	 * Protected by dev->object_name_lock.
+	 * Protected by &drm_device.object_name_lock.
 	 */
 	unsigned handle_count;
 
@@ -106,8 +106,8 @@ struct drm_gem_object {
 	 * @name:
 	 *
 	 * Global name for this object, starts at 1. 0 means unnamed.
-	 * Access is covered by dev->object_name_lock. This is used by the GEM_FLINK
-	 * and GEM_OPEN ioctls.
+	 * Access is covered by &drm_device.object_name_lock. This is used by
+	 * the GEM_FLINK and GEM_OPEN ioctls.
 	 */
 	int name;
 
@@ -150,7 +150,7 @@ struct drm_gem_object {
 	 * through importing or exporting). We break the resulting reference
 	 * loop when the last gem handle for this object is released.
 	 *
-	 * Protected by obj->object_name_lock.
+	 * Protected by &drm_device.object_name_lock.
 	 */
 	struct dma_buf *dma_buf;
 
@@ -163,7 +163,7 @@ struct drm_gem_object {
 	 * attachment point for the device. This is invariant over the lifetime
 	 * of a gem object.
 	 *
-	 * The driver's ->gem_free_object callback is responsible for cleaning
+	 * The &drm_driver.gem_free_object callback is responsible for cleaning
 	 * up the dma_buf attachment and references acquired at import time.
 	 *
 	 * Note that the drm gem/prime core does not depend upon drivers setting
@@ -204,7 +204,7 @@ drm_gem_object_reference(struct drm_gem_object *obj)
  * @obj: GEM buffer object
  *
  * This function is meant to be used by drivers which are not encumbered with
- * dev->struct_mutex legacy locking and which are using the
+ * &drm_device.struct_mutex legacy locking and which are using the
  * gem_free_object_unlocked callback. It avoids all the locking checks and
  * locking overhead of drm_gem_object_unreference() and
  * drm_gem_object_unreference_unlocked().
@@ -212,8 +212,8 @@ drm_gem_object_reference(struct drm_gem_object *obj)
  * Drivers should never call this directly in their code. Instead they should
  * wrap it up into a ``driver_gem_object_unreference(struct driver_gem_object
  * *obj)`` wrapper function, and use that. Shared code should never call this, to
- * avoid breaking drivers by accident which still depend upon dev->struct_mutex
- * locking.
+ * avoid breaking drivers by accident which still depend upon
+ * &drm_device.struct_mutex locking.
  */
 static inline void
 __drm_gem_object_unreference(struct drm_gem_object *obj)