drm/gem: fold drm_gem_object_put_unlocked and __drm_gem_object_put()

With earlier patch we removed the overhead so now we can lift the helper
into the header effectively folding it with __drm_object_put.

v2: drop struct_mutex references (Daniel)

Signed-off-by: Emil Velikov <[e-mail]>
Acked-by: Sam Ravnborg <[e-mail]> (v1)
Reviewed-by: Daniel Vetter <[e-mail]>
Acked-by: Thomas Zimmermann <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/drm_gem.c

···
 EXPORT_SYMBOL(drm_gem_object_free);
 
 /**
- * drm_gem_object_put_unlocked - drop a GEM buffer object reference
- * @obj: GEM buffer object
- *
- * This releases a reference to @obj. Callers must not hold the
- * &drm_device.struct_mutex lock when calling this function.
- *
- * See also __drm_gem_object_put().
- */
-void
-drm_gem_object_put_unlocked(struct drm_gem_object *obj)
-{
-	if (!obj)
-		return;
-
-	kref_put(&obj->refcount, drm_gem_object_free);
-}
-EXPORT_SYMBOL(drm_gem_object_put_unlocked);
-
-/**
  * drm_gem_object_put - release a GEM buffer object reference
  * @obj: GEM buffer object
  *

drivers/gpu/drm/i915/gem/i915_gem_object.h

···
 static inline void
 i915_gem_object_put(struct drm_i915_gem_object *obj)
 {
-	__drm_gem_object_put(&obj->base);
+	drm_gem_object_put_unlocked(&obj->base);
 }
 
 #define assert_object_held(obj) dma_resv_assert_held((obj)->base.resv)

include/drm/drm_drv.h

···
 	 *
 	 * This is deprecated and should not be used by new drivers. Use
 	 * &drm_gem_object_funcs.free instead.
-	 * Compared to @gem_free_object this is not encumbered with
-	 * &drm_device.struct_mutex legacy locking schemes.
 	 */
 	void (*gem_free_object_unlocked) (struct drm_gem_object *obj);
 

include/drm/drm_gem.h

···
 }
 
 /**
- * __drm_gem_object_put - raw function to release a GEM buffer object reference
+ * drm_gem_object_put_unlocked - drop a GEM buffer object reference
  * @obj: GEM buffer object
  *
- * This function is meant to be used by drivers which are not encumbered with
- * &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_put() and drm_gem_object_put_unlocked().
- *
- * Drivers should never call this directly in their code. Instead they should
- * wrap it up into a ``driver_gem_object_put(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
- * &drm_device.struct_mutex locking.
+ * This releases a reference to @obj.
  */
 static inline void
-__drm_gem_object_put(struct drm_gem_object *obj)
+drm_gem_object_put_unlocked(struct drm_gem_object *obj)
 {
 	kref_put(&obj->refcount, drm_gem_object_free);
 }
 
-void drm_gem_object_put_unlocked(struct drm_gem_object *obj);
 void drm_gem_object_put(struct drm_gem_object *obj);
 
 int drm_gem_handle_create(struct drm_file *file_priv,