drm: un-inline drm_legacy_findmap()

Un-inline drm_legacy_findmap() to not depend on struct drm_device
definition within drm_legacy.h, so that a forward declaration suffices.

Also include drm_hashtab.h in drm_legacy.h to make it more
self-contained. Make it easier to drop drmP.h includes.

v2: avoid including drm_device.h by un-inlining (Daniel)

[Updated commit message per Laurent's review while applying.]

Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181228130446.22141-1-jani.nikula@intel.com

drivers/gpu/drm/drm_bufs.c

@@ -377,6 +377,17 @@ int drm_legacy_addmap(struct drm_device *dev, resource_size_t offset,
 }
 EXPORT_SYMBOL(drm_legacy_addmap);
 
+struct drm_local_map *drm_legacy_findmap(struct drm_device *dev,
+					 unsigned int token)
+{
+	struct drm_map_list *_entry;
+	list_for_each_entry(_entry, &dev->maplist, head)
+		if (_entry->user_token == token)
+			return _entry->map;
+	return NULL;
+}
+EXPORT_SYMBOL(drm_legacy_findmap);
+
 /**
  * Ioctl to specify a range of memory that is available for mapping by a
  * non-root process.

include/drm/drm_legacy.h

@@ -2,6 +2,9 @@
 #define __DRM_DRM_LEGACY_H__
 
 #include <drm/drm_auth.h>
+#include <drm/drm_hashtab.h>
+
+struct drm_device;
 
 /*
  * Legacy driver interfaces for the Direct Rendering Manager
@@ -156,6 +159,7 @@ struct drm_map_list {
 int drm_legacy_addmap(struct drm_device *d, resource_size_t offset,
 		      unsigned int size, enum drm_map_type type,
 		      enum drm_map_flags flags, struct drm_local_map **map_p);
+struct drm_local_map *drm_legacy_findmap(struct drm_device *dev, unsigned int token);
 void drm_legacy_rmmap(struct drm_device *d, struct drm_local_map *map);
 int drm_legacy_rmmap_locked(struct drm_device *d, struct drm_local_map *map);
 void drm_legacy_master_rmmaps(struct drm_device *dev,
@@ -194,14 +198,4 @@ void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev);
 void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev);
 void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev);
 
-static inline struct drm_local_map *drm_legacy_findmap(struct drm_device *dev,
-						       unsigned int token)
-{
-	struct drm_map_list *_entry;
-	list_for_each_entry(_entry, &dev->maplist, head)
-	    if (_entry->user_token == token)
-		return _entry->map;
-	return NULL;
-}
-
 #endif /* __DRM_DRM_LEGACY_H__ */