gallium/radeon: set texture metadata only once

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/gallium/drivers/radeon/r600_buffer_common.c

@@ -455,6 +455,7 @@ r600_alloc_buffer_struct(struct pipe_screen *screen,
 	rbuffer->b.vtbl = &r600_buffer_vtbl;
 	rbuffer->buf = NULL;
 	rbuffer->TC_L2_dirty = false;
+	rbuffer->is_shared = false;
 	util_range_init(&rbuffer->valid_buffer_range);
 	return rbuffer;
 }

src/gallium/drivers/radeon/r600_pipe_common.h

@@ -166,6 +166,9 @@ struct r600_resource {
 	 * use TC L2.
 	 */
 	bool				TC_L2_dirty;
+
+	/* Whether the resource has been exported via resource_get_handle. */
+	bool				is_shared;
 };
 
 struct r600_transfer {

src/gallium/drivers/radeon/r600_texture.c

@@ -259,8 +259,11 @@ static boolean r600_texture_get_handle(struct pipe_screen* screen,
 	struct r600_texture *rtex = (struct r600_texture*)resource;
 	struct radeon_bo_metadata metadata;
 
-	r600_texture_init_metadata(rtex, &metadata);
-	rscreen->ws->buffer_set_metadata(res->buf, &metadata);
+	if (!res->is_shared) {
+		res->is_shared = true;
+		r600_texture_init_metadata(rtex, &metadata);
+		rscreen->ws->buffer_set_metadata(res->buf, &metadata);
+	}
 
 	return rscreen->ws->buffer_get_handle(res->buf,
 					      rtex->surface.level[0].pitch_bytes,