backend: drop wlr_backend_get_session()

This no longer has purpose.

backend/backend.c

@@ -66,13 +66,6 @@ void wlr_backend_destroy(struct wlr_backend *backend) {
 	}
 }
 
-struct wlr_session *wlr_backend_get_session(struct wlr_backend *backend) {
-	if (backend->impl->get_session) {
-		return backend->impl->get_session(backend);
-	}
-	return NULL;
-}
-
 static uint64_t get_current_time_ms(void) {
 	struct timespec ts = {0};
 	clock_gettime(CLOCK_MONOTONIC, &ts);
@@ -388,8 +381,6 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
 #endif
 
 success:
-	struct wlr_multi_backend *multi = wl_container_of(backend, multi, backend);
-	multi->session = session;
 	if (session_ptr != NULL) {
 		*session_ptr = session;
 	}

backend/multi/backend.c

@@ -4,7 +4,6 @@
 #include <stdlib.h>
 #include <time.h>
 #include <wlr/backend/interface.h>
-#include <wlr/backend/session.h>
 #include <wlr/types/wlr_buffer.h>
 #include <wlr/util/log.h>
 #include "backend/backend.h"
@@ -63,12 +62,6 @@ static void multi_backend_destroy(struct wlr_backend *wlr_backend) {
 	free(backend);
 }
 
-static struct wlr_session *multi_backend_get_session(
-		struct wlr_backend *_backend) {
-	struct wlr_multi_backend *backend = multi_backend_from_backend(_backend);
-	return backend->session;
-}
-
 static clockid_t multi_backend_get_presentation_clock(
 		struct wlr_backend *backend) {
 	struct wlr_multi_backend *multi = multi_backend_from_backend(backend);
@@ -121,7 +114,6 @@ static uint32_t multi_backend_get_buffer_caps(struct wlr_backend *backend) {
 static const struct wlr_backend_impl backend_impl = {
 	.start = multi_backend_start,
 	.destroy = multi_backend_destroy,
-	.get_session = multi_backend_get_session,
 	.get_presentation_clock = multi_backend_get_presentation_clock,
 	.get_drm_fd = multi_backend_get_drm_fd,
 	.get_buffer_caps = multi_backend_get_buffer_caps,

include/backend/multi.h

@@ -4,11 +4,9 @@
 #include <wayland-util.h>
 #include <wlr/backend/interface.h>
 #include <wlr/backend/multi.h>
-#include <wlr/backend/session.h>
 
 struct wlr_multi_backend {
 	struct wlr_backend backend;
-	struct wlr_session *session;
 
 	struct wl_list backends;
 

include/wlr/backend.h

@@ -51,11 +51,6 @@ bool wlr_backend_start(struct wlr_backend *backend);
  * automatically when the struct wl_display is destroyed.
  */
 void wlr_backend_destroy(struct wlr_backend *backend);
-/**
- * Obtains the struct wlr_session reference from this backend if there is any.
- * Might return NULL for backends that don't use a session.
- */
-struct wlr_session *wlr_backend_get_session(struct wlr_backend *backend);
 /**
  * Returns the clock used by the backend for presentation feedback.
  */

include/wlr/backend/interface.h

@@ -16,7 +16,6 @@
 struct wlr_backend_impl {
 	bool (*start)(struct wlr_backend *backend);
 	void (*destroy)(struct wlr_backend *backend);
-	struct wlr_session *(*get_session)(struct wlr_backend *backend);
 	clockid_t (*get_presentation_clock)(struct wlr_backend *backend);
 	int (*get_drm_fd)(struct wlr_backend *backend);
 	uint32_t (*get_buffer_caps)(struct wlr_backend *backend);