backend/drm: remove backend arg from wlr_drm_interface.crtc_commit

The callee can just get it from the wlr_drm_connector.

backend/drm/atomic.c

@@ -166,9 +166,9 @@ error:
 	atom->failed = true;
 }
 
-static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
-		struct wlr_drm_connector *conn, const struct wlr_output_state *state,
-		uint32_t flags, bool test_only) {
+static bool atomic_crtc_commit(struct wlr_drm_connector *conn,
+		const struct wlr_output_state *state, uint32_t flags, bool test_only) {
+	struct wlr_drm_backend *drm = conn->backend;
 	struct wlr_output *output = &conn->output;
 	struct wlr_drm_crtc *crtc = conn->crtc;
 

backend/drm/drm.c

@@ -351,7 +351,7 @@ static bool drm_crtc_commit(struct wlr_drm_connector *conn,
 
 	struct wlr_drm_backend *drm = conn->backend;
 	struct wlr_drm_crtc *crtc = conn->crtc;
-	bool ok = drm->iface->crtc_commit(drm, conn, state, flags, test_only);
+	bool ok = drm->iface->crtc_commit(conn, state, flags, test_only);
 	if (ok && !test_only) {
 		drm_plane_set_committed(crtc->primary);
 		if (crtc->cursor != NULL) {

backend/drm/legacy.c

@@ -20,9 +20,8 @@ static bool legacy_crtc_test(struct wlr_drm_connector *conn,
 	return true;
 }
 
-static bool legacy_crtc_commit(struct wlr_drm_backend *drm,
-		struct wlr_drm_connector *conn, const struct wlr_output_state *state,
-		uint32_t flags, bool test_only) {
+static bool legacy_crtc_commit(struct wlr_drm_connector *conn,
+		const struct wlr_output_state *state, uint32_t flags, bool test_only) {
 	if (!legacy_crtc_test(conn, state)) {
 		return false;
 	}
@@ -30,6 +29,7 @@ static bool legacy_crtc_commit(struct wlr_drm_backend *drm,
 		return true;
 	}
 
+	struct wlr_drm_backend *drm = conn->backend;
 	struct wlr_output *output = &conn->output;
 	struct wlr_drm_crtc *crtc = conn->crtc;
 	struct wlr_drm_plane *cursor = crtc->cursor;

include/backend/drm/iface.h

@@ -13,10 +13,9 @@ struct wlr_drm_crtc;
 
 // Used to provide atomic or legacy DRM functions
 struct wlr_drm_interface {
-	// Commit al pending changes on a CRTC.
-	bool (*crtc_commit)(struct wlr_drm_backend *drm,
-		struct wlr_drm_connector *conn, const struct wlr_output_state *state,
-		uint32_t flags, bool test_only);
+	// Commit all pending changes on a CRTC.
+	bool (*crtc_commit)(struct wlr_drm_connector *conn,
+		const struct wlr_output_state *state, uint32_t flags, bool test_only);
 };
 
 extern const struct wlr_drm_interface atomic_iface;