mixer/alsa: move code to alsa_mixer_setup()

src/mixer/alsa_mixer_plugin.c

@@ -81,16 +81,6 @@ alsa_mixer_finish(struct mixer *data)
 	snd_config_update_free_global();
 }
 
-static void
-alsa_mixer_close(struct mixer *data)
-{
-	struct alsa_mixer *am = (struct alsa_mixer *)data;
-
-	assert(am->handle != NULL);
-
-	snd_mixer_close(am->handle);
-}
-
 G_GNUC_PURE
 static snd_mixer_elem_t *
 alsa_mixer_lookup_elem(snd_mixer_t *handle, const char *name, unsigned idx)
@@ -109,22 +99,11 @@ alsa_mixer_lookup_elem(snd_mixer_t *handle, const char *name, unsigned idx)
 }
 
 static bool
-alsa_mixer_open(struct mixer *data, GError **error_r)
+alsa_mixer_setup(struct alsa_mixer *am, GError **error_r)
 {
-	struct alsa_mixer *am = (struct alsa_mixer *)data;
 	int err;
 
-	am->volume_set = -1;
-
-	err = snd_mixer_open(&am->handle, 0);
-	if (err < 0) {
-		g_set_error(error_r, alsa_mixer_quark(), err,
-			    "snd_mixer_open() failed: %s", snd_strerror(err));
-		return false;
-	}
-
 	if ((err = snd_mixer_attach(am->handle, am->device)) < 0) {
-		alsa_mixer_close(data);
 		g_set_error(error_r, alsa_mixer_quark(), err,
 			    "failed to attach to %s: %s",
 			    am->device, snd_strerror(err));
@@ -133,7 +112,6 @@ alsa_mixer_open(struct mixer *data, GError **error_r)
 
 	if ((err = snd_mixer_selem_register(am->handle, NULL,
 		    NULL)) < 0) {
-		alsa_mixer_close(data);
 		g_set_error(error_r, alsa_mixer_quark(), err,
 			    "snd_mixer_selem_register() failed: %s",
 			    snd_strerror(err));
@@ -141,7 +119,6 @@ alsa_mixer_open(struct mixer *data, GError **error_r)
 	}
 
 	if ((err = snd_mixer_load(am->handle)) < 0) {
-		alsa_mixer_close(data);
 		g_set_error(error_r, alsa_mixer_quark(), err,
 			    "snd_mixer_load() failed: %s\n",
 			    snd_strerror(err));
@@ -150,7 +127,6 @@ alsa_mixer_open(struct mixer *data, GError **error_r)
 
 	am->elem = alsa_mixer_lookup_elem(am->handle, am->control, am->index);
 	if (am->elem == NULL) {
-		alsa_mixer_close(data);
 		g_set_error(error_r, alsa_mixer_quark(), 0,
 			    "no such mixer control: %s", am->control);
 		return false;
@@ -162,6 +138,39 @@ alsa_mixer_open(struct mixer *data, GError **error_r)
 	return true;
 }
 
+static bool
+alsa_mixer_open(struct mixer *data, GError **error_r)
+{
+	struct alsa_mixer *am = (struct alsa_mixer *)data;
+	int err;
+
+	am->volume_set = -1;
+
+	err = snd_mixer_open(&am->handle, 0);
+	if (err < 0) {
+		g_set_error(error_r, alsa_mixer_quark(), err,
+			    "snd_mixer_open() failed: %s", snd_strerror(err));
+		return false;
+	}
+
+	if (!alsa_mixer_setup(am, error_r)) {
+		snd_mixer_close(am->handle);
+		return false;
+	}
+
+	return true;
+}
+
+static void
+alsa_mixer_close(struct mixer *data)
+{
+	struct alsa_mixer *am = (struct alsa_mixer *)data;
+
+	assert(am->handle != NULL);
+
+	snd_mixer_close(am->handle);
+}
+
 static int
 alsa_mixer_get_volume(struct mixer *mixer, GError **error_r)
 {