1 files changed, 18 insertions, 2 deletions

diff --git a/include/sound/control.h b/include/sound/control.h
index 4721b4bba053..4cf8f7aaa13f 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -171,6 +171,22 @@ int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
  */
 struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
                                                  const unsigned int *tlv);
-int snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave);
-                      
+int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,
+                       unsigned int flags);
+/* optional flags for slave */
+#define SND_CTL_SLAVE_NEED_UPDATE       (1 << 0)
+
+static inline int
+snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
+{
+        return _snd_ctl_add_slave(master, slave, 0);
+}
+
+static inline int
+snd_ctl_add_slave_uncached(struct snd_kcontrol *master,
+                           struct snd_kcontrol *slave)
+{
+        return _snd_ctl_add_slave(master, slave, SND_CTL_SLAVE_NEED_UPDATE);
+}
+
 #endif  /* __SOUND_CONTROL_H */