centos man page for snd_ctl_remove

SND_CTL_REMOVE(9)						 Control/Mixer API						 SND_CTL_REMOVE(9)

NAME
       snd_ctl_remove - remove the control from the card and release it

SYNOPSIS
       int snd_ctl_remove(struct snd_card * card, struct snd_kcontrol * kcontrol);

ARGUMENTS
       card
	   the card instance

       kcontrol
	   the control instance to remove

DESCRIPTION
       Removes the control from the card and then releases the instance. You don't need to call snd_ctl_free_one. You must be in the write lock -
       down_write(card->controls_rwsem).

RETURN
       0 if successful, or a negative error code on failure.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							 SND_CTL_REMOVE(9)