centos man page for snd_ctl_find_id

SND_CTL_FIND_ID(9)						 Control/Mixer API						SND_CTL_FIND_ID(9)

NAME
       snd_ctl_find_id - find the control instance with the given id

SYNOPSIS
       struct snd_kcontrol * snd_ctl_find_id(struct snd_card * card, struct snd_ctl_elem_id * id);

ARGUMENTS
       card
	   the card instance

       id
	   the id to search

DESCRIPTION
       Finds the control instance with the given id from the card.

       The caller must down card->controls_rwsem before calling this function (if the race condition can happen).

RETURN
       The pointer of the instance if found, or NULL if not.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							SND_CTL_FIND_ID(9)