1. NAME▲
snd_ctl_find_id - find the control instance with the given id
2. SYNOPSIS ▲
struct snd_kcontrol * snd_ctl_find_id(struct snd_card * card , struct snd_ctl_elem_id * id );
3. ARGUMENTS ▲
card
    the card instance
id
    the id to search
4. 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).
5. RETURN ▲
The pointer of the instance if found, or NULL if not.
6. COPYRIGHT ▲