Unverified Commit 08ea486a authored by Richard Fitzgerald's avatar Richard Fitzgerald Committed by Mark Brown
Browse files

ALSA: control: Introduce snd_ctl_find_id_mixer_locked() 



Adds wrapper function snd_ctl_find_id_mixer_locked(). This is
identical to snd_ctl_find_id_mixer() except that it can be called
from code that is already holding controls_rwsem.

Signed-off-by: default avatarRichard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: default avatarTakashi Iwai <tiwai@suse.de>
Link: https://msgid.link/r/20240401100210.61277-2-rf@opensource.cirrus.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 2ae143fb

include/sound/control.h

+23 −0
Original line number Diff line number Diff line
@@ -167,6 +167,29 @@ snd_ctl_find_id_mixer(struct snd_card *card, const char *name) 
	return snd_ctl_find_id(card, &id);

}



/**

 * snd_ctl_find_id_mixer_locked - find the control instance with the given name string

 * @card: the card instance

 * @name: the name string

 *

 * Finds the control instance with the given name and

 * @SNDRV_CTL_ELEM_IFACE_MIXER. Other fields are set to zero.

 *

 * This is merely a wrapper to snd_ctl_find_id_locked().

 * The caller must down card->controls_rwsem before calling this function.

 *

 * Return: The pointer of the instance if found, or %NULL if not.

 */

static inline struct snd_kcontrol *

snd_ctl_find_id_mixer_locked(struct snd_card *card, const char *name)

{

	struct snd_ctl_elem_id id = {};



	id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;

	strscpy(id.name, name, sizeof(id.name));

	return snd_ctl_find_id_locked(card, &id);

}



int snd_ctl_create(struct snd_card *card);



int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);