[alsa-devel] Shutdown() vector in ALSA

why no ALSA driver has shutdown() vector implemented?

Is this vector needed to ensure the proper shutdown of the system?

What all needs to be taken care if i want to implement shutdown(), except hardware shutdown.

struct snd_shutdown_f_ops { struct file_operations f_ops; struct snd_shutdown_f_ops *next; };

what this operations means? defined in sound/core/init.c

Is there any need to call these functions? snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); for (i = 0; i < chip->pcm_devs; i++) snd_pcm_suspend_all(chip->pcm[i]);