SNDRV_PCM_IOCTL_PREPARE 1095 sound/core/oss/pcm_oss.c err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL); SNDRV_PCM_IOCTL_PREPARE 490 sound/core/pcm_compat.c case SNDRV_PCM_IOCTL_PREPARE: SNDRV_PCM_IOCTL_PREPARE 2522 sound/core/pcm_native.c case SNDRV_PCM_IOCTL_PREPARE: