static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
			    struct snd_pcm_sync_ptr __user *_sync_ptr)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_sync_ptr sync_ptr;
	volatile struct snd_pcm_mmap_status *status;
	volatile struct snd_pcm_mmap_control *control;
	int err;

	memset(&sync_ptr, 0, sizeof(sync_ptr));
	if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
		return -EFAULT;
	if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
		return -EFAULT;	
	status = runtime->status;
	control = runtime->control;
	if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
		err = snd_pcm_hwsync(substream);
		if (err < 0)
			return err;
	}
	snd_pcm_stream_lock_irq(substream);
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
		err = pcm_lib_apply_appl_ptr(substream,
					     sync_ptr.c.control.appl_ptr);
		if (err < 0) {
			snd_pcm_stream_unlock_irq(substream);
			return err;
		}
	} else {
		sync_ptr.c.control.appl_ptr = control->appl_ptr;
	}
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
		control->avail_min = sync_ptr.c.control.avail_min;
	else
		sync_ptr.c.control.avail_min = control->avail_min;
	sync_ptr.s.status.state = status->state;
	sync_ptr.s.status.hw_ptr = status->hw_ptr;
	sync_ptr.s.status.tstamp = status->tstamp;
	sync_ptr.s.status.suspended_state = status->suspended_state;
	sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
	snd_pcm_stream_unlock_irq(substream);
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
		snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
	if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
		return -EFAULT;
	return 0;
}
static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
			    struct snd_pcm_sync_ptr __user *_sync_ptr)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_sync_ptr sync_ptr;
	volatile struct snd_pcm_mmap_status *status;
	volatile struct snd_pcm_mmap_control *control;
	int err;

	memset(&sync_ptr, 0, sizeof(sync_ptr));
	if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
		return -EFAULT;
	if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
		return -EFAULT;	
	status = runtime->status;
	control = runtime->control;
	if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
		err = snd_pcm_hwsync(substream);
		if (err < 0)
			return err;
	}
	snd_pcm_stream_lock_irq(substream);
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
		err = pcm_lib_apply_appl_ptr(substream,
					     sync_ptr.c.control.appl_ptr);
		if (err < 0) {
			snd_pcm_stream_unlock_irq(substream);
			return err;
		}
	} else {
		sync_ptr.c.control.appl_ptr = control->appl_ptr;
	}
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
		control->avail_min = sync_ptr.c.control.avail_min;
	else
		sync_ptr.c.control.avail_min = control->avail_min;
	sync_ptr.s.status.state = status->state;
	sync_ptr.s.status.hw_ptr = status->hw_ptr;
	sync_ptr.s.status.tstamp = status->tstamp;
	sync_ptr.s.status.suspended_state = status->suspended_state;
	sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
	snd_pcm_stream_unlock_irq(substream);
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
		snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
	if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
		return -EFAULT;
	return 0;
}