Merge "ASoC: msm: qdsp6v2: add check for NULL dereference"

/* Copyright (c) 2013, The Linux Foundation. All rights reserved.

/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU General Public License version 2 and

static void stop_pcm(struct msm_pcm_loopback *pcm)

{

	struct snd_soc_pcm_runtime *soc_pcm_rx =

		pcm->playback_substream->private_data;

	struct snd_soc_pcm_runtime *soc_pcm_tx =

		pcm->capture_substream->private_data;

	struct snd_soc_pcm_runtime *soc_pcm_rx;

	struct snd_soc_pcm_runtime *soc_pcm_tx;

	if (pcm->audio_client == NULL)

		return;

	q6asm_cmd(pcm->audio_client, CMD_CLOSE);

	if (pcm->playback_substream != NULL) {

		soc_pcm_rx = pcm->playback_substream->private_data;

		msm_pcm_routing_dereg_phy_stream(soc_pcm_rx->dai_link->be_id,

				SNDRV_PCM_STREAM_PLAYBACK);

	}

	if (pcm->capture_substream != NULL) {

		soc_pcm_tx = pcm->capture_substream->private_data;

		msm_pcm_routing_dereg_phy_stream(soc_pcm_tx->dai_link->be_id,

				SNDRV_PCM_STREAM_CAPTURE);

	}

	q6asm_audio_client_free(pcm->audio_client);

	pcm->audio_client = NULL;

}