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From:   Akshu Agrawal <akshu.agrawal@amd.com>
Cc:     djkurtz@chromium.org, akshu.agrawal@amd.com,
        Alexander.Deucher@amd.com, Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        "Mukunda, Vijendar" <Vijendar.Mukunda@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        Guenter Roeck <linux@roeck-us.net>,
        alsa-devel@alsa-project.org (moderated list:SOUND - SOC LAYER / DYNAMIC
        AUDIO POWER MANAGEM...), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH 1/2] ASoC: AMD: Add NULL pointer check
Date:   Thu,  7 Jun 2018 14:48:43 +0800
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Fix crash in those platforms whose machine driver does not expose
platform_info. For those platforms we rely on default value and
select I2SSP channel.

Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
---
 sound/soc/amd/acp-pcm-dma.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c
index 7720384..1458b50 100644
--- a/sound/soc/amd/acp-pcm-dma.c
+++ b/sound/soc/amd/acp-pcm-dma.c
@@ -773,7 +773,8 @@ static int acp_dma_hw_params(struct snd_pcm_substream *substream,
 	if (WARN_ON(!rtd))
 		return -EINVAL;
 
-	rtd->i2s_instance = pinfo->i2s_instance;
+	if (pinfo)
+		rtd->i2s_instance = pinfo->i2s_instance;
 	if (adata->asic_type == CHIP_STONEY) {
 		val = acp_reg_read(adata->acp_mmio,
 				   mmACP_I2S_16BIT_RESOLUTION_EN);
-- 
1.9.1