From: Agrawal, Akshu <Akshu.Agrawal@amd.com>
Date: Thu, 7 Jun 2018 06:48:43 +0000 (+0800)
Subject: ASoC: AMD: Add NULL pointer check
X-Git-Tag: v4.19-rc1~38^2~5^2~1^2~14
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=6e56e5d04191aa20e08430dcb203c081fa247e93;p=uclinux-h8%2Flinux.git

ASoC: AMD: Add NULL pointer check

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>
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c
index 77203841c535..1458b5048498 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);