ASoC: dmaengine: Add config parameter NULL check.

Because the "ASoC: dmaengine-pcm: Provide default config" has provided
us one defualt config of DMA. When using this, the config parameter of
devm_snd_dmaengine_pcm_register() will be NULL, so here we need to have
a check before using it.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
index 7483922f6ee3..2a6c569d991f 100644
--- a/sound/soc/soc-generic-dmaengine-pcm.c
+++ b/sound/soc/soc-generic-dmaengine-pcm.c
@@ -299,7 +299,7 @@ static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
             !dev->of_node)
                 return 0;
 
-        if (config->dma_dev) {
+        if (config && config->dma_dev) {
                 /*
                  * If this warning is seen, it probably means that your Linux
                  * device structure does not match your HW device structure.
@@ -317,7 +317,7 @@ static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
                         name = "rx-tx";
                 else
                         name = dmaengine_pcm_dma_channel_names[i];
-                if (config->chan_names[i])
+                if (config && config->chan_names[i])
                         name = config->chan_names[i];
                 chan = dma_request_slave_channel_reason(dev, name);
                 if (IS_ERR(chan)) {