Hello Oder Chiou,
This is a semi-automatic email about new static checker warnings.
The patch 6eebf35b0e4a: "ASoC: rt5514: add rt5514 SPI driver" from Jun 6, 2016, leads to the following Smatch complaint:
sound/soc/codecs/rt5514-spi.c:87 rt5514_spi_copy_work() warn: variable dereferenced before check 'rt5514_dsp->substream' (see line 83)
sound/soc/codecs/rt5514-spi.c 82 container_of(work, struct rt5514_dsp, copy_work.work); 83 struct snd_pcm_runtime *runtime = rt5514_dsp->substream->runtime; ^^^^^^^^^^^^^^^^^^^^^^^ Dereference.
84 size_t period_bytes, truncated_bytes = 0; 85 86 mutex_lock(&rt5514_dsp->dma_lock); 87 if (!rt5514_dsp->substream) { ^^^^^^^^^^^^^^^^^^^^^ Checked too late.
88 dev_err(rt5514_dsp->dev, "No pcm substream\n"); 89 goto done;
regards, dan carpenter