Re: [alsa-devel] [PATCH v3 4/8] ASoC: wm_adsp: Add support for opening a compressed stream

On Tue, Dec 15, 2015 at 11:29:45AM +0000, Charles Keepax wrote:

+int wm_adsp_compr_open(struct wm_adsp *dsp, struct snd_compr_stream *stream) +{

• struct wm_adsp_compr *compr;
• int ret = 0;
• mutex_lock(&dsp->pwr_lock);
• if (wm_adsp_fw[dsp->fw].num_caps == 0) {

• adsp_err(dsp, "Firmware does not support compressed API\n");
  

• ret = -ENXIO;
  

• goto out;
  

• }
• if (wm_adsp_fw[dsp->fw].compr_direction != stream->direction) {

• adsp_err(dsp, "Firmware does not support stream direction\n");
  

• ret = -EINVAL;
  

• goto out;
  

• }
• compr = kzalloc(sizeof(*compr), GFP_KERNEL);

You're doing this under lock but not checking for an attempt to allocate on a DSP already in use.