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ASoC: SOF: Intel: hda: hda-dai: fix oops on hda_link .hw_free 

When the PCM_PARAM IPC fails while configuring the FE, the kernel
oopses in the HDaudio link DMA .hw_free operation. The root cause is a
NULL dma_data since the BE .hw_params was never called by the SOC
core.

This error can also happen if the HDaudio link DMA configuration IPC
fails in the BE .hw_params.

This patches makes sure the dma_data is properly saved in .hw_params,
and tested before being use in hw_free.

GitHub issue: https://github.com/thesofproject/linux/issues/1417

Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191218000518.5830-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
alistair/sunxi64-5.5-dsi
Pierre-Louis Bossart 2019-12-17 18:05:17 -06:00 committed by Mark Brown
parent b06e46427f
commit 921162c81a
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 9 additions and 2 deletions
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11
sound/soc/sof/intel/hda-dai.c
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@ -216,6 +216,8 @@ static int hda_link_hw_params(struct snd_pcm_substream *substream,
link_dev = hda_link_stream_assign(bus, substream);
if (!link_dev)
return -EBUSY;
snd_soc_dai_set_dma_data(dai, substream, (void *)link_dev);
}
stream_tag = hdac_stream(link_dev)->stream_tag;
@ -228,8 +230,6 @@ static int hda_link_hw_params(struct snd_pcm_substream *substream,
if (ret < 0)
return ret;
snd_soc_dai_set_dma_data(dai, substream, (void *)link_dev);
link = snd_hdac_ext_bus_get_link(bus, codec_dai->component->name);
if (!link)
return -EINVAL;
@ -361,6 +361,13 @@ static int hda_link_hw_free(struct snd_pcm_substream *substream,
bus = hstream->bus;
rtd = snd_pcm_substream_chip(substream);
link_dev = snd_soc_dai_get_dma_data(dai, substream);
if (!link_dev) {
dev_dbg(dai->dev,
"%s: link_dev is not assigned\n", __func__);
return -EINVAL;
}
hda_stream = hstream_to_sof_hda_stream(link_dev);
/* free the link DMA channel in the FW */