[PATCH 4.9 02/43] ASoC: intel: atom: Fix reference to PCM buffer address

From: Sasha Levin
Date: Tue Aug 24 2021 - 13:36:11 EST

From: Takashi Iwai <tiwai@xxxxxxx>

commit 2e6b836312a477d647a7920b56810a5a25f6c856 upstream.

PCM buffers might be allocated dynamically when the buffer
preallocation failed or a larger buffer is requested, and it's not
guaranteed that substream->dma_buffer points to the actually used
buffer. The address should be retrieved from runtime->dma_addr,
instead of substream->dma_buffer (and shouldn't use virt_to_phys).

Also, remove the line overriding runtime->dma_area superfluously,
which was already set up at the PCM buffer allocation.

Cc: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Link: https://lore.kernel.org/r/20210728112353.6675-3-tiwai@xxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
sound/soc/intel/atom/sst-mfld-platform-pcm.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/sound/soc/intel/atom/sst-mfld-platform-pcm.c b/sound/soc/intel/atom/sst-mfld-platform-pcm.c
index d812cbf41b94..6303b2d3982d 100644
--- a/sound/soc/intel/atom/sst-mfld-platform-pcm.c
+++ b/sound/soc/intel/atom/sst-mfld-platform-pcm.c
@@ -135,7 +135,7 @@ static void sst_fill_alloc_params(struct snd_pcm_substream *substream,
snd_pcm_uframes_t period_size;
ssize_t periodbytes;
ssize_t buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
- u32 buffer_addr = virt_to_phys(substream->dma_buffer.area);
+ u32 buffer_addr = substream->runtime->dma_addr;

channels = substream->runtime->channels;
period_size = substream->runtime->period_size;
@@ -241,7 +241,6 @@ static int sst_platform_alloc_stream(struct snd_pcm_substream *substream,
/* set codec params and inform SST driver the same */
sst_fill_pcm_params(substream, &param);
sst_fill_alloc_params(substream, &alloc_params);
- substream->runtime->dma_area = substream->dma_buffer.area;
str_params.sparams = param;
str_params.aparams = alloc_params;
str_params.codec = SST_CODEC_TYPE_PCM;