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ASoC: qcom: q6apm-dai: fix race condition while updating the position pointer

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It is noticed that the position pointer value seems to get a get corrupted
due to missing locking between updating and reading.

Fix this by adding a spinlock around the position pointer.

Fixes: 9b4fe0f1cd ("ASoC: qdsp6: audioreach: add q6apm-dai support")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230209122806.18923-3-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Srinivas Kandagatla
2023-02-09 12:28:00 +00:00
committed by Mark Brown
parent c2ac3aec47
commit 84222ef54b
1 changed files with 15 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
sound/soc/qcom/qdsp6/q6apm-dai.c
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@@ -8,6 +8,7 @@
#include <linux/slab.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <linux/spinlock.h>
#include <sound/pcm.h>
#include <asm/dma.h>
#include <linux/dma-mapping.h>
@@ -53,6 +54,7 @@ struct q6apm_dai_rtd {
uint16_t session_id;
enum stream_state state;
struct q6apm_graph *graph;
spinlock_t lock;
};
struct q6apm_dai_data {
@@ -99,20 +101,25 @@ static void event_handler(uint32_t opcode, uint32_t token, uint32_t *payload, vo
{
struct q6apm_dai_rtd *prtd = priv;
struct snd_pcm_substream *substream = prtd->substream;
unsigned long flags;
switch (opcode) {
case APM_CLIENT_EVENT_CMD_EOS_DONE:
prtd->state = Q6APM_STREAM_STOPPED;
break;
case APM_CLIENT_EVENT_DATA_WRITE_DONE:
spin_lock_irqsave(&prtd->lock, flags);
prtd->pos += prtd->pcm_count;
spin_unlock_irqrestore(&prtd->lock, flags);
snd_pcm_period_elapsed(substream);
if (prtd->state == Q6APM_STREAM_RUNNING)
q6apm_write_async(prtd->graph, prtd->pcm_count, 0, 0, 0);
break;
case APM_CLIENT_EVENT_DATA_READ_DONE:
spin_lock_irqsave(&prtd->lock, flags);
prtd->pos += prtd->pcm_count;
spin_unlock_irqrestore(&prtd->lock, flags);
snd_pcm_period_elapsed(substream);
if (prtd->state == Q6APM_STREAM_RUNNING)
q6apm_read(prtd->graph);
@@ -253,6 +260,7 @@ static int q6apm_dai_open(struct snd_soc_component *component,
if (prtd == NULL)
return -ENOMEM;
spin_lock_init(&prtd->lock);
prtd->substream = substream;
prtd->graph = q6apm_graph_open(dev, (q6apm_cb)event_handler, prtd, graph_id);
if (IS_ERR(prtd->graph)) {
@@ -332,11 +340,17 @@ static snd_pcm_uframes_t q6apm_dai_pointer(struct snd_soc_component *component,
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct q6apm_dai_rtd *prtd = runtime->private_data;
snd_pcm_uframes_t ptr;
unsigned long flags;
spin_lock_irqsave(&prtd->lock, flags);
if (prtd->pos == prtd->pcm_size)
prtd->pos = 0;
return bytes_to_frames(runtime, prtd->pos);
ptr = bytes_to_frames(runtime, prtd->pos);
spin_unlock_irqrestore(&prtd->lock, flags);
return ptr;
}
static int q6apm_dai_hw_params(struct snd_soc_component *component,