@@ -2073,6 +2073,9 @@ static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
return ret;
}
+static int dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
+ struct snd_soc_pcm_runtime *be, int stream);
+
static int dpcm_do_trigger(struct snd_soc_dpcm *dpcm,
struct snd_pcm_substream *substream, int cmd)
{
@@ -2092,8 +2095,10 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
int cmd)
{
struct snd_soc_dpcm *dpcm;
+ unsigned long flags;
int ret = 0;
+ spin_lock_irqsave(&fe->card->dpcm_lock, flags);
for_each_dpcm_be(fe, stream, dpcm) {
struct snd_soc_pcm_runtime *be = dpcm->be;
@@ -2113,7 +2118,7 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
- return ret;
+ break;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
@@ -2123,7 +2128,7 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
- return ret;
+ break;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
@@ -2133,7 +2138,7 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
- return ret;
+ break;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_START;
break;
@@ -2142,12 +2147,12 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
(be->dpcm[stream].state != SND_SOC_DPCM_STATE_PAUSED))
continue;
- if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ if (!dpcm_can_be_free_stop(fe, be, stream))
continue;
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
- return ret;
+ break;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_STOP;
break;
@@ -2155,12 +2160,12 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
continue;
- if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ if (!dpcm_can_be_free_stop(fe, be, stream))
continue;
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
- return ret;
+ break;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_SUSPEND;
break;
@@ -2168,17 +2173,20 @@ int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
if (be->dpcm[stream].state != SND_SOC_DPCM_STATE_START)
continue;
- if (!snd_soc_dpcm_can_be_free_stop(fe, be, stream))
+ if (!dpcm_can_be_free_stop(fe, be, stream))
continue;
ret = dpcm_do_trigger(dpcm, be_substream, cmd);
if (ret)
- return ret;
+ break;
be->dpcm[stream].state = SND_SOC_DPCM_STATE_PAUSED;
break;
}
+ if (ret)
+ break;
}
+ spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
return ret;
}
@@ -2916,10 +2924,9 @@ static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
struct snd_soc_dpcm *dpcm;
int state;
int ret = 1;
- unsigned long flags;
int i;
- spin_lock_irqsave(&fe->card->dpcm_lock, flags);
+ lockdep_assert_held(&fe->card->dpcm_lock);
for_each_dpcm_fe(be, stream, dpcm) {
if (dpcm->fe == fe)
@@ -2933,17 +2940,12 @@ static int snd_soc_dpcm_check_state(struct snd_soc_pcm_runtime *fe,
}
}
}
- spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
/* it's safe to do this BE DAI */
return ret;
}
-/*
- * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
- * are not running, paused or suspended for the specified stream direction.
- */
-int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
+static int dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
struct snd_soc_pcm_runtime *be, int stream)
{
const enum snd_soc_dpcm_state state[] = {
@@ -2954,6 +2956,23 @@ int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
}
+
+/*
+ * We can only hw_free, stop, pause or suspend a BE DAI if any of it's FE
+ * are not running, paused or suspended for the specified stream direction.
+ */
+int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
+ struct snd_soc_pcm_runtime *be, int stream)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&fe->card->dpcm_lock, flags);
+ ret = dpcm_can_be_free_stop(fe, be, stream);
+ spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
+
+ return ret;
+}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
/*
@@ -2963,6 +2982,9 @@ EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_free_stop);
int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
struct snd_soc_pcm_runtime *be, int stream)
{
+ unsigned long flags;
+ int ret;
+
const enum snd_soc_dpcm_state state[] = {
SND_SOC_DPCM_STATE_START,
SND_SOC_DPCM_STATE_PAUSED,
@@ -2970,6 +2992,10 @@ int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
SND_SOC_DPCM_STATE_PREPARE,
};
- return snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
+ spin_lock_irqsave(&fe->card->dpcm_lock, flags);
+ ret = snd_soc_dpcm_check_state(fe, be, stream, state, ARRAY_SIZE(state));
+ spin_unlock_irqrestore(&fe->card->dpcm_lock, flags);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dpcm_can_be_params);
If stop by underrun and DPCM BE disconnection is run simultaneously, data abort can be occurred by the sequence below. /* In core X, running dpcm_be_dai_trigger() */ for_each_dpcm_be(fe, stream, dpcm) { /* In core Y, running dpcm_be_disconnect() */ spin_lock_irqsave(&fe->card->dpcm_lock, flags); list_del(&dpcm->list_be); list_del(&dpcm->list_fe); spin_unlock_irqrestore(&fe->card->dpcm_lock, flags); kfree(dpcm); /* In core X, running dpcm_be_dai_trigger() */ struct snd_soc_pcm_runtime *be = dpcm->be; <== Accessing freed memory To prevent this situation, dpcm_lock should be acquired during iteration of dpcm list in dpcm_do_trigger(). Signed-off-by: Gyeongtaek Lee <gt82.lee@samsung.com> Cc: stable@vger.kernel.org --- sound/soc/soc-pcm.c | 62 ++++++++++++++++++++++++++++++++------------- 1 file changed, 44 insertions(+), 18 deletions(-) base-commit: fa02fcd94b0c8dff6cc65714510cf25ad194b90d