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ASoC: dapm: Fix NULL pointer deference on CODEC to CODEC DAIs

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Commit a655de808c ("ASoC: core: Allow topology to override
machine driver FE DAI link config.") caused soc_dai_hw_params to
be come dependent on the substream private_data being set with
a pointer to the snd_soc_pcm_runtime. Currently, CODEC to CODEC
links don't set this, which causes a NULL pointer dereference:

[<4069de54>] (soc_dai_hw_params) from
[<40694b68>] (snd_soc_dai_link_event+0x1a0/0x380)

Since the ASoC core in general assumes that the substream
private_data will be set to a pointer to the snd_soc_pcm_runtime,
update the CODEC to CODEC links to respect this.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Charles Keepax 2018-08-15 13:11:35 +01:00 committed by Mark Brown
parent 12eeeb4f47
commit 249dc49576
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
3 changed files with 7 additions and 2 deletions
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1
include/sound/soc-dapm.h
View file

@ -407,6 +407,7 @@ int snd_soc_dapm_new_dai_widgets(struct snd_soc_dapm_context *dapm,
int snd_soc_dapm_link_dai_widgets(struct snd_soc_card *card);
void snd_soc_dapm_connect_dai_link_widgets(struct snd_soc_card *card);
int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
struct snd_soc_pcm_runtime *rtd,
const struct snd_soc_pcm_stream *params,
unsigned int num_params,
struct snd_soc_dapm_widget *source,

4
sound/soc/soc-core.c
View file

@ -1447,7 +1447,7 @@ static int soc_link_dai_widgets(struct snd_soc_card *card,
sink = codec_dai->playback_widget;
source = cpu_dai->capture_widget;
if (sink && source) {
ret = snd_soc_dapm_new_pcm(card, dai_link->params,
ret = snd_soc_dapm_new_pcm(card, rtd, dai_link->params,
dai_link->num_params,
source, sink);
if (ret != 0) {
@ -1460,7 +1460,7 @@ static int soc_link_dai_widgets(struct snd_soc_card *card,
sink = cpu_dai->playback_widget;
source = codec_dai->capture_widget;
if (sink && source) {
ret = snd_soc_dapm_new_pcm(card, dai_link->params,
ret = snd_soc_dapm_new_pcm(card, rtd, dai_link->params,
dai_link->num_params,
source, sink);
if (ret != 0) {

4
sound/soc/soc-dapm.c
View file

@ -3652,6 +3652,7 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
{
struct snd_soc_dapm_path *source_p, *sink_p;
struct snd_soc_dai *source, *sink;
struct snd_soc_pcm_runtime *rtd = w->priv;
const struct snd_soc_pcm_stream *config = w->params + w->params_select;
struct snd_pcm_substream substream;
struct snd_pcm_hw_params *params = NULL;
@ -3711,6 +3712,7 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
goto out;
}
substream.runtime = runtime;
substream.private_data = rtd;
switch (event) {
case SND_SOC_DAPM_PRE_PMU:
@ -3895,6 +3897,7 @@ snd_soc_dapm_alloc_kcontrol(struct snd_soc_card *card,
}
int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
struct snd_soc_pcm_runtime *rtd,
const struct snd_soc_pcm_stream *params,
unsigned int num_params,
struct snd_soc_dapm_widget *source,
@ -3963,6 +3966,7 @@ int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
w->params = params;
w->num_params = num_params;
w->priv = rtd;
ret = snd_soc_dapm_add_path(&card->dapm, source, w, NULL, NULL);
if (ret)