Commit 20d9fdee authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Mark Brown

ASoC: soc-core: add snd_soc_find_dai_with_mutex()

commit 25612477 ("ASoC: soc-dai: set dai_link dpcm_ flags with a helper")
added snd_soc_dai_link_set_capabilities().
But it is using snd_soc_find_dai() (A) which is required client_mutex (B).
And client_mutex is soc-core.c local.

	struct snd_soc_dai *snd_soc_find_dai(xxx)
	{
		...
(B)		lockdep_assert_held(&client_mutex);
		...
	}

	void snd_soc_dai_link_set_capabilities(xxx)
	{
		...
		for_each_pcm_streams(direction) {
			...
			for_each_link_cpus(dai_link, i, cpu) {
(A)				dai = snd_soc_find_dai(cpu);
				...
			}
			...
			for_each_link_codecs(dai_link, i, codec) {
(A)				dai = snd_soc_find_dai(codec);
				...
			}
		}
		...
	}

Because of these background, we will get WARNING if .config has CONFIG_LOCKDEP.

	WARNING: CPU: 2 PID: 53 at sound/soc/soc-core.c:814 snd_soc_find_dai+0xf8/0x100
	CPU: 2 PID: 53 Comm: kworker/2:1 Not tainted 5.7.0-rc1+ #328
	Hardware name: Renesas H3ULCB Kingfisher board based on r8a77951 (DT)
	Workqueue: events deferred_probe_work_func
	pstate: 60000005 (nZCv daif -PAN -UAO)
	pc : snd_soc_find_dai+0xf8/0x100
	lr : snd_soc_find_dai+0xf4/0x100
	...
	Call trace:
	 snd_soc_find_dai+0xf8/0x100
	 snd_soc_dai_link_set_capabilities+0xa0/0x16c
	 graph_dai_link_of_dpcm+0x390/0x3c0
	 graph_for_each_link+0x134/0x200
	 graph_probe+0x144/0x230
	 platform_drv_probe+0x5c/0xb0
	 really_probe+0xe4/0x430
	 driver_probe_device+0x60/0xf4

snd_soc_find_dai() will be used from (X) CPU/Codec/Platform driver with
mutex lock, and (Y) Card driver without mutex lock.
This snd_soc_dai_link_set_capabilities() is for Card driver,
this means called without mutex.
This patch adds snd_soc_find_dai_with_mutex() to solve it.

Fixes: 25612477 ("ASoC: soc-dai: set dai_link dpcm_ flags with a helper")
Signed-off-by: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87blixvuab.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
parent d563b6c8
...@@ -1361,6 +1361,8 @@ void snd_soc_unregister_dai(struct snd_soc_dai *dai); ...@@ -1361,6 +1361,8 @@ void snd_soc_unregister_dai(struct snd_soc_dai *dai);
struct snd_soc_dai *snd_soc_find_dai( struct snd_soc_dai *snd_soc_find_dai(
const struct snd_soc_dai_link_component *dlc); const struct snd_soc_dai_link_component *dlc);
struct snd_soc_dai *snd_soc_find_dai_with_mutex(
const struct snd_soc_dai_link_component *dlc);
#include <sound/soc-dai.h> #include <sound/soc-dai.h>
......
...@@ -834,6 +834,19 @@ struct snd_soc_dai *snd_soc_find_dai( ...@@ -834,6 +834,19 @@ struct snd_soc_dai *snd_soc_find_dai(
} }
EXPORT_SYMBOL_GPL(snd_soc_find_dai); EXPORT_SYMBOL_GPL(snd_soc_find_dai);
struct snd_soc_dai *snd_soc_find_dai_with_mutex(
const struct snd_soc_dai_link_component *dlc)
{
struct snd_soc_dai *dai;
mutex_lock(&client_mutex);
dai = snd_soc_find_dai(dlc);
mutex_unlock(&client_mutex);
return dai;
}
EXPORT_SYMBOL_GPL(snd_soc_find_dai_with_mutex);
static int soc_dai_link_sanity_check(struct snd_soc_card *card, static int soc_dai_link_sanity_check(struct snd_soc_card *card,
struct snd_soc_dai_link *link) struct snd_soc_dai_link *link)
{ {
......
...@@ -412,14 +412,14 @@ void snd_soc_dai_link_set_capabilities(struct snd_soc_dai_link *dai_link) ...@@ -412,14 +412,14 @@ void snd_soc_dai_link_set_capabilities(struct snd_soc_dai_link *dai_link)
supported_codec = false; supported_codec = false;
for_each_link_cpus(dai_link, i, cpu) { for_each_link_cpus(dai_link, i, cpu) {
dai = snd_soc_find_dai(cpu); dai = snd_soc_find_dai_with_mutex(cpu);
if (dai && snd_soc_dai_stream_valid(dai, direction)) { if (dai && snd_soc_dai_stream_valid(dai, direction)) {
supported_cpu = true; supported_cpu = true;
break; break;
} }
} }
for_each_link_codecs(dai_link, i, codec) { for_each_link_codecs(dai_link, i, codec) {
dai = snd_soc_find_dai(codec); dai = snd_soc_find_dai_with_mutex(codec);
if (dai && snd_soc_dai_stream_valid(dai, direction)) { if (dai && snd_soc_dai_stream_valid(dai, direction)) {
supported_codec = true; supported_codec = true;
break; break;
......
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