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ASoC: core: remove support for card rebind using component framework 

DRM based audio components get registered inside the component framework
bind callback. However component framework has a big mutex lock taken for
every call to component_add, component_del and bind, unbind callbacks.

This can lead to deadlock situation if we are trying to add new/remove
component within a bind/unbind callbacks. Which is what was happening
with bcm2837 rpi 3.

Revert this change till we sort out the mutex issue.

Reported-by: Guillaume Tucker <guillaume.tucker@collabora.com>
Reported-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Srinivas Kandagatla 2018-08-02 16:03:38 +01:00 committed by Mark Brown
parent 62121debfb
commit 611cbc8799
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GPG Key ID: 24D68B725D5487D0
2 changed files with 0 additions and 69 deletions
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7
include/sound/soc.h
View File

@ -17,7 +17,6 @@
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/component.h>
#include <linux/regmap.h>
#include <linux/log2.h>
#include <sound/core.h>
@ -1091,12 +1090,6 @@ struct snd_soc_card {
struct work_struct deferred_resume_work;
/* component framework related */
bool components_added;
/* set in machine driver to enable/disable auto re-binding */
bool auto_bind;
struct component_match *match;
/* lists of probed devices belonging to this card */
struct list_head component_dev_list;

62
sound/soc/soc-core.c
View File

@ -279,28 +279,11 @@ static inline void snd_soc_debugfs_exit(void)
#endif
static int snd_soc_card_comp_compare(struct device *dev, void *data)
{
struct snd_soc_component *component;
lockdep_assert_held(&client_mutex);
list_for_each_entry(component, &component_list, list) {
if (dev == component->dev) {
if (!strcmp(component->name, data))
return 1;
break;
}
}
return 0;
}
static int snd_soc_rtdcom_add(struct snd_soc_pcm_runtime *rtd,
struct snd_soc_component *component)
{
struct snd_soc_rtdcom_list *rtdcom;
struct snd_soc_rtdcom_list *new_rtdcom;
char *cname;
for_each_rtdcom(rtd, rtdcom) {
/* already connected */
@ -317,13 +300,6 @@ static int snd_soc_rtdcom_add(struct snd_soc_pcm_runtime *rtd,
list_add_tail(&new_rtdcom->list, &rtd->component_list);
if (rtd->card->auto_bind && !rtd->card->components_added) {
cname = devm_kasprintf(rtd->card->dev, GFP_KERNEL,
"%s", component->name);
component_match_add(rtd->card->dev, &rtd->card->match,
snd_soc_card_comp_compare, cname);
}
return 0;
}
@ -859,25 +835,6 @@ static bool soc_is_dai_link_bound(struct snd_soc_card *card,
return false;
}
static int snd_soc_card_comp_bind(struct device *dev)
{
struct snd_soc_card *card = dev_get_drvdata(dev);
if (card->instantiated)
return 0;
return snd_soc_register_card(card);
}
static void snd_soc_card_comp_unbind(struct device *dev)
{
}
static const struct component_master_ops snd_soc_card_comp_ops = {
.bind = snd_soc_card_comp_bind,
.unbind = snd_soc_card_comp_unbind,
};
static int soc_bind_dai_link(struct snd_soc_card *card,
struct snd_soc_dai_link *dai_link)
{
@ -2169,12 +2126,6 @@ static int snd_soc_instantiate_card(struct snd_soc_card *card)
card->instantiated = 1;
snd_soc_dapm_sync(&card->dapm);
if (card->auto_bind && !card->components_added) {
component_master_add_with_match(card->dev,
&snd_soc_card_comp_ops,
card->match);
card->components_added = true;
}
mutex_unlock(&card->mutex);
mutex_unlock(&client_mutex);
@ -2820,9 +2771,6 @@ int snd_soc_unregister_card(struct snd_soc_card *card)
dev_dbg(card->dev, "ASoC: Unregistered card '%s'\n", card->name);
}
if (!card->auto_bind && card->components_added)
component_master_del(card->dev, &snd_soc_card_comp_ops);
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_unregister_card);
@ -3235,17 +3183,8 @@ int snd_soc_add_component(struct device *dev,
snd_soc_component_add(component);
ret = component_add(dev, NULL);
if (ret < 0) {
dev_err(dev, "ASoC: Failed to add Component: %d\n", ret);
goto err_comp;
}
return 0;
err_comp:
soc_remove_component(component);
snd_soc_unregister_dais(component);
err_cleanup:
snd_soc_component_cleanup(component);
err_free:
@ -3293,7 +3232,6 @@ static int __snd_soc_unregister_component(struct device *dev)
mutex_unlock(&client_mutex);
if (found) {
component_del(dev, NULL);
snd_soc_component_cleanup(component);
}