The patch
ASoC: core: remove support for card rebind using component framework
has been applied to the asoc tree at
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
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Thanks, Mark
From 611cbc8799b672f41b6ba7afed758ad9efb959a7 Mon Sep 17 00:00:00 2001
From: Srinivas Kandagatla srinivas.kandagatla@linaro.org Date: Thu, 2 Aug 2018 16:03:38 +0100 Subject: [PATCH] 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 --- include/sound/soc.h | 7 ----- sound/soc/soc-core.c | 62 -------------------------------------------- 2 files changed, 69 deletions(-)
diff --git a/include/sound/soc.h b/include/sound/soc.h index ace474e8649e..41cec42fb456 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -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;
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 81b27923303d..82eb3868be67 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -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); }