From 1b7c12316982f74a5b8e7704c24cf5524d0723a3 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Wed, 8 Jul 2015 20:47:43 +0200 Subject: [PATCH] ASoC: Prevent components from being bound to multiple cards A component can only be bound to a single card at a time. Binding it to card while it is already bound to another will result in undefined behavior. As the undefined behavior might only manifest itself later on it is not necessarily always straight forward to find the cause. To prevent this add a check that refuses to bind a component to multiple cards as well as prints a error describing the problem. Signed-off-by: Lars-Peter Clausen Signed-off-by: Mark Brown --- sound/soc/soc-core.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 6ce621749f8d..96bb71aea529 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -1102,9 +1102,19 @@ static int soc_probe_component(struct snd_soc_card *card, struct snd_soc_dai *dai; int ret; - if (!strcmp(component->name, "snd-soc-dummy") || component->probed) + if (!strcmp(component->name, "snd-soc-dummy")) return 0; + if (component->probed) { + if (component->card != card) { + dev_err(component->dev, + "Trying to bind component to card \"%s\" but is already bound to card \"%s\"\n", + card->name, component->card->name); + return -ENODEV; + } + return 0; + } + component->card = card; dapm->card = card; soc_set_name_prefix(card, component); -- GitLab