On Fri 14 Feb 2020 at 21:56, Mark Brown broonie@kernel.org wrote:
The patch
ASoC: core: ensure component names are unique
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
Hi Mark,
Short Version: After looking at the problem reported by Marek, I think the best course of action for now is to revert b2354e4009a7 ("ASoC: core: ensure component names are unique") while working on a solution. It might take some time.
Longer Version:
1) Multiple components : I found out that in fact it is common for linux devices to register multiple components. For most, it is a combination of the dmaengine generic and the actual device component, but other register more component. Ex: - vc4-hdmi - atmel-classd - atmel-pdmic - cros-ec-codec - mtXXXX-afe-pcm I suspect these trigger the debugfs warning Even dummy register two components :D
All devices using devm_snd_dmaengine_pcm_register() and devm_snd_soc_register_component() are exposed to clean-up issue in case of deferral. That's because snd_soc_unregister_component() unregisters all the components registered the device. I suppose there might be other problems when using the devm API with this function.
2) Fixed component names: Several card driver assume the component name is the device name and won't query the actual component name or node. Ex: - sun4i-codec - omap-hdmi - vc4-hdmi - sof-nocodec
So changing the way ASoC generate the component names might break these cards. It gets tricky because the same cards driver might register multiple component themselves, like vc4-hdmi.
From b2354e4009a773c00054b964d937e1b81cb92078 Mon Sep 17 00:00:00 2001 From: Jerome Brunet jbrunet@baylibre.com Date: Fri, 14 Feb 2020 14:47:04 +0100 Subject: [PATCH] ASoC: core: ensure component names are unique
Make sure each ASoC component is registered with a unique name. The component is derived from the device name. If a device registers more than one component, the component names will be the same.
This usually brings up a warning about the debugfs directory creation of the component since directory already exists.
In such case, start numbering the component of the device so the names don't collide anymore.
Signed-off-by: Jerome Brunet jbrunet@baylibre.com Link: https://lore.kernel.org/r/20200214134704.342501-1-jbrunet@baylibre.com Signed-off-by: Mark Brown broonie@kernel.org
sound/soc/soc-core.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 03b87427faa7..6a58a8f6e3c4 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -2446,6 +2446,33 @@ static int snd_soc_register_dais(struct snd_soc_component *component, return ret; }
+static char *snd_soc_component_unique_name(struct device *dev,
struct snd_soc_component *component)+{
- struct snd_soc_component *pos;
- int count = 0;
- char *name, *unique;
- name = fmt_single_name(dev, &component->id);
- if (!name)
return name;- /* Count the number of components registred by the device */
- for_each_component(pos) {
if (dev == pos->dev)count++;- }
- /* Keep naming as it is for the 1st component */
- if (!count)
return name;- unique = devm_kasprintf(dev, GFP_KERNEL, "%s-%d", name, count);
- devm_kfree(dev, name);
- return unique;
+}
static int snd_soc_component_initialize(struct snd_soc_component *component, const struct snd_soc_component_driver *driver, struct device *dev) { @@ -2454,7 +2481,7 @@ static int snd_soc_component_initialize(struct snd_soc_component *component, INIT_LIST_HEAD(&component->card_list); mutex_init(&component->io_mutex);
- component->name = fmt_single_name(dev, &component->id);
- component->name = snd_soc_component_unique_name(dev, component); if (!component->name) { dev_err(dev, "ASoC: Failed to allocate name\n"); return -ENOMEM;