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[2/2] ALSA: hda - identify when audio is provided by a video driver

Message ID 5c3a968858a05c27e299eadf2a925d4aa91ac17a.1651212016.git.mchehab@kernel.org
State New
Headers show
Series Let userspace know when snd-hda-intel needs i915 | expand

Commit Message

Mauro Carvalho Chehab April 29, 2022, 6:31 a.m. UTC
On some devices, the hda driver needs to hook into a video driver,
in order to be able to properly access the audio hardware and/or
the power management function.

That's the case of several snd_hda_intel devices that depends on
i915 driver.

Currently, this dependency is hidden from /proc/modules and
from lsmod, making harder to identify the need to unbind the
audio driver before being able to unbind the i915 driver.

Add a reference for it at the module dependency, in order to
allow userspace to identify it, and print a message on such

Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

See [PATCH 0/2] at: https://lore.kernel.org/all/cover.1651212016.git.mchehab@kernel.org/

 sound/hda/hdac_component.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series


diff --git a/sound/hda/hdac_component.c b/sound/hda/hdac_component.c
index bb37e7e0bd79..103c6be8be1e 100644
--- a/sound/hda/hdac_component.c
+++ b/sound/hda/hdac_component.c
@@ -211,6 +211,14 @@  static int hdac_component_master_bind(struct device *dev)
+	if (acomp->ops->owner && acomp->ops->owner->name) {
+		dev_info(dev, "audio component provided by %s driver\n",
+			 acomp->ops->owner->name);
+		module_add_named_dependency(acomp->ops->owner->name,
+					    dev->driver->owner);
+	}
 	return 0;