Commit a6ba2dad authored by Heiko Stuebner's avatar Heiko Stuebner
Browse files

drivers: base: component: add function to query the bound status 



The component helpers already expose the bound status in debugfs, but at
times it might be necessary to also check that state in the kernel and
act differently depending on the result.

For example the shutdown handler of a drm-driver might need to stop
a whole output pipeline if the drm device is up and running, but may
run into problems if that drm-device has never been set up before,
for example because the binding deferred.

So add a little helper that returns the bound status for a componet
device.

Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20250220234141.2788785-2-heiko@sntech.de
parent b06d1ef3

drivers/base/component.c

+14 −0
Original line number Diff line number Diff line
@@ -569,6 +569,20 @@ void component_master_del(struct device *parent, 
}

EXPORT_SYMBOL_GPL(component_master_del);



bool component_master_is_bound(struct device *parent,

	const struct component_master_ops *ops)

{

	struct aggregate_device *adev;



	guard(mutex)(&component_mutex);

	adev = __aggregate_find(parent, ops);

	if (!adev)

		return 0;



	return adev->bound;

}

EXPORT_SYMBOL_GPL(component_master_is_bound);



static void component_unbind(struct component *component,

	struct aggregate_device *adev, void *data)

{

include/linux/component.h

+3 −1
Original line number Diff line number Diff line
@@ -3,7 +3,7 @@ 
#define COMPONENT_H



#include <linux/stddef.h>



#include <linux/types.h>



struct device;
@@ -90,6 +90,8 @@ int component_compare_dev_name(struct device *dev, void *data); 


void component_master_del(struct device *,

	const struct component_master_ops *);

bool component_master_is_bound(struct device *parent,

	const struct component_master_ops *ops);



struct component_match;