// SPDX-License-Identifier: GPL-2.0/* * KUnit resource API for test managed resources (allocations, etc.). * * Copyright (C) 2022, Google LLC. * Author: Daniel Latypov <dlatypov@google.com> */ #include <kunit/resource.h>#include <kunit/test.h>#include <linux/kref.h> /* * Used for static resources and when a kunit_resource * has been created by * kunit_alloc_resource().  When an init function is supplied, @data is passed * into the init function; otherwise, we simply set the resource data field to * the data value passed in. Doesn't initialize res->should_kfree. */int __kunit_add_resource(struct kunit *test,			 kunit_resource_init_t init,			 kunit_resource_free_t free,			 struct kunit_resource *res,			 void *data){	int ret = 0;	unsigned long flags; 	res->free = free;	kref_init(&res->refcount); 	if (init) {		ret = init(res, data);		if (ret)			return ret;	} else {		res->data = data;	} 	spin_lock_irqsave(&test->lock, flags);	list_add_tail(&res->node, &test->resources);	/* refcount for list is established by kref_init() */	spin_unlock_irqrestore(&test->lock, flags); 	return ret;}EXPORT_SYMBOL_GPL(__kunit_add_resource); void kunit_remove_resource(struct kunit *test, struct kunit_resource *res){	unsigned long flags;	bool was_linked; 	spin_lock_irqsave(&test->lock, flags);	was_linked = !list_empty(&res->node);	list_del_init(&res->node);	spin_unlock_irqrestore(&test->lock, flags); 	if (was_linked)		kunit_put_resource(res);}EXPORT_SYMBOL_GPL(kunit_remove_resource); int kunit_destroy_resource(struct kunit *test, kunit_resource_match_t match,			   void *match_data){	struct kunit_resource *res = kunit_find_resource(test, match,							 match_data); 	if (!res)		return -ENOENT; 	kunit_remove_resource(test, res); 	/* We have a reference also via _find(); drop it. */	kunit_put_resource(res); 	return 0;}EXPORT_SYMBOL_GPL(kunit_destroy_resource);