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Commit 5eeec0ec authored by Yinghai Lu's avatar Yinghai Lu Committed by Jesse Barnes
Browse files

resource: add release_child_resources 



Useful for freeing a portion of the resource tree, e.g. when trying to
reallocate resources more efficiently.

Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 7cc5997d

include/linux/ioport.h

+1 −0
Original line number Diff line number Diff line
@@ -112,6 +112,7 @@ extern struct resource iomem_resource; 


extern int request_resource(struct resource *root, struct resource *new);

extern int release_resource(struct resource *new);

void release_child_resources(struct resource *new);

extern void reserve_region_with_split(struct resource *root,

			     resource_size_t start, resource_size_t end,

			     const char *name);

kernel/resource.c

+30 −0
Original line number Diff line number Diff line
@@ -188,6 +188,36 @@ static int __release_resource(struct resource *old) 
	return -EINVAL;

}



static void __release_child_resources(struct resource *r)

{

	struct resource *tmp, *p;

	resource_size_t size;



	p = r->child;

	r->child = NULL;

	while (p) {

		tmp = p;

		p = p->sibling;



		tmp->parent = NULL;

		tmp->sibling = NULL;

		__release_child_resources(tmp);



		printk(KERN_DEBUG "release child resource %pR\n", tmp);

		/* need to restore size, and keep flags */

		size = resource_size(tmp);

		tmp->start = 0;

		tmp->end = size - 1;

	}

}



void release_child_resources(struct resource *r)

{

	write_lock(&resource_lock);

	__release_child_resources(r);

	write_unlock(&resource_lock);

}



/**

 * request_resource - request and reserve an I/O or memory resource

 * @root: root resource descriptor