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resource: add __adjust_resource() for internal use

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Add __adjust_resource(), which is called by adjust_resource() internally
after the resource_lock is held.  There is no interface change to
adjust_resource().  This change allows other functions to call
__adjust_resource() internally while the resource_lock is held.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: T Makphaibulchoke <tmac@hp.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Toshi Kani 2013-04-29 15:08:17 -07:00 • committed by Linus Torvalds
parent c73e5c9c59
commit ae8e3a915a
1 changed files with 22 additions and 13 deletions
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35
kernel/resource.c
View file

@ -706,24 +706,13 @@ void insert_resource_expand_to_fit(struct resource *root, struct resource *new)
write_unlock(&resource_lock); write_unlock(&resource_lock);
} }
/** static int __adjust_resource(struct resource *res, resource_size_t start,
* adjust_resource - modify a resource's start and size resource_size_t size)
* @res: resource to modify
* @start: new start value
* @size: new size
*
* Given an existing resource, change its start and size to match the
* arguments. Returns 0 on success, -EBUSY if it can't fit.
* Existing children of the resource are assumed to be immutable.
*/
int adjust_resource(struct resource *res, resource_size_t start, resource_size_t size)
{ {
struct resource *tmp, *parent = res->parent; struct resource *tmp, *parent = res->parent;
resource_size_t end = start + size - 1; resource_size_t end = start + size - 1;
int result = -EBUSY; int result = -EBUSY;
write_lock(&resource_lock);
if (!parent) if (!parent)
goto skip; goto skip;
@ -751,6 +740,26 @@ skip:
result = 0; result = 0;
out: out:
return result;
}
/**
* adjust_resource - modify a resource's start and size
* @res: resource to modify
* @start: new start value
* @size: new size
*
* Given an existing resource, change its start and size to match the
* arguments. Returns 0 on success, -EBUSY if it can't fit.
* Existing children of the resource are assumed to be immutable.
*/
int adjust_resource(struct resource *res, resource_size_t start,
resource_size_t size)
{
int result;
write_lock(&resource_lock);
result = __adjust_resource(res, start, size);
write_unlock(&resource_lock); write_unlock(&resource_lock);
return result; return result;
} }