Remove 'recurse into child resources' logic from 'reserve_region_with_split()'
This function is not actually used right now, since the original use
case for it was done with insert_resource_expand_to_fit() instead.
However, we now have another usage case that wants to basically do a
"reserve IO resource, splitting around existing resources", however that
one doesn't actually want the "recurse into the conflicting resource"
logic at all.
And since recursing into the conflicting resource was the most complex
part, and isn't wanted, just remove it. Maybe we'll some day want both
versions, but we can just resurrect the logic then.
Tested-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/resource.c b/kernel/resource.c
index fd5d7d5..ac5f3a3 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -533,43 +533,21 @@
res->end = end;
res->flags = IORESOURCE_BUSY;
- for (;;) {
- conflict = __request_resource(parent, res);
- if (!conflict)
- break;
- if (conflict != parent) {
- parent = conflict;
- if (!(conflict->flags & IORESOURCE_BUSY))
- continue;
- }
+ conflict = __request_resource(parent, res);
+ if (!conflict)
+ return;
- /* Uhhuh, that didn't work out.. */
- kfree(res);
- res = NULL;
- break;
- }
+ /* failed, split and try again */
+ kfree(res);
- if (!res) {
- /* failed, split and try again */
+ /* conflict covered whole area */
+ if (conflict->start <= start && conflict->end >= end)
+ return;
- /* conflict covered whole area */
- if (conflict->start <= start && conflict->end >= end)
- return;
-
- if (conflict->start > start)
- __reserve_region_with_split(root, start, conflict->start-1, name);
- if (!(conflict->flags & IORESOURCE_BUSY)) {
- resource_size_t common_start, common_end;
-
- common_start = max(conflict->start, start);
- common_end = min(conflict->end, end);
- if (common_start < common_end)
- __reserve_region_with_split(root, common_start, common_end, name);
- }
- if (conflict->end < end)
- __reserve_region_with_split(root, conflict->end+1, end, name);
- }
-
+ if (conflict->start > start)
+ __reserve_region_with_split(root, start, conflict->start-1, name);
+ if (conflict->end < end)
+ __reserve_region_with_split(root, conflict->end+1, end, name);
}
void __init reserve_region_with_split(struct resource *root,
