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-rw-r--r--kernel/resource.c46
1 files changed, 12 insertions, 34 deletions
diff --git a/kernel/resource.c b/kernel/resource.c
index fd5d7d574bb..ac5f3a36923 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -533,43 +533,21 @@ static void __init __reserve_region_with_split(struct resource *root,
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;
- }
-
- /* Uhhuh, that didn't work out.. */
- kfree(res);
- res = NULL;
- break;
- }
-
- if (!res) {
- /* failed, split and try again */
-
- /* conflict covered whole area */
- if (conflict->start <= start && conflict->end >= end)
- return;
+ conflict = __request_resource(parent, res);
+ if (!conflict)
+ 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;
+ /* failed, split and try again */
+ kfree(res);
- 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);
- }
+ /* 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->end < end)
+ __reserve_region_with_split(root, conflict->end+1, end, name);
}
void __init reserve_region_with_split(struct resource *root,