diff --git a/kernel/resource.c b/kernel/resource.c
index 100253d49..1087f33d7 100755
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -539,21 +539,63 @@ EXPORT_SYMBOL_GPL(page_is_ram);
 int region_intersects(resource_size_t start, size_t size, unsigned long flags,
 		      unsigned long desc)
 {
-	struct resource res;
+	resource_size_t ostart, oend;
 	int type = 0; int other = 0;
-	struct resource *p;
+	struct resource *p, *dp;
+	bool is_type, covered;
+	struct resource res;
 
 	res.start = start;
 	res.end = start + size - 1;
 
 	read_lock(&resource_lock);
 	for (p = iomem_resource.child; p ; p = p->sibling) {
-		bool is_type = (((p->flags & flags) == flags) &&
-				((desc == IORES_DESC_NONE) ||
-				 (desc == p->desc)));
-
-		if (resource_overlaps(p, &res))
-			is_type ? type++ : other++;
+		if (!resource_overlaps(p, &res))
+			continue;
+		is_type = (p->flags & flags) == flags &&
+			(desc == IORES_DESC_NONE || desc == p->desc);
+		if (is_type) {
+			type++;
+			continue;
+		}
+		/*
+		 * Continue to search in descendant resources as if the
+		 * matched descendant resources cover some ranges of 'p'.
+		 *
+		 * |------------- "CXL Window 0" ------------|
+		 * |-- "System RAM" --|
+		 *
+		 * will behave similar as the following fake resource
+		 * tree when searching "System RAM".
+		 *
+		 * |-- "System RAM" --||-- "CXL Window 0a" --|
+		 */
+		covered = false;
+		ostart = max(res.start, p->start);
+		oend = min(res.end, p->end);
+		for (dp = p->child; dp; dp = next_resource(dp, false)) {
+			if (!resource_overlaps(dp, &res))
+				continue;
+			is_type = (dp->flags & flags) == flags &&
+				(desc == IORES_DESC_NONE || desc == dp->desc);
+			if (is_type) {
+				type++;
+				/*
+				 * Range from 'ostart' to 'dp->start'
+				 * isn't covered by matched resource.
+				 */
+				if (dp->start > ostart)
+					break;
+				if (dp->end >= oend) {
+					covered = true;
+					break;
+				}
+				/* Remove covered range */
+				ostart = max(ostart, dp->end + 1);
+			}
+		}
+		if (!covered)
+			other++;
 	}
 	read_unlock(&resource_lock);