diff --git a/lib/bitmap.c b/lib/bitmap.c
index a0b02974d898..8ee7d4857179 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -838,9 +838,12 @@ EXPORT_SYMBOL(bitmap_release_region);
  */
 int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order)
 {
+	unsigned int len = BIT(order);
+
 	if (!__reg_op(bitmap, pos, order, REG_OP_ISFREE))
 		return -EBUSY;
-	return __reg_op(bitmap, pos, order, REG_OP_ALLOC);
+	bitmap_set(bitmap, pos, len);
+	return 0;
 }
 EXPORT_SYMBOL(bitmap_allocate_region);