diff --git a/kernel/memremap.c b/kernel/memremap.c
index 4ef9752..4849be5 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -241,13 +241,16 @@ int device_private_entry_fault(struct vm_area_struct *vma,
 EXPORT_SYMBOL(device_private_entry_fault);
 #endif /* CONFIG_DEVICE_PRIVATE */
 
-static void pgmap_radix_release(struct resource *res)
+static void pgmap_radix_release(struct resource *res, unsigned long end_pgoff)
 {
 	unsigned long pgoff, order;
 
 	mutex_lock(&pgmap_lock);
-	foreach_order_pgoff(res, order, pgoff)
+	foreach_order_pgoff(res, order, pgoff) {
+		if (pgoff >= end_pgoff)
+			break;
 		radix_tree_delete(&pgmap_radix, PHYS_PFN(res->start) + pgoff);
+	}
 	mutex_unlock(&pgmap_lock);
 
 	synchronize_rcu();
@@ -302,7 +305,7 @@ static void devm_memremap_pages_release(void *data)
 	mem_hotplug_done();
 
 	untrack_pfn(NULL, PHYS_PFN(align_start), align_size);
-	pgmap_radix_release(res);
+	pgmap_radix_release(res, -1);
 	dev_WARN_ONCE(dev, pgmap->altmap.alloc,
 		      "%s: failed to free all reserved pages\n", __func__);
 }
@@ -418,7 +421,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
 	untrack_pfn(NULL, PHYS_PFN(align_start), align_size);
  err_pfn_remap:
  err_radix:
-	pgmap_radix_release(res);
+	pgmap_radix_release(res, pgoff);
 	devres_free(pgmap);
 	return ERR_PTR(error);
 }