diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 8bfb0b327267b461a5bb41cc5befe385f9637824..f794089d30ac21de22894774f13d4d2871213573 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -170,7 +170,7 @@ struct drm_mm_node *
 __drm_mm_interval_first(const struct drm_mm *mm, u64 start, u64 last)
 {
 	return drm_mm_interval_tree_iter_first((struct rb_root *)&mm->interval_tree,
-					       start, last);
+					       start, last) ?: (struct drm_mm_node *)&mm->head_node;
 }
 EXPORT_SYMBOL(__drm_mm_interval_first);
 
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index 1e71bc182ca96a6bda444650f3f30db15ce95df8..2958f596081ee819399e6c1d068648c7ba154657 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -839,16 +839,18 @@ static bool assert_contiguous_in_range(struct drm_mm *mm,
 		n++;
 	}
 
-	drm_mm_for_each_node_in_range(node, mm, 0, start) {
-		if (node) {
+	if (start > 0) {
+		node = __drm_mm_interval_first(mm, 0, start - 1);
+		if (node->allocated) {
 			pr_err("node before start: node=%llx+%llu, start=%llx\n",
 			       node->start, node->size, start);
 			return false;
 		}
 	}
 
-	drm_mm_for_each_node_in_range(node, mm, end, U64_MAX) {
-		if (node) {
+	if (end < U64_MAX) {
+		node = __drm_mm_interval_first(mm, end, U64_MAX);
+		if (node->allocated) {
 			pr_err("node after end: node=%llx+%llu, end=%llx\n",
 			       node->start, node->size, end);
 			return false;
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index d81b0ba9921fb5d855c28ed672e0352a856214c9..f262da18011723b1f504321838d575a7274822be 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -459,10 +459,13 @@ __drm_mm_interval_first(const struct drm_mm *mm, u64 start, u64 last);
  * but using the internal interval tree to accelerate the search for the
  * starting node, and so not safe against removal of elements. It assumes
  * that @end is within (or is the upper limit of) the drm_mm allocator.
+ * If [@start, @end] are beyond the range of the drm_mm, the iterator may walk
+ * over the special _unallocated_ &drm_mm.head_node, and may even continue
+ * indefinitely.
  */
 #define drm_mm_for_each_node_in_range(node__, mm__, start__, end__)	\
 	for (node__ = __drm_mm_interval_first((mm__), (start__), (end__)-1); \
-	     node__ && node__->start < (end__);				\
+	     node__->start < (end__);					\
 	     node__ = list_next_entry(node__, node_list))
 
 void drm_mm_scan_init_with_range(struct drm_mm_scan *scan,