diff --git a/include/efi_loader.h b/include/efi_loader.h
index 46d684f6df8d21c7b4002f87faf468c3f47aed00..f27192555e55be977f752086ab5f7f15741bd167 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -42,9 +42,22 @@ const char *__efi_nesting_dec(void);
 	})
 
 /*
- * Callback into UEFI world from u-boot:
+ * Call non-void UEFI function from u-boot and retrieve return value:
  */
-#define EFI_CALL(exp) do { \
+#define EFI_CALL(exp) ({ \
+	debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
+	assert(__efi_exit_check()); \
+	typeof(exp) _r = exp; \
+	assert(__efi_entry_check()); \
+	debug("%sEFI: %lu returned by %s\n", __efi_nesting_dec(), \
+	      (unsigned long)((uintptr_t)_r & ~EFI_ERROR_MASK), #exp); \
+	_r; \
+})
+
+/*
+ * Call void UEFI function from u-boot:
+ */
+#define EFI_CALL_VOID(exp) do { \
 	debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
 	assert(__efi_exit_check()); \
 	exp; \
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 90e9ead7b25ec4403387560acb39fcda57e1d264..2c9379a8ae51c9ce62c723ec3fe343ae04f927b5 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -163,7 +163,8 @@ void efi_signal_event(struct efi_event *event)
 		return;
 	event->signaled = 1;
 	if (event->type & EVT_NOTIFY_SIGNAL) {
-		EFI_CALL(event->notify_function(event, event->notify_context));
+		EFI_CALL_VOID(event->notify_function(event,
+						     event->notify_context));
 	}
 }