efi_loader: simplify efi_uninstall_protocol_interface

Use function efi_search_obj, efi_search_protocol and
efi_remove_protocol to simplify the coding.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

lib/efi_loader/efi_boottime.c

@@ -906,9 +906,8 @@ static efi_status_t EFIAPI efi_uninstall_protocol_interface(
 				void *handle, const efi_guid_t *protocol,
 				void *protocol_interface)
 {
-	struct list_head *lhandle;
-	int i;
-	efi_status_t r = EFI_NOT_FOUND;
+	struct efi_handler *handler;
+	efi_status_t r;
 
 	EFI_ENTRY("%p, %pUl, %p", handle, protocol, protocol_interface);
 
@@ -917,31 +916,16 @@ static efi_status_t EFIAPI efi_uninstall_protocol_interface(
 		goto out;
 	}
 
-	list_for_each(lhandle, &efi_obj_list) {
-		struct efi_object *efiobj;
-		efiobj = list_entry(lhandle, struct efi_object, link);
-
-		if (efiobj->handle != handle)
-			continue;
-
-		for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
-			struct efi_handler *handler = &efiobj->protocols[i];
-			const efi_guid_t *hprotocol = handler->guid;
-
-			if (!hprotocol)
-				continue;
-			if (!guidcmp(hprotocol, protocol)) {
+	/* Find the protocol on the handle */
+	r = efi_search_protocol(handle, protocol, &handler);
+	if (r != EFI_SUCCESS)
+		goto out;
 	if (handler->protocol_interface) {
+		/* TODO disconnect controllers */
 		r =  EFI_ACCESS_DENIED;
 	} else {
-					handler->guid = 0;
-					r = EFI_SUCCESS;
-				}
-				goto out;
+		r = efi_remove_protocol(handle, protocol, protocol_interface);
 	}
-		}
-	}
-
 out:
 	return EFI_EXIT(r);
 }