efi_loader: check initialization of EFI subsystem is successful

Up to now errors in the initialization of the EFI subsystems was not
checked.

If any initialization fails, leave the bootefi command.

We do not retry initialization because this would require to undo all prior
initalization steps.

Suggested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

cmd/bootefi.c

@@ -22,40 +22,65 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-static u8 efi_obj_list_initialized;
+#define OBJ_LIST_NOT_INITIALIZED 1
+
+static efi_status_t efi_obj_list_initialized = OBJ_LIST_NOT_INITIALIZED;
 
 static struct efi_device_path *bootefi_image_path;
 static struct efi_device_path *bootefi_device_path;
 
 /* Initialize and populate EFI object list */
-static void efi_init_obj_list(void)
+efi_status_t efi_init_obj_list(void)
 {
+	efi_status_t ret = EFI_SUCCESS;
+
 	/* Initialize once only */
-	if (efi_obj_list_initialized)
-		return;
-	efi_obj_list_initialized = 1;
+	if (efi_obj_list_initialized != OBJ_LIST_NOT_INITIALIZED)
+		return efi_obj_list_initialized;
 
 	/* Initialize EFI driver uclass */
-	efi_driver_init();
+	ret = efi_driver_init();
+	if (ret != EFI_SUCCESS)
+		goto out;
 
-	efi_console_register();
+	ret = efi_console_register();
+	if (ret != EFI_SUCCESS)
+		goto out;
 #ifdef CONFIG_PARTITIONS
-	efi_disk_register();
+	ret = efi_disk_register();
+	if (ret != EFI_SUCCESS)
+		goto out;
 #endif
 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
-	efi_gop_register();
+	ret = efi_gop_register();
+	if (ret != EFI_SUCCESS)
+		goto out;
 #endif
 #ifdef CONFIG_CMD_NET
-	efi_net_register();
+	ret = efi_net_register();
+	if (ret != EFI_SUCCESS)
+		goto out;
 #endif
 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
-	efi_smbios_register();
+	ret = efi_smbios_register();
+	if (ret != EFI_SUCCESS)
+		goto out;
 #endif
-	efi_watchdog_register();
+	ret = efi_watchdog_register();
+	if (ret != EFI_SUCCESS)
+		goto out;
 
 	/* Initialize EFI runtime services */
-	efi_reset_system_init();
-	efi_get_time_init();
+	ret = efi_reset_system_init();
+	if (ret != EFI_SUCCESS)
+		goto out;
+	ret = efi_get_time_init();
+	if (ret != EFI_SUCCESS)
+		goto out;
+
+out:
+	efi_obj_list_initialized = ret;
+	return ret;
 }
 
 /*
@@ -186,9 +211,6 @@ static efi_status_t do_bootefi_exec(void *efi, void *fdt,
 		assert(device_path && image_path);
 	}
 
-	/* Initialize and populate EFI object list */
-	efi_init_obj_list();
-
 	efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj,
 			       device_path, image_path);
 
@@ -285,9 +307,6 @@ static int do_bootefi_bootmgr_exec(unsigned long fdt_addr)
 	void *addr;
 	efi_status_t r;
 
-	/* Initialize and populate EFI object list */
-	efi_init_obj_list();
-
 	/*
 	 * gd lives in a fixed register which may get clobbered while we execute
 	 * the payload. So save it here and restore it on every callback entry
@@ -316,6 +335,14 @@ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	unsigned long addr, fdt_addr = 0;
 	efi_status_t r;
 
+	/* Initialize EFI drivers */
+	r = efi_init_obj_list();
+	if (r != EFI_SUCCESS) {
+		printf("Error: Cannot set up EFI drivers, r = %lu\n",
+		       r & ~EFI_ERROR_MASK);
+		return CMD_RET_FAILURE;
+	}
+
 	if (argc < 2)
 		return CMD_RET_USAGE;
 #ifdef CONFIG_CMD_BOOTEFI_HELLO