[PATCH v5 2/3] Boot var automatic management for removable medias

[Raymond Mao]

Changes for complying to EFI spec §3.5.1.1
'Removable Media Boot Behavior'.
Boot variables can be automatically generated during a removable
media is probed. At the same time, unused boot variables will be
detected and removed.

Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
---
Changes in v2
- Ignore EFI_NOT_FOUND returned from
  efi_bootmgr_update_media_device_boot_option which means no boot
  options scanned.
Changes in v3
- Split the patch into moving and renaming functions and
  individual patches for each changed functionality
Changes in v4
- Revert the change of introducing a bool parameter when updating
  the boot option. Use short-form of device path by default
Changes in v5
- Move function call of efi_bootmgr_update_media_device_boot_option()
  from efi_init_variables() to efi_init_obj_list()
- Add warning log when a short-form device path doesn't exist

 lib/efi_loader/efi_disk.c     | 7 +++++++
 lib/efi_loader/efi_setup.c    | 5 +++++
 lib/efi_loader/efi_variable.c | 1 -
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index d2256713a8..ca5f07f2ec 100644
--- a/lib/efi_loader/efi_disk.c
+++ b/lib/efi_loader/efi_disk.c
@@ -687,6 +687,13 @@ int efi_disk_probe(void *ctx, struct event *event)
 			return -1;
 	}
 
+	/* only do the boot option management when UEFI sub-system is initialized */
+	if (efi_obj_list_initialized == EFI_SUCCESS) {
+		ret = efi_bootmgr_update_media_device_boot_option();
+		if (ret != EFI_SUCCESS && ret != EFI_NOT_FOUND)
+			return -1;
+	}
+
 	return 0;
 }
 
diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index 58d4e13402..4686374995 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -245,6 +245,11 @@ efi_status_t efi_init_obj_list(void)
 	if (ret != EFI_SUCCESS)
 		goto out;
 
+	/* update boot option after variable service initialized */
+	ret = efi_bootmgr_update_media_device_boot_option();
+	if (ret != EFI_SUCCESS && ret != EFI_NOT_FOUND)
+		goto out;
+
 	/* Define supported languages */
 	ret = efi_init_platform_lang();
 	if (ret != EFI_SUCCESS)
diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index be95ed44e6..1529fffd1d 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -476,6 +476,5 @@ efi_status_t efi_init_variables(void)
 			log_err("Invalid EFI variable seed\n");
 	}
 
-
 	return efi_init_secure_state();
 }
-- 
2.25.1