The efivars filesystem depends on GetVariable or GetNextVariable EFI
runtime services. So the /sys/firmware/efi/efivars does not need to be
created when GetVariable and GetNextVariable are not available.
It is useful for userland to determine the availability of efivars
filesystem.
Cc: Ilias Apalodimas <ilias.apalodimas@xxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Signed-off-by: "Lee, Chun-Yi" <jlee@xxxxxxxx>
---
drivers/firmware/efi/efi.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index fdd1db025dbf..929fbf4dfd5d 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -404,11 +404,14 @@ static int __init efisubsys_init(void)
if (error)
goto err_remove_group;
- /* and the standard mountpoint for efivarfs */
- error = sysfs_create_mount_point(efi_kobj, "efivars");
- if (error) {
- pr_err("efivars: Subsystem registration failed.\n");
- goto err_remove_group;
+ if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
+ EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) {
+ /* and the standard mountpoint for efivarfs */
+ error = sysfs_create_mount_point(efi_kobj, "efivars");
+ if (error) {
+ pr_err("efivars: Subsystem registration failed.\n");
+ goto err_remove_group;
+ }
}
if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS))
--
2.16.4
