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 <[email protected]> Cc: Ard Biesheuvel <[email protected]> Signed-off-by: "Lee, Chun-Yi" <[email protected]> --- 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
