efi: add efivars kobject to efi sysfs folder

UEFI variable filesystem need a new mount point, so this patch add
efivars kobject to efi_kobj for create a /sys/firmware/efi/efivars
folder.

Cc: Matthew Garrett <mjg@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Lee, Chun-Yi <jlee@suse.com>
Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index d7658b4a5010..6793965b7c8b 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -1527,6 +1527,7 @@ void unregister_efivars(struct efivars *efivars)
                 sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var);
         kfree(efivars->new_var);
         kfree(efivars->del_var);
+        kobject_put(efivars->kobject);
         kset_unregister(efivars->kset);
 }
 EXPORT_SYMBOL_GPL(unregister_efivars);
@@ -1558,6 +1559,14 @@ int register_efivars(struct efivars *efivars,
                 goto out;
         }
 
+        efivars->kobject = kobject_create_and_add("efivars", parent_kobj);
+        if (!efivars->kobject) {
+                pr_err("efivars: Subsystem registration failed.\n");
+                error = -ENOMEM;
+                kset_unregister(efivars->kset);
+                goto out;
+        }
+
         /*
          * Per EFI spec, the maximum storage allocated for both
          * the variable name and variable data is 1024 bytes.