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From:   "Lee, Chun-Yi" <joeyli.kernel@gmail.com>
To:     Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc:     linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
        "Lee, Chun-Yi" <jlee@suse.com>,
        Matthias Brugger <mbrugger@suse.com>,
        Fabian Vogt <fvogt@suse.com>,
        Ilias Apalodimas <ilias.apalodimas@linaro.org>,
        Ard Biesheuvel <ardb@kernel.org>
Subject: [PATCH v2] efi/efivars: Create efivars mount point via efivars abstraction
Date:   Wed, 26 Aug 2020 00:07:19 +0800
Message-Id: <20200825160719.7188-1-jlee@suse.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

This patch creates efivars mount point when active efivars abstraction
be set. It is useful for userland to determine the availability of efivars
filesystem.

v2:
Using efivars_kobject() helper instead of checking GetVariable or
GetNextVariable EFI runtime services. Because the efivarfs code could be
instantiated using a different efivars abstraction.

Cc: Matthias Brugger <mbrugger@suse.com>
Cc: Fabian Vogt <fvogt@suse.com>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: "Lee, Chun-Yi" <jlee@suse.com>
---
 drivers/firmware/efi/efi.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 3aa07c3b5136..db483fc68501 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -405,11 +405,13 @@ 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 (efivars_kobject()) {
+		/* 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