linux-kernel - [PATCH v2 2/2] drivers: libata: add sysctl: 'libata.allow

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Message-Id: <1559734587-32596-3-git-send-email-info@metux.net>
Date:   Wed,  5 Jun 2019 13:36:27 +0200
From:   "Enrico Weigelt, metux IT consult" <info@...ux.net>
To:     linux-kernel@...r.kernel.org
Cc:     axboe@...nel.dk, linux-ide@...r.kernel.org
Subject: [PATCH v2 2/2] drivers: libata: add sysctl: 'libata.allow_tpm' for self-encrypted devices

libata tpm functionality, needed for self encrypted devices (OPAL, ...),
is currently disabled per default and needs to be enabled via kernel
command line.

This patch allows enabling it via sysctl.

The implementation might look a bit 'naive', as there aren't any locks
or barriers, etc. As we're dealing just w/ a plain boolean value, that's
only checked when an tpm-related ioctl is called, we're fine w/ that.

Signed-off-by: Enrico Weigelt, metux IT consult <info@...ux.net>
---
 drivers/ata/libata-core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 2af2470..f241028 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -161,6 +161,13 @@ struct ata_force_ent {
 MODULE_VERSION(DRV_VERSION);
 
 static struct ctl_table ctl_libata[] = {
+	{
+		.procname	= "allow_tpm",
+		.data		= &libata_allow_tpm,
+		.maxlen		= sizeof(libata_allow_tpm),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
 	{}
 };
 
-- 
1.9.1