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From:   David Kozub <zub@linux.fjfi.cvut.cz>
To:     Jens Axboe <axboe@kernel.dk>,
        Jonathan Derrick <jonathan.derrick@intel.com>,
        Scott Bauer <sbauer@plzdonthack.me>,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>,
        David Kozub <zub@linux.fjfi.cvut.cz>
Subject: [PATCH 01/16] block: sed-opal: fix IOC_OPAL_ENABLE_DISABLE_MBR
Date:   Thu, 14 Feb 2019 01:15:53 +0100
Message-Id: <1550103368-4605-2-git-send-email-zub@linux.fjfi.cvut.cz>
In-Reply-To: <1550103368-4605-1-git-send-email-zub@linux.fjfi.cvut.cz>
References: <1550103368-4605-1-git-send-email-zub@linux.fjfi.cvut.cz>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The implementation of IOC_OPAL_ENABLE_DISABLE_MBR handled the value
opal_mbr_data.enable_disable incorrectly: enable_disable is expected
to be one of OPAL_MBR_ENABLE(0) or OPAL_MBR_DISABLE(1). enable_disable
was passed directly to set_mbr_done and set_mbr_enable_disable where
is was interpreted as either OPAL_TRUE(1) or OPAL_FALSE(0). The end
result was that calling IOC_OPAL_ENABLE_DISABLE_MBR with OPAL_MBR_ENABLE
actually disabled the shadow MBR and vice versa.

This patch adds correct conversion from OPAL_MBR_DISABLE/ENABLE to
OPAL_FALSE/TRUE. The change affects existing programs using
IOC_OPAL_ENABLE_DISABLE_MBR but this is typically used only once when
setting up an Opal drive.

Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Acked-by: Jon Derrick <jonathan.derrick@intel.com>
---
 block/sed-opal.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index e0de4dd448b3..119640897293 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -2095,13 +2095,16 @@ static int opal_erase_locking_range(struct opal_dev *dev,
 static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
 					  struct opal_mbr_data *opal_mbr)
 {
+	u8 enable_disable = opal_mbr->enable_disable == OPAL_MBR_ENABLE ?
+		OPAL_TRUE : OPAL_FALSE;
+
 	const struct opal_step mbr_steps[] = {
 		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &opal_mbr->key },
-		{ set_mbr_done, &opal_mbr->enable_disable },
+		{ set_mbr_done, &enable_disable },
 		{ end_opal_session, },
 		{ start_admin1LSP_opal_session, &opal_mbr->key },
-		{ set_mbr_enable_disable, &opal_mbr->enable_disable },
+		{ set_mbr_enable_disable, &enable_disable },
 		{ end_opal_session, },
 		{ NULL, }
 	};
@@ -2221,7 +2224,7 @@ static int __opal_lock_unlock(struct opal_dev *dev,
 
 static int __opal_set_mbr_done(struct opal_dev *dev, struct opal_key *key)
 {
-	u8 mbr_done_tf = 1;
+	u8 mbr_done_tf = OPAL_TRUE;
 	const struct opal_step mbrdone_step [] = {
 		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, key },
-- 
2.20.1