linux-kernel - [PATCH 3.10 144/319] scsi: megaraid_sas: fix macro MEGASAS_IS

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Message-Id: <1486322541-8206-45-git-send-email-w@1wt.eu>
Date:   Sun,  5 Feb 2017 20:19:26 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Sumit Saxena <sumit.saxena@...adcom.com>,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 144/319] scsi: megaraid_sas: fix macro MEGASAS_IS_LOGICAL to avoid regression

From: Sumit Saxena <sumit.saxena@...adcom.com>

commit 5e5ec1759dd663a1d5a2f10930224dd009e500e8 upstream.

This patch will fix regression caused by commit 1e793f6fc0db ("scsi:
megaraid_sas: Fix data integrity failure for JBOD (passthrough)
devices").

The problem was that the MEGASAS_IS_LOGICAL macro did not have braces
and as a result the driver ended up exposing a lot of non-existing SCSI
devices (all SCSI commands to channels 1,2,3 were returned as
SUCCESS-DID_OK by driver).

[mkp: clarified patch description]

Fixes: 1e793f6fc0db920400574211c48f9157a37e3945
Reported-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Kashyap Desai <kashyap.desai@...adcom.com>
Signed-off-by: Sumit Saxena <sumit.saxena@...adcom.com>
Tested-by: Sumit Saxena <sumit.saxena@...adcom.com>
Reviewed-by: Tomas Henzl <thenzl@...hat.com>
Tested-by: Jens Axboe <axboe@...com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/scsi/megaraid/megaraid_sas.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 280e769..a0e0a61 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -1402,7 +1402,7 @@ struct megasas_instance_template {
 };
 
 #define MEGASAS_IS_LOGICAL(scp)						\
-	(scp->device->channel < MEGASAS_MAX_PD_CHANNELS) ? 0 : 1
+	((scp->device->channel < MEGASAS_MAX_PD_CHANNELS) ? 0 : 1)
 
 #define MEGASAS_DEV_INDEX(inst, scp)					\
 	((scp->device->channel % 2) * MEGASAS_MAX_DEV_PER_CHANNEL) + 	\
-- 
2.8.0.rc2.1.gbe9624a