[PATCH 3.2 080/126] scsi: megaraid_sas: fix macro MEGASAS_IS_LOGICAL to avoid regression

From: Ben Hutchings
Date: Wed Feb 15 2017 - 17:56:16 EST


3.2.85-rc1 review patch. If anyone has any objections, please let me know.

------------------

From: Sumit Saxena <sumit.saxena@xxxxxxxxxxxx>

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@xxxxxxxxx>
Signed-off-by: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>
Signed-off-by: Sumit Saxena <sumit.saxena@xxxxxxxxxxxx>
Tested-by: Sumit Saxena <sumit.saxena@xxxxxxxxxxxx>
Reviewed-by: Tomas Henzl <thenzl@xxxxxxxxxx>
Tested-by: Jens Axboe <axboe@xxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/scsi/megaraid/megaraid_sas.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- 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) + \