linux-kernel - [PATCH] mpt3sas: Fix use sas_is_tlr_enabled API before enabling MPI2_SCSIIO_CONTROL_TLR

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Date:	Thu, 12 Nov 2015 23:40:37 +0530
From:	Sreekanth Reddy <sreekanth.reddy@...gotech.com>
To:	jejb@...nel.org
Cc:	martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
	JBottomley@...allels.com, Sathya.Prakash@...gotech.com,
	kashyap.desai@...gotech.com, linux-kernel@...r.kernel.org,
	hch@...radead.org, chaitra.basappa@...gotech.com,
	suganath-prabu.subramani@...gotech.com,
	Sreekanth Reddy <Sreekanth.Reddy@...gotech.com>
Subject: [PATCH] mpt3sas: Fix use sas_is_tlr_enabled API before enabling MPI2_SCSIIO_CONTROL_TLR_ON flag

Before enabling MPI2_SCSIIO_CONTROL_TLR_ON flag in MPI SCSI IO
request message, check whether TLR is enabled on the drive using
'sas_is_tlr_enabled' API.

Actually in the driver code, driver is using below API's

1. sas_enable_tlr() - to enable the TLR
2. sas_disable_tlr() - to disable the TLR
3. sas_is_tlr_enabled() - to check whether TLR is enabled or not.

but in scsih_qcmd() we have missed to use sas_is_tlr_enabled() API,
instead we checking for TLR bit from flag field of driver's
'struct MPT3SAS_DEVIC' structure. which is corrected with this patch.

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@...gotech.com>
---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index d95206b..9ab77b0 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -3905,8 +3905,7 @@ scsih_qcmd(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
 	 * We do not expose raid functionality to upper layer for warpdrive.
 	 */
 	if (!ioc->is_warpdrive && !scsih_is_raid(&scmd->device->sdev_gendev)
-	    && (sas_device_priv_data->flags & MPT_DEVICE_TLR_ON) &&
-	    scmd->cmd_len != 32)
+	    && sas_is_tlr_enabled(scmd->device) && scmd->cmd_len != 32)
 		mpi_control |= MPI2_SCSIIO_CONTROL_TLR_ON;
 
 	smid = mpt3sas_base_get_smid_scsiio(ioc, ioc->scsi_io_cb_idx, scmd);
-- 
2.0.2

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