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

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Date:	Fri, 13 Nov 2015 08:24:05 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	Sreekanth Reddy <sreekanth.reddy@...gotech.com>, 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
Subject: Re: [PATCH] mpt3sas: Fix use sas_is_tlr_enabled API before enabling
 MPI2_SCSIIO_CONTROL_TLR_ON flag

On 11/12/2015 07:10 PM, Sreekanth Reddy wrote:
> 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);
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		               zSeries & Storage
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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