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[SCSI] sd: Issue correct protection operation

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Use the same logic to prepare RD/WRPROTECT and the protection
operation.  Fixes a corner case where we could issue an unprotected
CDB and yet tell the HBA to do DIF to the drive.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Martin K. Petersen 2008-09-19 18:47:19 -04:00 committed by James Bottomley
parent c82dc88dda
commit bd623e79fb
1 changed files with 4 additions and 3 deletions
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7
drivers/scsi/sd.c
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@ -384,7 +384,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
sector_t block = rq->sector;
sector_t threshold;
unsigned int this_count = rq->nr_sectors;
int ret;
int ret, host_dif;
if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
ret = scsi_setup_blk_pc_cmnd(sdp, rq);
@ -515,7 +515,8 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
rq->nr_sectors));
/* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
if (scsi_host_dif_capable(sdp->host, sdkp->protection_type))
host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
if (host_dif)
SCpnt->cmnd[1] = 1 << 5;
else
SCpnt->cmnd[1] = 0;
@ -573,7 +574,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
SCpnt->sdb.length = this_count * sdp->sector_size;
/* If DIF or DIX is enabled, tell HBA how to handle request */
if (sdkp->protection_type || scsi_prot_sg_count(SCpnt))
if (host_dif || scsi_prot_sg_count(SCpnt))
sd_dif_op(SCpnt, sdkp->protection_type, scsi_prot_sg_count(SCpnt));
/*