[PATCH] libsas: fix usage of ata_tf_to_fis

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Since commit 110dd8f19df5 "[SCSI] libsas: fix scr_read/write users and
update the libata documentation" we have been passing pmp=1 and is_cmd=0
to ata_tf_to_fis().  Praveen reports that eSATA attached drives do not
discover correctly.  His investigation found that the BIOS was passing
pmp=0 while Linux was passing pmp=1 and failing to discover the drives.
Update libsas to follow the libata example of pulling the pmp setting
from the ata_link and correct is_cmd to be 1 since all tf's submitted
through ->qc_issue are commands.  Presumably libsas lldds do not care
about is_cmd as they have sideband mechanisms to perform link
management.

http://marc.info/?l=linux-scsi&m=138179681726990&w=2

Cc: xjtuwjp@xxxxxxxxx
Cc: lindar_liu@xxxxxxxxx
Cc: Lukasz Dorau <lukasz.dorau@xxxxxxxxx>
Cc: Maciej Patelczyk <maciej.patelczyk@xxxxxxxxx>
Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
Cc: Xiangliang Yu <yuxiangl@xxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Praveen Murali <pmurali@xxxxxxxxxxxx>
Tested-by: Praveen Murali <pmurali@xxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
 drivers/scsi/libsas/sas_ata.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 161c98efade9..d0fb99d5da95 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -211,7 +211,7 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 		qc->tf.nsect = 0;
 	}
 
-	ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
+	ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8*)&task->ata_task.fis);
 	task->uldd_task = qc;
 	if (ata_is_atapi(qc->tf.protocol)) {
 		memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);

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