[PATCH 3.2 101/185] [SCSI] libsas: fix usage of ata_tf_to_fis

From: Ben Hutchings
Date: Sat Dec 28 2013 - 21:40:34 EST

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


From: Dan Williams <dan.j.williams@xxxxxxxxx>

commit ae5fbae0ccd982dfca0ce363036ed92f5b13f150 upstream.

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


[jejb: checkpatch fix]
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Reported-by: Praveen Murali <pmurali@xxxxxxxxxxxx>
Tested-by: Praveen Murali <pmurali@xxxxxxxxxxxx>
Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
drivers/scsi/libsas/sas_ata.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -197,7 +197,7 @@ static unsigned int sas_ata_qc_issue(str
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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