scsi: libsas: Set data_dir as DMA_NONE if libata marks qc as NODATA

[ Upstream commit 53de092f47ff40e8d4d78d590d95819d391bf2e0 ]

It was discovered that sdparm will fail when attempting to disable write
cache on a SATA disk connected via libsas.

In the ATA command set the write cache state is controlled through the SET
FEATURES operation. This is roughly corresponds to MODE SELECT in SCSI and
the latter command is what is used in the SCSI-ATA translation layer. A
subtle difference is that a MODE SELECT carries data whereas SET FEATURES
is defined as a non-data command in ATA.

Set the DMA data direction to DMA_NONE if the requested ATA command is
identified as non-data.

[mkp: commit desc]

Fixes: fa1c1e8f1ece ("[SCSI] Add SATA support to libsas")
Link: https://lore.kernel.org/r/1598426666-54544-1-git-send-email-luojiaxing@huawei.com
Reviewed-by: John Garry <john.garry@huawei.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 70be4425ae0be495c0d08d3408a20c3c7d90d6a7..470e11b4282087e030328e3e3df7af2decc3bc0c 100644 (file)
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -227,7 +227,10 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
                task->num_scatter = si;
        }
 
-       task->data_dir = qc->dma_dir;
+       if (qc->tf.protocol == ATA_PROT_NODATA)
+               task->data_dir = DMA_NONE;
+       else
+               task->data_dir = qc->dma_dir;
        task->scatter = qc->sg;
        task->ata_task.retry_count = 1;
        task->task_state_flags = SAS_TASK_STATE_PENDING;