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

[ Upstream commit 53de092f47 ]

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: fa1c1e8f1e ("[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>
This commit is contained in:
Luo Jiaxing 2020-08-26 15:24:26 +08:00 committed by Greg Kroah-Hartman
parent 5571056a58
commit b3f6c2ca32
1 changed files with 4 additions and 1 deletions
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5
drivers/scsi/libsas/sas_ata.c
View File

@ -208,7 +208,10 @@ 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;