[PATCH v6 4/4] SCT Write Same handle ATA_DFLAG_PIO

Shaun Tancheff
2016-08-22T04:25:10Z

Use non DMA write log when ATA_DFLAG_PIO is set.

Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
---
v6: Added check for ATA_DFLAG_PIO and fallback to non DMA write log for
SCT Write Same

drivers/ata/libata-scsi.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 37f456e..e50b7a7 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3485,6 +3485,8 @@ static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
tf->device = ATA_CMD_STANDBYNOW1;
tf->protocol = ATA_PROT_DMA;
tf->command = ATA_CMD_WRITE_LOG_DMA_EXT;
+ if (unlikely(dev->flags & ATA_DFLAG_PIO))
+ tf->command = ATA_CMD_WRITE_LOG_EXT;
}

tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
--
2.9.3