linux-kernel - [PATCH v6 4/4] SCT Write Same handle ATA_DFLAG

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Date:   Sun, 21 Aug 2016 23:23:21 -0500
From:   Shaun Tancheff <shaun@...cheff.com>
To:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Shaun Tancheff <shaun@...cheff.com>, Tejun Heo <tj@...nel.org>,
        Christoph Hellwig <hch@....de>, Tom Yan <tom.ty89@...il.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Damien Le Moal <damien.lemoal@...t.com>,
        Hannes Reinecke <hare@...e.de>,
        Josh Bingaman <josh.bingaman@...gate.com>,
        Hannes Reinecke <hare@...e.com>,
        Shaun Tancheff <shaun.tancheff@...gate.com>
Subject: [PATCH v6 4/4] SCT Write Same handle ATA_DFLAG_PIO

Use non DMA write log when ATA_DFLAG_PIO is set.

Signed-off-by: Shaun Tancheff <shaun.tancheff@...gate.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