[PATCH 2/2] libata: disable queued TRIMs for Micron M500 SSDs

[Marc Carino <marc.ceeeee@gmail.com>]

The Micron/Crucial M500 SSDs exhibit incorrect protocol behavior when
issuing queued TRIM commands, which could lead to silent data corruption.

Disable issuance of queued TRIM commands for the affected drives.

Signed-off-by: Marc Carino <marc.ceeeee@gmail.com>
---
 drivers/ata/libata-core.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index ff01584..715ba06 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2152,6 +2152,13 @@ static int ata_dev_config_ncq(struct ata_device *dev,
 			dev->flags |= ATA_DFLAG_NCQ_SEND_RECV;
 			memcpy(dev->ncq_send_recv_cmds, ap->sector_buf,
 				ATA_LOG_NCQ_SEND_RECV_SIZE);
+
+			if (dev->horkage & ATA_HORKAGE_BROKEN_QUEUED_TRIM) {
+				ata_dev_dbg(dev,
+					    "disabling queued TRIM support\n");
+				dev->ncq_send_recv_cmds[ATA_LOG_NCQ_SEND_RECV_DSM_OFFSET]
+					&= ~ATA_LOG_NCQ_SEND_RECV_DSM_TRIM;
+			}
 		}
 	}
 
@@ -4205,6 +4212,10 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
 	{ "PIONEER DVD-RW  DVR-212D",	NULL,	ATA_HORKAGE_NOSETXFER },
 	{ "PIONEER DVD-RW  DVR-216D",	NULL,	ATA_HORKAGE_NOSETXFER },
 
+	/* Devices that don't properly handle queued TRIM commands */
+	{ "Micron_M500*",		NULL,	ATA_HORKAGE_BROKEN_QUEUED_TRIM, },
+	{ "Crucial_CT???M500SSD1",	NULL,	ATA_HORKAGE_BROKEN_QUEUED_TRIM, },
+
 	/* End Marker */
 	{ }
 };
-- 
1.8.1.3