linux-kernel - [PATCH 3.4 026/107] libata: add ATA_HORKAGE

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Message-Id: <1458115601-5762-26-git-send-email-lizf@kernel.org>
Date:	Wed, 16 Mar 2016 16:05:20 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Arne Fitzenreiter <arne_f@...ire.org>,
	Tejun Heo <tj@...nel.org>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 026/107] libata: add ATA_HORKAGE_NOTRIM

From: Arne Fitzenreiter <arne_f@...ire.org>

3.4.111-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 71d126fd28de2d4d9b7b2088dbccd7ca62fad6e0 upstream.

Some devices lose data on TRIM whether queued or not.  This patch adds
a horkage to disable TRIM.

tj: Collapsed unnecessary if() nesting.

Signed-off-by: Arne Fitzenreiter <arne_f@...ire.org>
Signed-off-by: Tejun Heo <tj@...nel.org>
[lizf: Backported to 3.4:
 - adjust context
 - drop changes to show_ata_dev_trim()]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/ata/libata-scsi.c | 3 ++-
 include/linux/libata.h    | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 15863a4..94ccbc1 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2461,7 +2461,8 @@ static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
 		rbuf[14] = (lowest_aligned >> 8) & 0x3f;
 		rbuf[15] = lowest_aligned;
 
-		if (ata_id_has_trim(args->id)) {
+		if (ata_id_has_trim(args->id) &&
+		    !(dev->horkage & ATA_HORKAGE_NOTRIM)) {
 			rbuf[14] |= 0x80; /* TPE */
 
 			if (ata_id_has_zero_after_trim(args->id))
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 35e7f71..9736dbe 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -402,6 +402,8 @@ enum {
 	ATA_HORKAGE_BROKEN_FPDMA_AA	= (1 << 15),	/* skip AA */
 	ATA_HORKAGE_DUMP_ID	= (1 << 16),	/* dump IDENTIFY data */
 	ATA_HORKAGE_MAX_SEC_LBA48 = (1 << 17),	/* Set max sects to 65535 */
+	ATA_HORKAGE_NOTRIM      = (1 << 24),	/* don't use TRIM */
+
 
 	 /* DMA mask for user DMA control: User visible values; DO NOT
 	    renumber */
-- 
1.9.1