linux-kernel - [PATCH 3.2 009/140] scsi: libsas: align sata_device's rps

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Message-ID: <lsq.1519831221.685047854@decadent.org.uk>
Date:   Wed, 28 Feb 2018 15:20:21 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Huacai Chen" <chenhc@...ote.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Christoph Hellwig" <hch@....de>
Subject: [PATCH 3.2 009/140] scsi: libsas: align sata_device's rps_resp on
 a cacheline

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

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

From: Huacai Chen <chenhc@...ote.com>

commit c2e8fbf908afd81ad502b567a6639598f92c9b9d upstream.

The rps_resp buffer in ata_device is a DMA target, but it isn't
explicitly cacheline aligned. Due to this, adjacent fields can be
overwritten with stale data from memory on non-coherent architectures.
As a result, the kernel is sometimes unable to communicate with an SATA
device behind a SAS expander.

Fix this by ensuring that the rps_resp buffer is cacheline aligned.

This issue is similar to that fixed by Commit 84bda12af31f93 ("libata:
align ap->sector_buf") and Commit 4ee34ea3a12396f35b26 ("libata: Align
ata_device's id on a cacheline").

Signed-off-by: Huacai Chen <chenhc@...ote.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/scsi/libsas.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -163,7 +163,6 @@ enum ata_command_set {

 struct sata_device {
         enum   ata_command_set command_set;
-        struct smp_resp        rps_resp; /* report_phy_sata_resp */
         __le16 *identify_device;
         __le16 *identify_packet_device;

@@ -172,6 +171,7 @@ struct sata_device {

 	struct ata_port *ap;
 	struct ata_host ata_host;
+	struct smp_resp rps_resp ____cacheline_aligned; /* report_phy_sata_resp */
 	u8     fis[ATA_RESP_FIS_SIZE];
 };