[<prev] [next>] [day] [month] [year] [list]
Message-Id: <1458157279-6245-1-git-send-email-kamal@canonical.com>
Date: Wed, 16 Mar 2016 12:41:19 -0700
From: Kamal Mostafa <kamal@...onical.com>
To: Harvey Hunt <harvey.hunt@...tec.com>
Cc: linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
Kamal Mostafa <kamal@...onical.com>,
kernel-team@...ts.ubuntu.com
Subject: [3.19.y-ckt stable] Patch "libata: Align ata_device's id on a cacheline" has been added to the 3.19.y-ckt tree
This is a note to let you know that I have just added a patch titled
libata: Align ata_device's id on a cacheline
to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue
This patch is scheduled to be released in version 3.19.8-ckt17.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Kamal
---8<------------------------------------------------------------
>From dff6b608497bff6c70fe5e99cf5803cf37a54d8b Mon Sep 17 00:00:00 2001
From: Harvey Hunt <harvey.hunt@...tec.com>
Date: Wed, 24 Feb 2016 15:16:43 +0000
Subject: libata: Align ata_device's id on a cacheline
commit 4ee34ea3a12396f35b26d90a094c75db95080baa upstream.
The id 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 ATA device.
Fix this by ensuring that the id buffer is cacheline aligned.
This issue is similar to that fixed by Commit 84bda12af31f
("libata: align ap->sector_buf").
Signed-off-by: Harvey Hunt <harvey.hunt@...tec.com>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
include/linux/libata.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/libata.h b/include/linux/libata.h
index e67edef..ac5bd91 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -716,7 +716,7 @@ struct ata_device {
union {
u16 id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
u32 gscr[SATA_PMP_GSCR_DWORDS]; /* PMP GSCR block */
- };
+ } ____cacheline_aligned;
/* DEVSLP Timing Variables from Identify Device Data Log */
u8 devslp_timing[ATA_LOG_DEVSLP_SIZE];
--
2.7.0
Powered by blists - more mailing lists