[PATCH 3.13.y-ckt 12/43] libata: Align ata_device's id on a cacheline

From: Kamal Mostafa
Date: Tue Mar 22 2016 - 17:04:42 EST

3.13.11-ckt37 -stable review patch. If anyone has any objections, please let me know.


From: Harvey Hunt <harvey.hunt@xxxxxxxxxx>

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@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
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 8c58412..875f541 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -714,7 +714,7 @@ 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];