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Huacai Chen ad40571b7a scsi: libsas: align sata_device's rps_resp on a cacheline 
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 84bda12af3 ("libata:
align ap->sector_buf") and Commit 4ee34ea3a12396f35b26 ("libata: Align
ata_device's id on a cacheline").

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
 		2019-07-27 21:46:11 +02:00
..
acpi
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asm-generic scsi: dma-mapping: always provide dma_get_cache_alignment 2019-07-27 21:46:11 +02:00
clocksource
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crypto crypto: hmac - require that the underlying hash algorithm is unkeyed 2019-07-27 21:45:46 +02:00
drm Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
dt-bindings
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keys
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kvm
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linux scsi: dma-mapping: always provide dma_get_cache_alignment 2019-07-27 21:46:11 +02:00
math-emu
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media Merge tag 'LA.BR.1.3.6-03510-8976.0' into HEAD 2017-04-18 12:11:50 +02:00
memory
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misc
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net ipv4: use separate genid for next hop exceptions 2019-07-27 21:45:24 +02:00
pcmcia
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ras
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rdma RDMA/core: Fix incorrect structure packing for booleans 2019-07-27 21:43:09 +02:00
rxrpc
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scsi scsi: libsas: align sata_device's rps_resp on a cacheline 2019-07-27 21:46:11 +02:00
sdp Import latest Samsung release 2017-04-18 03:43:52 +02:00
soc/qcom Merge tag 'LA.BR.1.3.6-03910-8976.0' of https://source.codeaurora.org/quic/la/kernel/msm-3.10 into HEAD 2017-05-26 13:28:48 +02:00
sound ALSA: seq: Avoid invalid lockdep class warning 2019-07-27 21:45:44 +02:00
target target: Avoid mappedlun symlink creation during lun shutdown 2019-07-27 21:44:16 +02:00
trace tracing: Add #undef to fix compile error 2019-07-27 21:43:11 +02:00
uapi uapi: fix linux/packet_diag.h userspace compilation error 2019-07-27 21:44:00 +02:00
video
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xen Merge remote-tracking branch 'f2fs/linux-3.10.y' into HEAD 2017-04-18 17:02:28 +02:00
Kbuild
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