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Keith Busch b69e2ef24b nvme-pci: dma read memory barrier for completions 
Control dependencies do not guarantee load order across the condition,
allowing a CPU to predict and speculate memory reads.

Commit 324b494c2862 inlined verifying a new completion with its
handling. At least one architecture was observed to access the contents
out of order, resulting in the driver using stale data for the
completion.

Add a dma read barrier before reading the completion queue entry and
after the condition its contents depend on to ensure the read order is
determinsitic.

Reported-by: John Garry <john.garry@huawei.com>
Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Tested-by: John Garry <john.garry@huawei.com>
Acked-by: Will Deacon <will@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-05-12 18:02:24 +02:00
..
accessibility
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acpi
More ACPI updates for 5.7-rc1
2020-04-10 09:52:15 -07:00
amba
Revert "amba: Initialize dma_parms for amba devices"
2020-04-01 08:03:28 +02:00
android
Merge 5.6-rc7 into char-misc-next
2020-03-23 07:59:38 +01:00
ata
ahci: Add Intel Comet Lake PCH-U PCI ID
2020-04-16 10:26:52 -06:00
atm
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
auxdisplay
Merge 5.6-rc7 into char-misc-next
2020-03-23 07:59:38 +01:00
base
mm/memory_hotplug: allow to specify a default online_type
2020-04-07 10:43:41 -07:00
bcma
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block
null_blk: Cleanup zoned device initialization
2020-04-23 09:35:09 -06:00
bluetooth
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bus
ARM: driver updates
2020-04-03 15:05:35 -07:00
cdrom
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char
Merge branch 'akpm' (patches from Andrew)
2020-04-10 17:57:48 -07:00
clk
There's not much to see in the core framework this time around. Instead the
2020-04-05 10:43:32 -07:00
clocksource
clocksource/drivers/timer-vf-pit: Add missing parenthesis
2020-04-05 09:24:58 +02:00
connector
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counter
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cpufreq
Additional power management updates for 5.7-rc1
2020-04-06 10:14:39 -07:00
cpuidle
Merge branch 'pm-cpuidle'
2020-04-10 11:32:22 +02:00
crypto
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2020-04-08 21:35:29 -07:00
dax
dax: Move mandatory ->zero_page_range() check in alloc_dax()
2020-04-02 19:15:03 -07:00
dca
…
devfreq
PM / devfreq: Fix handling dev_pm_qos_remove_request result
2020-03-25 08:35:03 +09:00
dio
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dma
drivers/dma/tegra20-apb-dma.c: fix platform_get_irq.cocci warnings
2020-04-10 15:36:22 -07:00
dma-buf
A bunch of fixes to avoid null pointer dereference in fbcon, fix a return
2020-04-08 09:14:34 +10:00
edac
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-30 16:40:08 -07:00
eisa
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
extcon
Char/Misc driver patches for 5.7-rc1
2020-04-03 13:22:40 -07:00
firewire
…
firmware
efi/libstub/file: Merge file name buffers to reduce stack usage
2020-04-14 08:32:15 +02:00
fpga
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fsi
…
gnss
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gpio
This is the bulk of GPIO development for the v5.7 kernel cycle.
2020-04-04 10:27:00 -07:00
gpu
Kbuild updates for v5.7 (2nd)
2020-04-11 09:46:12 -07:00
greybus
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hid
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
2020-04-01 15:18:42 -07:00
hsi
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hv
hyperv-fixes for 5.7-rc1
2020-04-14 11:58:04 -07:00
hwmon
change email address for Pali Rohár
2020-04-10 15:36:22 -07:00
hwspinlock
hwspinlock: hwspinlock_internal.h: Replace zero-length array with flexible-array member
2020-03-25 22:30:46 -07:00
hwtracing
intel_th: msu: Make stopping the trace optional
2020-03-24 13:45:24 +01:00
i2c
Merge branch 'i2c/for-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
2020-04-02 15:54:13 -07:00
i3c
i3c: convert to use i2c_new_client_device()
2020-03-29 10:35:50 +02:00
ide
drivers/ide: Fix build regression.
2020-04-04 18:07:59 -07:00
idle
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-30 16:40:08 -07:00
iio
chrome platform changes for 5.7
2020-04-08 21:25:49 -07:00
infiniband
RDMA 5.7 pull request
2020-04-01 18:18:18 -07:00
input
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2020-04-07 20:20:12 -07:00
interconnect
interconnect changes for 5.7
2020-03-20 13:45:25 +01:00
iommu
Merge branches 'iommu/fixes', 'arm/qcom', 'arm/omap', 'arm/smmu', 'x86/amd', 'x86/vt-d', 'virtio' and 'core' into next
2020-03-27 11:33:27 +01:00
ipack
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irqchip
Two reverts addressing regressions of the Xilinx interrupt controller
2020-04-05 11:57:12 -07:00
isdn
mISDN: make dmril and dmrim static
2020-04-16 13:52:31 -07:00
leds
leds: core: Fix warning message when init_data
2020-04-06 23:12:08 +02:00
lightnvm
for-5.7/drivers-2020-03-29
2020-03-30 11:43:51 -07:00
macintosh
Char/Misc driver patches for 5.7-rc1
2020-04-03 13:22:40 -07:00
mailbox
mailbox: imx: add SCU MU support
2020-03-19 23:04:32 -05:00
mcb
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md
libnvdimm for 5.7
2020-04-08 21:03:40 -07:00
media
Power management updates for 5.7-rc1
2020-03-30 15:05:01 -07:00
memory
ARM: driver updates
2020-04-03 15:05:35 -07:00
memstick
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message
scsi: message: fusion: Replace zero-length array with flexible-array member
2020-03-26 22:40:47 -04:00
mfd
mfd: intel-lpss: Fix Intel Elkhart Lake LPSS I2C input clock
2020-03-30 07:35:28 +01:00
misc
virtio: fixes, vdpa
2020-04-08 10:51:53 -07:00
mmc
MMC core:
2020-03-31 16:13:09 -07:00
most
staging: most: move core files out of the staging area
2020-03-24 13:42:44 +01:00
mtd
mtd: spi-nor: Compile files in controllers/ directory
2020-04-09 22:00:13 +02:00
mux
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net
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-04-16 14:52:29 -07:00
nfc
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-03-25 18:58:11 -07:00
ntb
pci-v5.7-changes
2020-04-03 14:25:02 -07:00
nubus
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nvdimm
libnvdimm for 5.7
2020-04-08 21:03:40 -07:00
nvme
nvme-pci: dma read memory barrier for completions
2020-05-12 18:02:24 +02:00
nvmem
nvmem: core: remove nvmem_sysfs_get_groups()
2020-03-25 19:23:49 +01:00
of
of: unittest: kmemleak in duplicate property update
2020-04-17 08:31:34 -05:00
opp
opp: Manage empty OPP tables with clk handle
2020-04-13 16:14:55 +05:30
oprofile
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parisc
parisc: Replace setup_irq() by request_irq()
2020-04-05 22:05:23 +02:00
parport
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pci
IOMMU Updates for Linux v5.7
2020-04-08 11:00:00 -07:00
pcmcia
pcmcia: remove some unused space characters
2020-03-31 18:48:22 +02:00
perf
arm64 updates for 5.7:
2020-03-31 10:05:01 -07:00
phy
pci-v5.7-changes
2020-04-03 14:25:02 -07:00
pinctrl
This is the bulk of GPIO development for the v5.7 kernel cycle.
2020-04-04 10:27:00 -07:00
platform
chrome-platform fixes for v5.7-rc2
2020-04-16 15:00:57 -07:00
pnp
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power
change email address for Pali Rohár
2020-04-10 15:36:22 -07:00
powercap
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-30 16:40:08 -07:00
pps
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ps3
powerpc/ps3: Remove an unneeded NULL check
2020-04-03 00:09:59 +11:00
ptp
ptp: Avoid deadlocks in the programmable pin code.
2020-03-30 11:16:38 -07:00
pwm
pwm: pca9685: Fix PWM/GPIO inter-operation
2020-04-03 21:41:42 +02:00
rapidio
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ras
…
regulator
spi/regulator: Updates for v5.7
2020-03-30 14:58:26 -07:00
remoteproc
remoteproc/omap: Fix set_load call in omap_rproc_request_timer
2020-04-03 10:47:21 -07:00
reset
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rpmsg
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rtc
- New Drivers
2020-04-07 19:48:52 -07:00
s390
s390/dasd: remove IOSCHED_DEADLINE from DASD Kconfig
2020-04-17 08:05:27 -06:00
sbus
misc: move FLASH_MINOR into miscdevice.h and fix conflicts
2020-03-18 12:27:04 +01:00
scsi
SCSI misc on 20200410
2020-04-10 12:21:11 -07:00
sfi
…
sh
…
siox
…
slimbus
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soc
RISC-V Patches for the 5.7 Merge Window, Part 1
2020-04-09 10:51:30 -07:00
soundwire
Char/Misc driver patches for 5.7-rc1
2020-04-03 13:22:40 -07:00
spi
sound updates for 5.7-rc1
2020-04-02 15:50:04 -07:00
spmi
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ssb
…
staging
mm/vma: introduce VM_ACCESS_FLAGS
2020-04-10 15:36:21 -07:00
target
SCSI misc on 20200410
2020-04-10 12:21:11 -07:00
tc
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tee
ARM: driver updates
2020-04-03 15:05:35 -07:00
thermal
- Convert tsens configuration DT binding to yaml (Rajeshwari)
2020-04-07 20:00:16 -07:00
thunderbolt
Merge 5.6-rc7 into usb-next
2020-03-23 08:04:08 +01:00
tty
powerpc updates for 5.7
2020-04-05 11:12:59 -07:00
uio
uio: uio_pdrv_genirq: use new devm_uio_register_device() function
2020-03-18 12:34:10 +01:00
usb
SCSI misc on 20200402
2020-04-02 17:03:53 -07:00
vdpa
vdpa: move to drivers/vdpa
2020-04-02 10:41:40 -04:00
vfio
vfio: Ignore -ENODEV when getting MSI cookie
2020-04-01 13:51:51 -06:00
vhost
vhost: introduce vDPA-based backend
2020-04-02 10:41:40 -04:00
video
drm fixes for 5.7-rc1
2020-04-07 20:24:34 -07:00
virt
virt: vbox: Use fallthrough;
2020-03-19 07:41:03 +01:00
virtio
virtio: fixes, vdpa
2020-04-08 10:51:53 -07:00
visorbus
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vlynq
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vme
…
w1
…
watchdog
watchdog: sp805: fix restart handler
2020-04-08 11:18:38 +02:00
xen
xen: branch for v5.7-rc2
2020-04-17 10:35:17 -07:00
zorro
SPDX patches for 5.7-rc1.
2020-04-03 13:12:26 -07:00
Kconfig
virtio: fixes, vdpa
2020-04-08 10:51:53 -07:00
Makefile
virtio: fixes, vdpa
2020-04-08 10:51:53 -07:00