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Larry Finger 4f62fb888d rtlwifi: rtl8821ae: Fix connection lost problem correctly 
commit c713fb071e upstream.

There has been a coding error in rtl8821ae since it was first introduced,
namely that an 8-bit register was read using a 16-bit read in
_rtl8821ae_dbi_read(). This error was fixed with commit 40b368af4b
("rtlwifi: Fix alignment issues"); however, this change led to
instability in the connection. To restore stability, this change
was reverted in commit b8b8b16352 ("rtlwifi: rtl8821ae: Fix connection
lost problem").

Unfortunately, the unaligned access causes machine checks in ARM
architecture, and we were finally forced to find the actual cause of the
problem on x86 platforms. Following a suggestion from Pkshih
<pkshih@realtek.com>, it was found that increasing the ASPM L1
latency from 0 to 7 fixed the instability. This parameter was varied to
see if a smaller value would work; however, it appears that 7 is the
safest value. A new symbol is defined for this quantity, thus it can be
easily changed if necessary.

Fixes: b8b8b16352 ("rtlwifi: rtl8821ae: Fix connection lost problem")
Cc: Stable <stable@vger.kernel.org> # 4.14+
Fix-suggested-by: Pkshih <pkshih@realtek.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Tested-by: James Cameron <quozl@laptop.org>  # x86_64 OLPC NL3
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-02-22 15:45:00 +01:00
..
accessibility
acpi ACPI: sbshc: remove raw pointer from printk() message 2018-02-16 20:09:47 +01:00
amba
android ANDROID: binder: fix proc->tsk check. 2017-08-30 10:19:26 +02:00
ata ahci: Add Intel Cannon Lake PCH-H PCI ID 2018-02-16 20:09:42 +01:00
atm atm: horizon: Fix irq release error 2017-12-16 10:33:55 +01:00
auxdisplay
base drivers: base: cacheinfo: fix boot error message when acpi is enabled 2018-01-31 12:06:08 +01:00
bcma bcma: use (get|put)_device when probing/removing device driver 2017-03-12 06:37:30 +01:00
block pktcdvd: Fix pkt_setup_dev() error path 2018-02-16 20:09:47 +01:00
bluetooth Bluetooth: btusb: Restore QCA Rome suspend/resume fix with a "rewritten" version 2018-02-16 20:09:46 +01:00
bus sunxi-rsb: Include OF based modalias in device uevent 2018-01-10 09:27:09 +01:00
cdrom
char hwrng: core - sleep interruptible in read 2018-01-17 09:35:28 +01:00
clk clk: tegra: Fix cclk_lp divisor register 2017-12-20 10:04:59 +01:00
clocksource clockevents/drivers/cs5535: Improve resilience to spurious interrupts 2017-10-27 10:23:17 +02:00
connector connector: bump skb->users before callback invocation 2016-01-04 21:46:45 -05:00
cpufreq cpufreq: Add Loongson machine dependencies 2018-02-03 17:04:27 +01:00
cpuidle cpuidle: fix broadcast control when broadcast can not be entered 2017-12-25 14:22:15 +01:00
crypto crypto: caam - fix endless loop when DECO acquire fails 2018-02-16 20:09:45 +01:00
dca
devfreq PM / devfreq: Propagate error from devfreq_add_device() 2018-02-22 15:44:58 +01:00
dio
dma dmaengine: dmatest: fix container_of member in dmatest_callback 2018-02-16 20:09:39 +01:00
dma-buf
edac EDAC, octeon: Fix an uninitialized variable warning 2018-02-16 20:09:47 +01:00
eisa
extcon extcon: palmas: Check the parent instance to prevent the NULL 2017-11-21 09:21:18 +01:00
firewire firewire: net: fix fragmented datagram_size off-by-one 2016-11-10 16:36:35 +01:00
firmware efi/esrt: Cleanup bad memory map log messages 2017-12-20 10:04:56 +01:00
fmc
fpga
gpio gpio: ath79: add missing MODULE_DESCRIPTION/LICENSE 2018-02-03 17:04:26 +01:00
gpu drm/radeon: adjust tested variable 2018-02-22 15:44:59 +01:00
hid HID: quirks: Fix keyboard + touchpad on Toshiba Click Mini not working 2018-02-16 20:09:46 +01:00
hsi
hv x86/retpoline/hyperv: Convert assembler indirect jumps 2018-01-23 19:50:13 +01:00
hwmon hwmon: (pmbus) Use 64bit math for DIRECT format values 2018-02-03 17:04:28 +01:00
hwspinlock drivers/hwspinlock: fix race between radix tree insertion and lookup 2016-02-25 12:01:23 -08:00
hwtracing intel_th: pci: Add Gemini Lake support 2017-12-20 10:04:54 +01:00
i2c i2c: riic: fix restart condition 2017-12-16 10:33:53 +01:00
ide
idle intel_idle: Support for Intel Xeon Phi Processor x200 Product Family 2016-09-15 08:27:46 +02:00
iio iio: light: fix improper return value 2017-11-30 08:37:27 +00:00
infiniband IB/mlx4: Fix incorrectly releasing steerable UD QPs when have only ETH ports 2018-02-22 15:44:58 +01:00
input Input: trackpoint - force 3 buttons if 0 button is reported 2018-01-31 12:06:11 +01:00
iommu iommu/arm-smmu-v3: Don't free page table ops twice 2018-01-17 09:35:25 +01:00
ipack
irqchip irqchip/crossbar: Fix incorrect type of register size 2017-12-16 10:33:52 +01:00
isdn isdn: kcapi: avoid uninitialized data 2017-12-25 14:22:13 +01:00
leds leds: ktd2692: avoid harmless maybe-uninitialized warning 2017-05-14 13:32:55 +02:00
lguest
lightnvm lightnvm: put bio before return 2016-09-24 10:07:35 +02:00
macintosh
mailbox mailbox: handle empty message in tx_tick 2017-08-06 19:19:41 -07:00
mcb mcb: Fixed bar number assignment for the gdd 2016-06-01 12:15:53 -07:00
md bcache: check return value of register_shrinker 2018-02-03 17:04:27 +01:00
media media: cxusb, dib0700: ignore XC2028_I2C_FLUSH 2018-02-16 20:09:45 +01:00
memory ARM: OMAP2+: gpmc-onenand: propagate error on initialization failure 2017-12-16 10:33:51 +01:00
memstick memstick: rtsx_usb_ms: Manage runtime PM when accessing the device 2016-10-28 03:01:35 -04:00
message
mfd mfd: twl6040: Fix child-node lookup 2018-01-02 20:33:20 +01:00
misc cxl: Check if vphb exists before iterating over AFU devices 2017-12-25 14:22:08 +01:00
mmc mmc: sdhci-of-esdhc: add/remove some quirks according to vendor version 2018-01-31 12:06:09 +01:00
mtd ubi: block: Fix locking for idr_alloc/idr_remove 2018-02-16 20:09:41 +01:00
net rtlwifi: rtl8821ae: Fix connection lost problem correctly 2018-02-22 15:45:00 +01:00
nfc nfc: fdp: fix NULL pointer dereference 2017-08-06 19:19:40 -07:00
ntb ntb_transport: fix bug calculating num_qps_mw 2017-08-30 10:19:29 +02:00
nubus
nvdimm libnvdimm, namespace: make 'resource' attribute only readable by root 2017-11-30 08:37:23 +00:00
nvme nvme: Fix managing degraded controllers 2018-02-16 20:09:47 +01:00
nvmem nvmem: imx-ocotp: Fix wrong register size 2017-08-06 19:19:46 -07:00
of of: device: Export of_device_{get_modalias, uvent_modalias} to modules 2017-07-27 15:06:09 -07:00
oprofile
parisc parisc: Hide Diva-built-in serial aux and graphics card 2018-01-02 20:33:20 +01:00
parport parisc, parport_gsc: Fixes for printk continuation lines 2017-06-17 06:39:37 +02:00
pci PCI: layerscape: Fix MSG TLP drop setting 2018-01-31 12:06:08 +01:00
pcmcia pcmcia: db1xxx_ss: fix last irq_to_gpio user 2016-04-20 15:42:09 +09:00
perf drivers/perf: arm_pmu: Fix leak in error path 2016-10-07 15:23:41 +02:00
phy phy: work around 'phys' references to usb-nop-xceiv devices 2018-01-23 19:50:16 +01:00
pinctrl pinctrl: st: add irq_request/release_resources callbacks 2017-12-25 14:22:11 +01:00
platform platform/x86: hp-wmi: Do not shadow error values 2017-11-15 17:13:11 +01:00
pnp PNP: Add Broadwell to Intel MCH size workaround 2016-08-16 09:30:48 +02:00
power power: reset: zx-reboot: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE 2018-02-03 17:04:25 +01:00
powercap powercap / RAPL: fix BIOS lock check 2015-12-12 02:31:11 +01:00
pps pps: do not crash when failed to register 2016-08-10 11:49:25 +02:00
ps3
ptp
pwm pwm: pca9685: Fix period change with same duty cycle 2017-03-15 09:57:14 +08:00
rapidio
ras
regulator regulator: fan53555: fix I2C device ids 2017-11-02 09:40:50 +01:00
remoteproc remoteproc: Fix potential race condition in rproc_add 2016-08-20 18:09:20 +02:00
reset
rpmsg
rtc rtc-opal: Fix handling of firmware error codes, prevent busy loops 2018-02-22 15:44:59 +01:00
s390 s390/qeth: no ETH header for outbound AF_IUCV 2017-12-25 14:22:12 +01:00
sbus
scsi scsi: ufs: ufshcd: fix potential NULL pointer dereference in ufshcd_config_vreg 2018-02-03 17:04:29 +01:00
sfi
sh drivers: sh: Restore legacy clock domain on SuperH platforms 2016-03-09 15:34:49 -08:00
sn
soc soc: qcom/spm: shut up uninitialized variable warning 2016-09-24 10:07:42 +02:00
spi spi: imx: do not access registers while clocks disabled 2018-02-03 17:04:31 +01:00
spmi spmi: Include OF based modalias in device uevent 2017-07-27 15:06:10 -07:00
ssb ssb: Fix error routine when fallback SPROM fails 2017-01-09 08:07:42 +01:00
staging staging: rtl8188eu: Fix incorrect response to SIOCGIWESSID 2018-02-03 17:04:29 +01:00
target target: Avoid early CMD_T_PRE_EXECUTE failures during ABORT_TASK 2018-01-17 09:35:31 +01:00
tc
thermal thermal: hisilicon: Handle return value of clk_prepare_enable 2017-12-25 14:22:15 +01:00
thunderbolt thunderbolt: Fix double free of drom buffer 2016-06-01 12:15:53 -07:00
tty serial: imx: Only wakeup via RTSDEN bit if the system has RTS/CTS 2018-02-03 17:04:30 +01:00
uio uio: fix dmem_region_start computation 2016-10-31 04:13:59 -06:00
usb usb: gadget: uvc: Missing files for configfs interface 2018-02-16 20:09:40 +01:00
uwb uwb: ensure that endpoint is interrupt 2017-10-12 11:27:35 +02:00
vfio vfio-pci: Handle error from pci_iomap 2017-08-06 19:19:46 -07:00
vhost vhost_net: stop device during reset owner 2018-02-16 20:09:38 +01:00
video console/dummy: leave .con_font_get set to NULL 2018-02-22 15:45:00 +01:00
virt
virtio virtio: release virtio index when fail to device_register 2017-12-16 10:33:48 +01:00
vlynq
vme vme: Fix wrong pointer utilization in ca91cx42_slave_get 2017-01-19 20:17:21 +01:00
w1 w1: ds2490: USB transfer buffers need to be DMAable 2017-03-12 06:37:29 +01:00
watchdog watchdog: imx2_wdt: restore previous timeout after suspend+resume 2018-02-16 20:09:45 +01:00
xen xen: xenbus driver must not accept invalid transaction ids 2017-11-30 08:37:28 +00:00
zorro
Kconfig
Makefile usb: Make sure usb/phy/of gets built-in 2017-05-20 14:26:59 +02:00