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VAMSHI GAJJELA 4f4e670342 serial: 8250_dw: Avoid pslverr on reading empty receiver fifo 
With PSLVERR_RESP_EN parameter set to 1, the device generates an error
response when an attempt to read an empty RBR with FIFO enabled.

This happens when LCR writes are ignored when UART is busy.
dw8250_check_lcr() in retries to update LCR, invokes dw8250_force_idle()
to clear and reset FIFO and eventually reads UART_RX causing the error.

Avoid this by not reading RBR/UART_RX when no data is available.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: VAMSHI GAJJELA <vamshigajjela@google.com>
Link: https://lore.kernel.org/r/20220713131722.2316829-1-vamshigajjela@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-07-14 16:33:35 +02:00
..
accessibility
serial: Consolidate BOTH_EMPTY use
2022-06-27 14:41:31 +02:00
acpi
More power management updates for 5.19-rc1
2022-05-30 11:37:26 -07:00
amba
Driver core changes for 5.19-rc1
2022-06-03 11:48:47 -07:00
android
fix for breakage in #work.fd this window
2022-06-05 17:14:03 -07:00
ata
ata: libata-transport: fix {dma|pio|xfer}_mode sysfs files
2022-06-09 09:25:25 +09:00
atm
…
auxdisplay
…
base
Merge tag 'fs_for_v5.19-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2022-06-17 10:09:24 -07:00
bcma
…
block
xen: branch for v5.19-rc1b
2022-06-04 13:42:53 -07:00
bluetooth
Bluetooth: btmtksdio: fix the reset takes too long
2022-05-13 13:19:01 +02:00
bus
bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove()
2022-06-10 15:53:12 +02:00
cdrom
cdrom: remove obsolete TODO list
2022-05-15 18:31:28 -06:00
char
Char/Misc driver fixes for 5.19-rc3
2022-06-17 07:58:39 -07:00
clk
Driver core changes for 5.19-rc1
2022-06-03 11:48:47 -07:00
clocksource
clocksource: hyper-v: unexport __init-annotated hv_init_clocksource()
2022-06-08 12:27:08 +00:00
comedi
comedi: vmk80xx: fix expression for tx buffer size
2022-06-10 15:21:23 +02:00
connector
…
counter
…
cpufreq
ARM: multiplatform changes, part 2
2022-06-02 15:23:54 -07:00
cpuidle
Merge branches 'pm-em' and 'pm-cpuidle'
2022-05-23 19:18:51 +02:00
crypto
virtio-crypto: enable retry for virtio-crypto-dev
2022-05-31 12:45:09 -04:00
cxl
cxl/port: Enable HDM Capability after validating DVSEC Ranges
2022-05-20 12:30:53 -07:00
dax
dax: add .recovery_write dax_operation
2022-05-16 13:37:59 -07:00
dca
…
devfreq
PM / devfreq: passive: Return non-error when not-supported event is required
2022-05-19 19:32:19 +02:00
dio
drivers: dio: add missing iounmap() in dio_init()
2022-05-19 18:56:51 +02:00
dma
dmaengine updates for v5.19-rc1
2022-05-29 11:38:27 -07:00
dma-buf
drm for 5.19-rc1
2022-05-25 16:18:27 -07:00
edac
- A gargen variety of fixes which don't fit any other tip bucket:
2022-05-23 19:32:59 -07:00
eisa
…
extcon
extcon: Modify extcon device to be created after driver data is set
2022-05-13 17:03:41 +09:00
firewire
Merge branch 'for-linus' into for-next
2022-05-23 07:48:27 +02:00
firmware
Follow-up tweaks for the EFI changes in v5.19
2022-06-03 13:39:30 -07:00
fpga
…
fsi
…
gnss
…
gpio
gpio: dwapb: Don't print error on -EPROBE_DEFER
2022-06-10 14:26:15 +02:00
gpu
two regression fixups
2022-06-17 11:32:35 +10:00
greybus
…
hid
HID: hyperv: Correctly access fields declared as __le16
2022-06-08 12:28:13 +00:00
hsi
…
hte
hte: Uninitialized variable in hte_ts_get()
2022-05-20 15:54:41 +02:00
hv
Drivers: hv: vmbus: Release cpu lock in error case
2022-06-10 08:41:28 +00:00
hwmon
hwmon: (asus-ec-sensors) add missing comma in board name list.
2022-06-15 08:14:38 -07:00
hwspinlock
…
hwtracing
…
i2c
i2c: mediatek: Fix an error handling path in mtk_i2c_probe()
2022-06-14 22:11:54 +02:00
i3c
i3c: master: svc: fix returnvar.cocci warning
2022-05-17 22:34:42 +02:00
idle
cpuidle,intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE
2022-06-08 18:05:45 +02:00
iio
Bitmap patches for 5.19-rc1
2022-06-04 14:04:27 -07:00
infiniband
v5.19 pull request
2022-05-26 21:08:40 -07:00
input
Input updates for v5.19-rc1
2022-06-07 15:00:29 -07:00
interconnect
Char / Misc / Other smaller driver subsystem updates for 5.19-rc1
2022-06-03 11:36:34 -07:00
iommu
IOMMU Updates for Linux v5.19
2022-05-31 09:56:54 -07:00
ipack
…
irqchip
irqchip/loongson-liointc: Use architecture register to get coreid
2022-06-10 08:57:19 +01:00
isdn
…
leds
ARM: multiplatform changes, part 2
2022-06-02 15:23:54 -07:00
macintosh
macintosh: via-pmu and via-cuda need RTC_LIB
2022-05-22 15:58:30 +10:00
mailbox
mailbox: qcom-ipcc: Fix -Wunused-function with CONFIG_PM_SLEEP=n
2022-05-24 08:08:24 -05:00
mcb
…
md
block-5.19-2022-06-16
2022-06-17 11:22:58 -07:00
media
USB / Thunderbolt changes for 5.19-rc1
2022-06-03 11:17:49 -07:00
memory
More power management updates for 5.19-rc1
2022-05-30 11:37:26 -07:00
memstick
…
message
…
mfd
ARM: multiplatform changes, part 2
2022-06-02 15:23:54 -07:00
misc
Char/Misc driver fixes for 5.19-rc3 - take 2
2022-06-19 09:37:29 -05:00
mmc
MMC core:
2022-06-07 14:24:30 -07:00
most
…
mtd
This pull request contains fixes for JFFS2, UBI and UBIFS
2022-06-03 14:42:24 -07:00
mux
…
net
net: axienet: add missing error return code in axienet_probe()
2022-06-16 11:08:38 -07:00
nfc
nfc: nfcmrvl: Fix memory leak in nfcmrvl_play_deferred
2022-06-08 10:18:10 -07:00
ntb
…
nubus
…
nvdimm
cxl for 5.19
2022-05-27 21:24:19 -07:00
nvme
nvme-pci: disable write zeros support on UMIC and Samsung SSDs
2022-06-13 19:56:57 +02:00
nvmem
…
of
earlycon: prevent multiple register_console()
2022-06-30 17:10:11 +02:00
opp
OPP updates for 5.19-rc1
2022-05-25 15:02:26 +02:00
parisc
…
parport
…
pci
Driver core changes for 5.19-rc1
2022-06-03 11:48:47 -07:00
pcmcia
ARM: multiplatform changes, part 2
2022-06-02 15:23:54 -07:00
peci
…
perf
arm64 updates for 5.19:
2022-05-23 21:06:11 -07:00
phy
phy-for-5.19
2022-05-19 16:56:17 +02:00
pinctrl
Pin control bulk changes for the v5.19 series:
2022-05-28 11:15:54 -07:00
platform
platform-drivers-x86 for v5.19-2
2022-06-12 11:33:42 -07:00
pnp
…
power
Char / Misc / Other smaller driver subsystem updates for 5.19-rc1
2022-06-03 11:36:34 -07:00
powercap
Merge branches 'pm-em' and 'pm-cpuidle'
2022-05-23 19:18:51 +02:00
pps
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ps3
…
ptp
ptp: ptp_clockmatrix: fix is_single_shot
2022-05-25 21:51:32 -07:00
pwm
pwm: pwm-cros-ec: Add channel type support
2022-05-20 16:40:01 +02:00
rapidio
…
ras
…
regulator
Merge back reboot/poweroff notifiers rework for 5.19-rc1.
2022-05-25 14:38:29 +02:00
remoteproc
…
reset
…
rpmsg
Driver core changes for 5.19-rc1
2022-06-03 11:48:47 -07:00
rtc
ARM: multiplatform changes, part 2
2022-06-02 15:23:54 -07:00
s390
Driver core changes for 5.19-rc1
2022-06-03 11:48:47 -07:00
sbus
…
scsi
scsi: pmcraid: Fix missing resource cleanup in error case
2022-06-07 22:05:14 -04:00
sh
…
siox
…
slimbus
Driver core changes for 5.19-rc1
2022-06-03 11:48:47 -07:00
soc
Char / Misc / Other smaller driver subsystem updates for 5.19-rc1
2022-06-03 11:36:34 -07:00
soundwire
…
spi
Driver core changes for 5.19-rc1
2022-06-03 11:48:47 -07:00
spmi
…
ssb
…
staging
staging: rtl8723bs: Allocate full pwep structure
2022-06-10 09:10:16 +02:00
target
blk-mq: remove the done argument to blk_execute_rq_nowait
2022-05-28 06:15:27 -06:00
tc
…
tee
Fix a compiler warning in OP-TEE driver
2022-05-30 14:44:27 +02:00
thermal
Additional thermal control update for 5.19-rc1
2022-05-30 11:34:13 -07:00
thunderbolt
USB / Thunderbolt changes for 5.19-rc1
2022-06-03 11:17:49 -07:00
tty
serial: 8250_dw: Avoid pslverr on reading empty receiver fifo
2022-07-14 16:33:35 +02:00
ufs
SCSI misc on 20220604
2022-06-05 09:25:12 -07:00
uio
…
usb
tty/vt: consolemap: rename struct vc_data::vc_uni_pagedir*
2022-06-27 14:17:12 +02:00
vdpa
vduse: Fix NULL pointer dereference on sysfs access
2022-06-08 08:56:03 -04:00
vfio
VFIO updates for v5.19-rc1
2022-06-01 13:49:15 -07:00
vhost
vdpa: make get_vq_group and set_group_asid optional
2022-06-09 00:26:35 -04:00
video
tty/vt: consolemap: rename struct vc_data::vc_uni_pagedir*
2022-06-27 14:17:12 +02:00
virt
Char / Misc / Other smaller driver subsystem updates for 5.19-rc1
2022-06-03 11:36:34 -07:00
virtio
virtio,vdpa: fixes
2022-06-11 16:32:47 -07:00
vlynq
…
vme
…
w1
…
watchdog
watchdog: gxp: Add missing MODULE_LICENSE
2022-06-09 12:20:34 +02:00
xen
xen: unexport __init-annotated xen_xlate_map_ballooned_pages()
2022-06-07 08:11:35 +02:00
zorro
…
Kconfig
SCSI misc on 20220604
2022-06-05 09:25:12 -07:00
Makefile
SCSI misc on 20220604
2022-06-05 09:25:12 -07:00