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kernel_samsung_a53x/drivers/tty/serial
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Pavel Krasavin 333aaae423 tty: serial: meson: fix hard LOCKUP on crtscts mode 
[ Upstream commit 2a1d728f20edeee7f26dc307ed9df4e0d23947ab ]

There might be hard lockup if we set crtscts mode on port without RTS/CTS configured:

# stty -F /dev/ttyAML6 crtscts; echo 1 > /dev/ttyAML6; echo 2 > /dev/ttyAML6
[   95.890386] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[   95.890857] rcu:     3-...0: (201 ticks this GP) idle=e33c/1/0x4000000000000000 softirq=5844/5846 fqs=4984
[   95.900212] rcu:     (detected by 2, t=21016 jiffies, g=7753, q=296 ncpus=4)
[   95.906972] Task dump for CPU 3:
[   95.910178] task:bash            state:R  running task     stack:0     pid:205   ppid:1      flags:0x00000202
[   95.920059] Call trace:
[   95.922485]  __switch_to+0xe4/0x168
[   95.925951]  0xffffff8003477508
[   95.974379] watchdog: Watchdog detected hard LOCKUP on cpu 3
[   95.974424] Modules linked in: 88x2cs(O) rtc_meson_vrtc

Possible solution would be to not allow to setup crtscts on such port.

Tested on S905X3 based board.

Fixes: ff7693d079e5 ("ARM: meson: serial: add MesonX SoC on-chip uart driver")
Cc: stable@vger.kernel.org
Signed-off-by: Pavel Krasavin <pkrasavin@imaqliq.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Dmitry Rokosov <ddrokosov@salutedevices.com>

v6: stable tag added
v5: https://lore.kernel.org/lkml/OF43DA36FF.2BD3BB21-ON00258A47.005A8125-00258A47.005A9513@gdc.ru/
added missed Reviewed-by tags, Fixes tag added according to Dmitry and Neil notes
v4: https://lore.kernel.org/lkml/OF55521400.7512350F-ON00258A47.003F7254-00258A47.0040E15C@gdc.ru/
More correct patch subject according to Jiri's note
v3: https://lore.kernel.org/lkml/OF6CF5FFA0.CCFD0E8E-ON00258A46.00549EDF-00258A46.0054BB62@gdc.ru/
"From:" line added to the mail
v2: https://lore.kernel.org/lkml/OF950BEF72.7F425944-ON00258A46.00488A76-00258A46.00497D44@gdc.ru/
braces for single statement removed according to Dmitry's note
v1: https://lore.kernel.org/lkml/OF28B2B8C9.5BC0CD28-ON00258A46.0037688F-00258A46.0039155B@gdc.ru/
Link: https://lore.kernel.org/r/OF66360032.51C36182-ON00258A48.003F656B-00258A48.0040092C@gdc.ru

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-11-18 11:43:26 +01:00
..
8250 tty: 8250: Add support for Intashield IS-100 2024-11-18 10:58:48 +01:00
cpm_uart Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
jsm Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
21285.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
altera_jtaguart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
altera_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
amba-pl010.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
amba-pl011.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
amba-pl011.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
apbuart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
apbuart.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ar933x_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
arc_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
atmel_serial.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
atmel_serial.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bcm63xx_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
clps711x.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
digicolor-usart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
dz.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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earlycon-arm-semihost.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
earlycon-riscv-sbi.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
earlycon.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
efm32-uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
exynos_tty.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
exynos_tty.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fsl_linflexuart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fsl_lpuart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
icom.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
icom.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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imx.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
imx_earlycon.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip22zilog.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ip22zilog.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kgdb_nmi.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kgdboc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
lantiq.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
lpc32xx_hs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Makefile Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
max310x.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
max3100.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mcf.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
men_z135_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
meson_uart.c tty: serial: meson: fix hard LOCKUP on crtscts mode 2024-11-18 11:43:26 +01:00
milbeaut_usio.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mpc52xx_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mps2-uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
msm_geni_serial_earlycon.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
msm_serial.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mux.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mvebu-uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mxs-auart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
omap-serial.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
owl-uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pch_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pic32_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pic32_uart.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pmac_zilog.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pmac_zilog.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pnx8xxx_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
pxa.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
qcom_geni_serial.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rda-uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rp2.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sa1100.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
samsung_tty.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sb1250-duart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sc16is7xx.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sccnxp.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
serial-tegra.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
serial_core.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
serial_mctrl_gpio.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
serial_mctrl_gpio.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
serial_txx9.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sh-sci.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sh-sci.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sifive.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sirfsoc_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sirfsoc_uart.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sprd_serial.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
st-asc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
stm32-usart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
stm32-usart.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
suncore.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sunhv.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sunsab.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sunsab.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sunsu.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sunzilog.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sunzilog.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tegra-tcu.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
timbuart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
timbuart.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
uartlite.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ucc_uart.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
vr41xx_siu.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
vt8500_serial.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
xilinx_uartps.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
zs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
zs.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00