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twx-linux/drivers/tty/serial
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Fugang Duan 123667ed90 tty: serial: imx: keep console clocks always on 
commit e67c139c48 upstream.

For below code, there has chance to cause deadlock in SMP system:
Thread 1:
clk_enable_lock();
pr_info("debug message");
clk_enable_unlock();

Thread 2:
imx_uart_console_write()
	clk_enable()
		clk_enable_lock();

Thread 1:
Acuired clk enable_lock -> printk -> console_trylock_spinning
Thread 2:
console_unlock() -> imx_uart_console_write -> clk_disable -> Acquite clk enable_lock

So the patch is to keep console port clocks always on like
other console drivers.

Fixes: 1cf93e0d54 ("serial: imx: remove the uart_console() check")
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Link: https://lore.kernel.org/r/20201111025136.29818-1-fugang.duan@nxp.com
Cc: stable <stable@vger.kernel.org>
[fix up build warning - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-11-24 13:27:24 +01:00
..
8250
serial: 8250_mtk: Fix uart_get_baud_rate warning
2020-11-10 12:36:00 +01:00
cpm_uart
…
jsm
…
21285.c
…
altera_jtaguart.c
…
altera_uart.c
…
amba-pl010.c
…
amba-pl011.c
serial: pl011: Fix lockdep splat when handling magic-sysrq interrupt
2020-11-05 11:08:34 +01:00
amba-pl011.h
…
apbuart.c
…
apbuart.h
…
ar933x_uart.c
serial: ar933x_uart: set UART_CS_{RX,TX}_READY_ORIDE
2020-03-11 14:14:48 +01:00
arc_uart.c
…
atmel_serial.c
tty/serial: atmel: manage shutdown in case of RS485 or ISO7816 mode
2020-02-28 16:38:48 +01:00
atmel_serial.h
…
bcm63xx_uart.c
…
clps711x.c
…
digicolor-usart.c
…
dz.c
…
dz.h
…
earlycon-arm-semihost.c
…
earlycon.c
…
efm32-uart.c
…
fsl_lpuart.c
tty: serial: fsl_lpuart: fix lpuart32_poll_get_char
2020-10-30 10:38:32 +01:00
icom.c
…
icom.h
…
ifx6x60.c
serial: ifx6x60: add missed pm_runtime_disable
2019-12-13 08:51:01 +01:00
ifx6x60.h
…
imx.c
tty: serial: imx: keep console clocks always on
2020-11-24 13:27:24 +01:00
ioc3_serial.c
…
ioc4_serial.c
…
ip22zilog.c
…
ip22zilog.h
…
Kconfig
tty: serial: earlycon dependency
2020-10-29 09:55:08 +01:00
kgdb_nmi.c
…
kgdboc.c
…
lantiq.c
…
lpc32xx_hs.c
…
Makefile
…
max310x.c
serial: max310x: Fix tx_empty() callback
2019-12-05 09:20:40 +01:00
max3100.c
…
mcf.c
…
men_z135_uart.c
…
meson_uart.c
…
mpc52xx_uart.c
…
mps2-uart.c
…
mpsc.c
…
msm_serial.c
tty: serial: msm_serial: Fix lockup for sysrq and oops
2020-01-09 10:19:06 +01:00
mux.c
…
mvebu-uart.c
tty:serial:mvebu-uart:fix a wrong return
2020-03-11 14:15:01 +01:00
mxs-auart.c
serial: mxs-auart: add missed iounmap() in probe failure and remove
2020-07-22 09:32:10 +02:00
netx-serial.c
…
omap-serial.c
…
owl-uart.c
tty: serial: owl: Fix the link time qualifier of 'owl_uart_exit()'
2019-11-06 13:05:49 +01:00
pch_uart.c
PCI: Move Rohm Vendor ID to generic list
2020-06-22 09:05:23 +02:00
pic32_uart.c
…
pic32_uart.h
…
pmac_zilog.c
…
pmac_zilog.h
…
pnx8xxx_uart.c
…
pxa.c
…
qcom_geni_serial.c
tty: serial: qcom_geni_serial: Drop __init from qcom_geni_console_setup
2020-09-09 19:04:23 +02:00
rp2.c
…
sa1100.c
…
samsung.c
tty: serial: samsung: Correct clock selection logic
2020-10-01 13:14:44 +02:00
samsung.h
…
sb1250-duart.c
…
sc16is7xx.c
sc16is7xx: Fix for "Unexpected interrupt: 8"
2019-11-06 13:05:15 +01:00
sccnxp.c
…
serial_core.c
tty: link tty and port before configuring it as console
2020-01-14 20:07:05 +01:00
serial_ks8695.c
…
serial_mctrl_gpio.c
serial: mctrl_gpio: Check for NULL pointer
2019-11-06 13:05:52 +01:00
serial_mctrl_gpio.h
…
serial_txx9.c
serial: txx9: add missing platform_driver_unregister() on error in serial_txx9_init
2020-11-10 12:36:00 +01:00
serial-tegra.c
…
sh-sci.c
serial: sh-sci: Make sure status register SCxSR is read in correct sequence
2020-04-29 16:31:34 +02:00
sh-sci.h
…
sirfsoc_uart.c
…
sirfsoc_uart.h
…
sn_console.c
…
sprd_serial.c
…
st-asc.c
…
stm32-usart.c
serial: stm32: fix clearing interrupt error flags
2020-01-27 14:51:22 +01:00
stm32-usart.h
serial: stm32: fix rx data length when parity enabled
2020-01-27 14:50:50 +01:00
suncore.c
…
sunhv.c
…
sunsab.c
…
sunsab.h
…
sunsu.c
…
sunzilog.c
…
sunzilog.h
…
timbuart.c
…
timbuart.h
…
uartlite.c
serial: uartlite: fix exit path null pointer
2019-10-17 13:45:00 -07:00
ucc_uart.c
…
vr41xx_siu.c
…
vt8500_serial.c
…
xilinx_uartps.c
serial: uartps: Wait for tx_empty in console setup
2020-10-01 13:14:42 +02:00
zs.c
…
zs.h
…