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linux-stable/drivers/tty/serial
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Johan Hovold 75f4e830fa serial: do not restore interrupt state in sysrq helper 
The uart_unlock_and_check_sysrq() helper can be used to defer processing
of sysrq until the interrupt handler has released the port lock and is
about to return.

Since commit 81e2073c17 ("genirq: Disable interrupts for force
threaded handlers") interrupt handlers that are not explicitly requested
as threaded are always called with interrupts disabled and there is no
need to save the interrupt state when taking the port lock.

Instead of adding another sysrq helper for when the interrupt state has
not needlessly been saved, drop the state parameter from
uart_unlock_and_check_sysrq() and update its callers to no longer
explicitly disable interrupts in their interrupt handlers.

Cc: Joel Stanley <joel@jms.id.au>
Cc: Andrew Jeffery <andrew@aj.id.au>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210416140557.25177-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-04-22 12:04:26 +02:00
..
8250 serial: do not restore interrupt state in sysrq helper 2021-04-22 12:04:26 +02:00
cpm_uart tty: cpm_uart, use port->flags instead of low_latency 2021-01-07 16:17:31 +01:00
jsm Merge 5.12-rc6 into tty-next 2021-04-05 08:59:21 +02:00
21285.c tty: serial: 21285: fix lockup on open 2020-10-28 13:39:14 +01:00
altera_jtaguart.c serial: altera_jtaguart: Replace HTTP links with HTTPS ones 2020-07-21 20:04:54 +02:00
altera_uart.c
amba-pl010.c amba: Make the remove callback return void 2021-02-02 14:25:50 +01:00
amba-pl011.c amba: Make the remove callback return void 2021-02-02 14:25:50 +01:00
amba-pl011.h
apbuart.c
apbuart.h
ar933x_uart.c serial: ar933x_uart: disable clk on error handling path in probe 2020-11-12 09:41:07 +01:00
arc_uart.c
atmel_serial.c Linux 5.9-rc3 2020-08-31 07:19:25 +02:00
atmel_serial.h
bcm63xx_uart.c
clps711x.c
digicolor-usart.c
dz.c
dz.h
earlycon-arm-semihost.c
earlycon-riscv-sbi.c
earlycon.c earlycon: simplify earlycon-table implementation 2020-12-04 15:49:48 +01:00
fsl_linflexuart.c tty: serial: linflexuart: Remove unnecessary '|' operation and add error count 2020-11-06 17:12:30 +01:00
fsl_lpuart.c serial: fsl_lpuart: Use of_device_get_match_data() 2021-01-20 18:48:15 +01:00
icom.c module: remove never implemented MODULE_SUPPORTED_DEVICE 2021-03-17 13:16:18 -07:00
icom.h
imx.c serial: imx: drop workaround for forced irq threading 2021-03-23 10:32:44 +01:00
imx_earlycon.c tty: serial: imx: add imx earlycon driver 2020-07-29 17:11:02 +02:00
ip22zilog.c
ip22zilog.h
Kconfig tty: serial: samsung_tty: Add support for Apple UARTs 2021-03-10 09:34:10 +01:00
kgdb_nmi.c tty: do not check tty_unregister_driver's return value 2021-03-10 09:34:09 +01:00
kgdboc.c
lantiq.c tty/serial/lantiq: convert comma to semicolon 2020-12-28 16:10:50 +01:00
liteuart.c serial: liteuart: fix return value check in liteuart_probe() 2021-03-10 09:34:10 +01:00
lpc32xx_hs.c tty: serial: lpc32xx_hs: Remove unused variable 'tmp' 2020-11-06 10:54:04 +01:00
Makefile serial: ifx6x60: Remove driver for deprecated platform 2021-01-26 19:21:49 +01:00
max310x.c tty: max310x: fix flexible_array.cocci warnings 2021-03-23 10:24:27 +01:00
max3100.c tty_port: drop last traces of low_latency 2021-01-07 16:17:32 +01:00
mcf.c serial: mcf: add sysrq capability 2020-10-05 13:32:30 +02:00
men_z135_uart.c tty: serial, fix kernel-doc 2020-08-18 13:51:18 +02:00
meson_uart.c tty: serial: meson: enable console as module 2020-12-11 17:14:22 +01:00
milbeaut_usio.c
mpc52xx_uart.c
mps2-uart.c
msm_serial.c tty: serial: msm_serial: Constify msm_uart_pops 2020-11-06 17:16:36 +01:00
mux.c
mvebu-uart.c serial: mvebu-uart: fix tx lost characters at power off 2020-12-28 16:17:34 +01:00
mxs-auart.c serial: mxs-auart: Remove <asm/cacheflush.h> 2021-01-20 18:48:19 +01:00
omap-serial.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
owl-uart.c tty: serial: owl: Add support for kernel debugger 2021-01-13 17:16:54 +01:00
pch_uart.c serial: pch_uart: fix build error with !CONFIG_DEBUG_FS 2021-03-23 10:31:09 +01:00
pic32_uart.c
pic32_uart.h
pmac_zilog.c m68k: Fix WARNING splat in pmac_zilog driver 2020-11-23 11:31:00 +01:00
pmac_zilog.h tty: serial: pmac_zilog: Remove unused disposable variable 'garbage' 2020-11-13 15:28:27 +01:00
pxa.c
qcom_geni_serial.c serial: do not restore interrupt state in sysrq helper 2021-04-22 12:04:26 +02:00
rda-uart.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
rp2.c
sa1100.c serial: sa1100: use platform_get_resource() 2020-08-18 15:02:06 +02:00
samsung_tty.c tty: serial: samsung_tty: remove spinlock flags in interrupt handlers 2021-03-23 10:20:38 +01:00
sb1250-duart.c MIPS: Replace SIBYTE_1956_WAR by CONFIG_SB1_PASS_2_WORKAROUNDS 2020-09-07 22:24:51 +02:00
sc16is7xx.c sc16is7xx: Defer probe if device read fails 2021-04-05 12:07:32 +02:00
sccnxp.c
serial-tegra.c tty: serial: serial-tegra: Provide some missing struct member descriptions 2020-11-06 10:54:05 +01:00
serial_core.c serial: core: return early on unsupported ioctls 2021-04-10 10:36:34 +02:00
serial_mctrl_gpio.c serial: mctrl_gpio: Fix passing zero to 'ERR_PTR' warning 2020-11-06 17:12:05 +01:00
serial_mctrl_gpio.h
serial_txx9.c serial: txx9: add missing platform_driver_unregister() on error in serial_txx9_init 2020-11-06 17:24:41 +01:00
sh-sci.c serial: sh-sci: remove obsolete latency workaround 2021-04-15 12:59:16 +02:00
sh-sci.h
sifive.c riscv: Fix sifive serial driver 2021-01-07 18:02:13 -08:00
sprd_serial.c
st-asc.c
stm32-usart.c tty/serial: Add rx-tx-swap OF option to stm32-usart 2021-04-05 12:06:52 +02:00
stm32-usart.h tty/serial: Add rx-tx-swap OF option to stm32-usart 2021-04-05 12:06:52 +02:00
suncore.c
sunhv.c Revert "serial: sunhv: Initialize lock for non-registered console" 2020-07-21 18:21:49 +02:00
sunsab.c
sunsab.h
sunsu.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
sunzilog.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
sunzilog.h
tegra-tcu.c serial: Add missing MODULE_DEVICE_TABLE 2021-04-10 10:37:27 +02:00
timbuart.c tty: timbuart: convert tasklets to use new tasklet_setup() API 2020-08-18 13:33:13 +02:00
timbuart.h
uartlite.c tty: serial: uartlite: Support probe deferral 2020-12-04 16:51:40 +01:00
ucc_uart.c serial: ucc_uart: make qe_uart_set_mctrl() static 2020-09-16 13:14:58 +02:00
vr41xx_siu.c
vt8500_serial.c
xilinx_uartps.c tty: serial: xilinx_uartps: Supply description for missing member 'cts_override' 2020-11-06 10:54:05 +01:00
zs.c
zs.h