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linux/drivers/tty
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Valentin Caron 335f11ff74 serial: stm32: prevent TDR register overwrite when sending x_char 
[ Upstream commit d3d079bde07e1b7deaeb57506dc0b86010121d17 ]

When sending x_char in stm32_usart_transmit_chars(), driver can overwrite
the value of TDR register by the value of x_char. If this happens, the
previous value that was present in TDR register will not be sent through
uart.

This code checks if the previous value in TDR register is sent before
writing the x_char value into register.

Fixes: 48a6092fb41f ("serial: stm32-usart: Add STM32 USART Driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Link: https://lore.kernel.org/r/20220111164441.6178-2-valentin.caron@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-03-08 19:09:30 +01:00
..
hvc
xen/console: harden hvc_xen against event channel storms
2021-12-22 09:30:59 +01:00
ipwireless
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serdev
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serial
serial: stm32: prevent TDR register overwrite when sending x_char
2022-03-08 19:09:30 +01:00
vt
vt_ioctl: add array_index_nospec to VT_ACTIVATE
2022-02-16 12:54:27 +01:00
amiserial.c
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cyclades.c
…
ehv_bytechan.c
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goldfish.c
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isicom.c
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Kconfig
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Makefile
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mips_ejtag_fdc.c
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moxa.c
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moxa.h
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mxser.c
…
mxser.h
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n_gsm.c
tty: n_gsm: fix deadlock in gsmtty_open()
2022-03-02 11:42:57 +01:00
n_hdlc.c
tty: n_hdlc: make n_hdlc_tty_wakeup() asynchronous
2021-12-22 09:30:56 +01:00
n_null.c
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n_r3964.c
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n_tracerouter.c
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n_tracesink.c
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n_tracesink.h
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n_tty.c
tty: n_tty: do not look ahead for EOL character past the end of the buffer
2022-02-23 12:01:04 +01:00
nozomi.c
tty: nozomi: Fix the error handling path of 'nozomi_card_init()'
2021-07-14 16:56:39 +02:00
pty.c
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rocket_int.h
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rocket.c
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rocket.h
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synclink_gt.c
tty: synclink_gt: rename a conflicting function name
2021-09-30 10:11:03 +02:00
synclink.c
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synclinkmp.c
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sysrq.c
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tty_audit.c
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tty_baudrate.c
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tty_buffer.c
tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc
2021-11-26 10:39:10 +01:00
tty_io.c
tty: Fix data race between tiocsti() and flush_to_ldisc()
2021-09-15 09:50:47 +02:00
tty_ioctl.c
tty: fix return value for unsupported termiox ioctls
2021-05-14 09:50:19 +02:00
tty_jobctrl.c
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tty_ldisc.c
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tty_ldsem.c
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tty_mutex.c
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tty_port.c
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ttynull.c
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vcc.c
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