Geert Uytterhoeven 62570d2476 serial: sh-sci: Fix race condition causing garbage during shutdown ...

[ Upstream commit 1cf4a7efdc ]

If DMA is enabled and used, a burst of old data may be seen on the
serial console during "poweroff" or "reboot".  uart_flush_buffer()
clears the circular buffer, but sci_port.tx_dma_len is not reset.
This leads to a circular buffer overflow, dumping (UART_XMIT_SIZE -
sci_port.tx_dma_len) bytes.

To fix this, add a .flush_buffer() callback that resets
sci_port.tx_dma_len.

Inspired by commit 31ca2c63fd ("tty/serial: atmel: fix race
condition (TX+DMA)").

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-04-13 19:50:07 +02:00

..

hvc

tty: hvc_xen: hide xen_console_remove when unused

2018-02-25 11:03:46 +01:00

ipwireless

…

serial

serial: sh-sci: Fix race condition causing garbage during shutdown

2018-04-13 19:50:07 +02:00

vt

vt: change SGR 21 to follow the standards

2018-04-08 11:52:01 +02:00

amiserial.c

…

bfin_jtag_comm.c

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cyclades.c

tty: Remove ASYNC_CLOSING checks in open()/hangup() methods

2015-10-17 21:11:29 -07:00

ehv_bytechan.c

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goldfish.c

Revert "tty: goldfish: Fix a parameter of a call to free_irq"

2017-10-21 17:09:06 +02:00

isicom.c

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Kconfig

tty: cyclades: cyz_interrupt is only used for PCI

2018-02-25 11:03:48 +01:00

Makefile

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metag_da.c

…

mips_ejtag_fdc.c

ttyFDC: Fix build problems due to use of module_{init,exit}

2015-10-17 21:29:21 -07:00

moxa.c

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moxa.h

…

mxser.c

…

mxser.h

…

n_gsm.c

TTY: n_gsm, fix false positive WARN_ON

2016-06-01 12:15:52 -07:00

n_hdlc.c

tty: n_hdlc: get rid of racy n_hdlc.tbuf

2017-03-15 09:57:10 +08:00

n_r3964.c

tty: r3964: Replace/remove bogus tty lock use

2015-10-17 21:11:29 -07:00

n_tracerouter.c

n_tracerouter: stop including <asm-generic/bug>

2015-10-15 00:21:10 +02:00

n_tracesink.c

n_tracesink: stop including <asm-generic/bug>

2015-10-15 00:21:11 +02:00

n_tracesink.h

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n_tty.c

n_tty: fix EXTPROC vs ICANON interaction with TIOCINQ (aka FIONREAD)

2018-01-02 20:33:28 +01:00

nozomi.c

tty: nozomi: avoid a harmless gcc warning

2017-04-30 05:49:27 +02:00

pty.c

tty: pty: Fix ldisc flush after userspace become aware of the data already

2017-05-20 14:27:02 +02:00

rocket_int.h

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rocket.c

tty: Remove tty_port::close_wait

2015-10-17 21:11:29 -07:00

rocket.h

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synclink_gt.c

tty: Remove ASYNC_CLOSING checks in open()/hangup() methods

2015-10-17 21:11:29 -07:00

synclink.c

tty: synclink, fix indentation

2015-10-17 21:14:06 -07:00

synclinkmp.c

tty: Remove ASYNC_CLOSING checks in open()/hangup() methods

2015-10-17 21:11:29 -07:00

sysrq.c

sysrq: Fix warning in sysrq generated crash.

2018-01-17 09:35:28 +01:00

tty_audit.c

tty: audit: Fix audit source

2015-11-20 16:19:54 -08:00

tty_buffer.c

tty: fix __tty_insert_flip_char regression

2017-09-27 11:00:13 +02:00

tty_io.c

pty: cancel pty slave port buf's work in tty_release

2018-03-24 10:58:48 +01:00

tty_ioctl.c

tty: Fix tty_send_xchar() lock order inversion

2015-11-20 16:19:54 -08:00

tty_ldisc.c

tty: Prevent ldisc drivers from re-using stale tty fields

2016-11-21 10:06:40 +01:00

tty_ldsem.c

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tty_mutex.c

tty: Drop krefs for interrupted tty lock

2017-06-14 13:16:26 +02:00

tty_port.c

tty: Abstract tty buffer work

2015-10-17 21:32:21 -07:00