serial: 8250_dw: Allow TX FIFO to drain before writing to UART_LCR

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An issue has been observed on the Marvell Armada 38x serial port.

Writes to UART_LCR can result in characters that are currently held in the
TX FIFO being lost rather than sent, even if the userspace process has
attempted to flush them.

This is most visible when using the "resize" command (tested on Busybox),
where we have observed the escape code for restoring cursor position
becoming mangled.

Signed-off-by: Joshua Scott <joshua.scott@alliedtelesis.co.nz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Joshua Scott 2018-02-09 10:59:56 +13:00 • committed by Greg Kroah-Hartman

parent b96408b474

commit 914eaf935e

1 changed files with 18 additions and 0 deletions

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drivers/tty/serial/8250/8250_dw.c

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