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serial: mpc52xx_uart: drop low-latency workaround

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Commit fbe543b412 ("Fix a potential issue in mpc52xx uart driver")
worked around the infamous low_latency behaviour of
tty_flip_buffer_push() by simply dropping and reacquiring the port lock
in the interrupt handler.

Since commit a9c3f68f3c ("tty: Fix low_latency BUG"),
tty_flip_buffer_push() always schedules a work item to push data to the
line discipline and there's no need to keep any low_latency hacks around.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210421095509.3024-16-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2021-04-21 11:54:58 +02:00 committed by Greg Kroah-Hartman
parent b8555963ca
commit 6e560913aa
1 changed files with 0 additions and 2 deletions
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2
drivers/tty/serial/mpc52xx_uart.c
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@ -1421,9 +1421,7 @@ mpc52xx_uart_int_rx_chars(struct uart_port *port)
}
}
spin_unlock(&port->lock);
tty_flip_buffer_push(tport);
spin_lock(&port->lock);
return psc_ops->raw_rx_rdy(port);
}