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serial: meson: drop low-latency workaround

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The meson driver has always carried an unnecessary workaround for the
infamous low_latency behaviour of tty_flip_buffer_push(), which had
already been removed by the time the driver was added by commit
ff7693d079 ("ARM: meson: serial: add MesonX SoC on-chip uart driver").

Specifically, 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/20210421095509.3024-15-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2021-04-21 11:54:57 +02:00 committed by Greg Kroah-Hartman
parent 5d148754da
commit b8555963ca
1 changed files with 0 additions and 2 deletions
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2
drivers/tty/serial/meson_uart.c
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@ -226,9 +226,7 @@ static void meson_receive_chars(struct uart_port *port)
} while (!(readl(port->membase + AML_UART_STATUS) & AML_UART_RX_EMPTY));
spin_unlock(&port->lock);
tty_flip_buffer_push(tport);
spin_lock(&port->lock);
}
static irqreturn_t meson_uart_interrupt(int irq, void *dev_id)