[PATCH 26/26] serial: xilinx_uartps: drop low-latency workaround

Johan Hovold
2021-04-21T09:57:45Z

Commit c8dbdc842d30 ("serial: xuartps: Rewrite the interrupt handling
logic") reworked the driver interrupt processing but also, without
comment, added an unnecessary workaround for the infamous low_latency
behaviour of tty_flip_buffer_push() which had been removed years
before.

Specifically, since commit a9c3f68f3cd8 ("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.

Cc: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/tty/serial/xilinx_uartps.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index a14c5d996473..67a2db621e2b 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -301,9 +301,8 @@ static void cdns_uart_handle_rx(void *dev_id, unsigned int isrstatus)
tty_insert_flip_char(&port->state->port, data, status);
isrstatus = 0;
}
- spin_unlock(&port->lock);
+
tty_flip_buffer_push(&port->state->port);
- spin_lock(&port->lock);
}

/**
--
2.26.3