linux-kernel - [PATCH v6 09/14] serial: liteuart: clean up rx loop variables

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Message-Id: <20221123130500.1030189-10-gsomlo@gmail.com>
Date:   Wed, 23 Nov 2022 08:04:55 -0500
From:   Gabriel Somlo <gsomlo@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, kgugala@...micro.com, mholenko@...micro.com,
        joel@....id.au, david.abdurachmanov@...il.com,
        florent@...oy-digital.fr, geert@...ux-m68k.org,
        ilpo.jarvinen@...ux.intel.com
Subject: [PATCH v6 09/14] serial: liteuart: clean up rx loop variables

The `status` variable will always be `1` when passed into the call
to `uart_insert_char()`, so it can be eliminated altogether.

Use `u8` as the type for `ch`, as it matches the return type of
the `litex_read8()` call which produces its value.

Signed-off-by: Gabriel Somlo <gsomlo@...il.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---

Changes from v5:
  - removing `status` variable altogether
  - using `u8` for `ch`, matching the type of the call producing it
    rather than that of the calls that consume its value

 drivers/tty/serial/liteuart.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c
index 81aa7c1da73c..62bfd2ed9051 100644
--- a/drivers/tty/serial/liteuart.c
+++ b/drivers/tty/serial/liteuart.c
@@ -73,10 +73,9 @@ static void liteuart_timer(struct timer_list *t)
 	struct liteuart_port *uart = from_timer(uart, t, timer);
 	struct uart_port *port = &uart->port;
 	unsigned char __iomem *membase = port->membase;
-	int ch;
-	unsigned long status;
+	u8 ch;
 
-	while ((status = !litex_read8(membase + OFF_RXEMPTY)) == 1) {
+	while (!litex_read8(membase + OFF_RXEMPTY)) {
 		ch = litex_read8(membase + OFF_RXTX);
 		port->icount.rx++;
 
@@ -85,7 +84,7 @@ static void liteuart_timer(struct timer_list *t)
 
 		/* no overflow bits in status */
 		if (!(uart_handle_sysrq_char(port, ch)))
-			uart_insert_char(port, status, 0, ch, TTY_NORMAL);
+			uart_insert_char(port, 1, 0, ch, TTY_NORMAL);
 	}
 
 	tty_flip_buffer_push(&port->state->port);
-- 
2.38.1