linux-kernel - [PATCH 12/58] tty/serial: Migrate atmel_serial to use has

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Date:   Fri, 13 Dec 2019 00:06:11 +0000
From:   Dmitry Safonov <dima@...sta.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Dmitry Safonov <dima@...sta.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Vasiliy Khoruzhick <vasilykh@...sta.com>,
        linux-serial@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Richard Genoud <richard.genoud@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 12/58] tty/serial: Migrate atmel_serial to use has_sysrq

The SUPPORT_SYSRQ ifdeffery is not nice as:
- May create misunderstanding about sizeof(struct uart_port) between
  different objects
- Prevents moving functions from serial_core.h
- Reduces readability (well, it's ifdeffery - it's hard to follow)

In order to remove SUPPORT_SYSRQ, has_sysrq variable has been added.
Initialise it in driver's probe and remove ifdeffery.

While at it, remove forward-declaration of atmel_console - it wasn't
needed even at the moment the driver was first time introduced:
commit 1e6c9c2878c9 ("[ARM] 3242/2: AT91RM9200 support for 2.6 (Serial)")

Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: Ludovic Desroches <ludovic.desroches@...rochip.com>
Cc: Richard Genoud <richard.genoud@...il.com>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Dmitry Safonov <dima@...sta.com>
---
 drivers/tty/serial/atmel_serial.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index a8dc8af83f39..4020fc8ceb49 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -51,10 +51,6 @@
 #define ATMEL_RTS_HIGH_OFFSET	16
 #define ATMEL_RTS_LOW_OFFSET	20
 
-#if defined(CONFIG_SERIAL_ATMEL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
 #include <linux/serial_core.h>
 
 #include "serial_mctrl_gpio.h"
@@ -196,10 +192,6 @@ struct atmel_uart_port {
 static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART];
 static DECLARE_BITMAP(atmel_ports_in_use, ATMEL_MAX_UART);
 
-#ifdef SUPPORT_SYSRQ
-static struct console atmel_console;
-#endif
-
 #if defined(CONFIG_OF)
 static const struct of_device_id atmel_serial_dt_ids[] = {
 	{ .compatible = "atmel,at91rm9200-usart-serial" },
@@ -2877,6 +2869,7 @@ static int atmel_serial_probe(struct platform_device *pdev)
 	atmel_port = &atmel_ports[ret];
 	atmel_port->backup_imr = 0;
 	atmel_port->uart.line = ret;
+	atmel_port->uart.has_sysrq = IS_ENABLED(CONFIG_SERIAL_ATMEL_CONSOLE);
 	atmel_serial_probe_fifos(atmel_port, pdev);
 
 	atomic_set(&atmel_port->tasklet_shutdown, 0);
-- 
2.24.0