linux-kernel - [PATCH 29/58] tty/serial: Migrate pch_uart to use has

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Date:   Fri, 13 Dec 2019 00:06:28 +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
Subject: [PATCH 29/58] tty/serial: Migrate pch_uart 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.

Signed-off-by: Dmitry Safonov <dima@...sta.com>
---
 drivers/tty/serial/pch_uart.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index c16234bca78f..c625bf7b8a92 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -2,9 +2,6 @@
 /*
  *Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
  */
-#if defined(CONFIG_SERIAL_PCH_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
 #include <linux/kernel.h>
 #include <linux/serial_reg.h>
 #include <linux/slab.h>
@@ -587,12 +584,10 @@ static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
 			if (uart_handle_break(port))
 				continue;
 		}
-#ifdef SUPPORT_SYSRQ
 		if (port->sysrq) {
 			if (uart_handle_sysrq_char(port, rbr))
 				continue;
 		}
-#endif
 
 		buf[i++] = rbr;
 	}
@@ -1796,6 +1791,7 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 	priv->port.flags = UPF_BOOT_AUTOCONF;
 	priv->port.fifosize = fifosize;
 	priv->port.line = board->line_no;
+	priv->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PCH_UART_CONSOLE);
 	priv->trigger = PCH_UART_HAL_TRIGGER_M;
 
 	snprintf(priv->irq_name, IRQ_NAME_SIZE,
-- 
2.24.0