From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 14 Sep 2023 20:44:22 +0206
Subject: [PATCH 065/134] serial: sunhv: Use port lock wrappers
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz

When a serial port is used for kernel console output, then all
modifications to the UART registers which are done from other contexts,
e.g. getty, termios, are interference points for the kernel console.

So far this has been ignored and the printk output is based on the
principle of hope. The rework of the console infrastructure which aims to
support threaded and atomic consoles, requires to mark sections which
modify the UART registers as unsafe. This allows the atomic write function
to make informed decisions and eventually to restore operational state. It
also allows to prevent the regular UART code from modifying UART registers
while printk output is in progress.

All modifications of UART registers are guarded by the UART port lock,
which provides an obvious synchronization point with the console
infrastructure.

To avoid adding this functionality to all UART drivers, wrap the
spin_[un]lock*() invocations for uart_port::lock into helper functions
which just contain the spin_[un]lock*() invocations for now. In a
subsequent step these helpers will gain the console synchronization
mechanisms.

Converted with coccinelle. No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Link: https://lore.kernel.org/r/20230914183831.587273-66-john.ogness@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/tty/serial/sunhv.c |   28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

--- a/drivers/tty/serial/sunhv.c
+++ b/drivers/tty/serial/sunhv.c
@@ -217,10 +217,10 @@ static irqreturn_t sunhv_interrupt(int i
 	struct tty_port *tport;
 	unsigned long flags;
 
-	spin_lock_irqsave(&port->lock, flags);
+	uart_port_lock_irqsave(port, &flags);
 	tport = receive_chars(port);
 	transmit_chars(port);
-	spin_unlock_irqrestore(&port->lock, flags);
+	uart_port_unlock_irqrestore(port, flags);
 
 	if (tport)
 		tty_flip_buffer_push(tport);
@@ -271,7 +271,7 @@ static void sunhv_send_xchar(struct uart
 	if (ch == __DISABLED_CHAR)
 		return;
 
-	spin_lock_irqsave(&port->lock, flags);
+	uart_port_lock_irqsave(port, &flags);
 
 	while (limit-- > 0) {
 		long status = sun4v_con_putchar(ch);
@@ -280,7 +280,7 @@ static void sunhv_send_xchar(struct uart
 		udelay(1);
 	}
 
-	spin_unlock_irqrestore(&port->lock, flags);
+	uart_port_unlock_irqrestore(port, flags);
 }
 
 /* port->lock held by caller.  */
@@ -295,7 +295,7 @@ static void sunhv_break_ctl(struct uart_
 		unsigned long flags;
 		int limit = 10000;
 
-		spin_lock_irqsave(&port->lock, flags);
+		uart_port_lock_irqsave(port, &flags);
 
 		while (limit-- > 0) {
 			long status = sun4v_con_putchar(CON_BREAK);
@@ -304,7 +304,7 @@ static void sunhv_break_ctl(struct uart_
 			udelay(1);
 		}
 
-		spin_unlock_irqrestore(&port->lock, flags);
+		uart_port_unlock_irqrestore(port, flags);
 	}
 }
 
@@ -328,7 +328,7 @@ static void sunhv_set_termios(struct uar
 	unsigned int iflag, cflag;
 	unsigned long flags;
 
-	spin_lock_irqsave(&port->lock, flags);
+	uart_port_lock_irqsave(port, &flags);
 
 	iflag = termios->c_iflag;
 	cflag = termios->c_cflag;
@@ -343,7 +343,7 @@ static void sunhv_set_termios(struct uar
 	uart_update_timeout(port, cflag,
 			    (port->uartclk / (16 * quot)));
 
-	spin_unlock_irqrestore(&port->lock, flags);
+	uart_port_unlock_irqrestore(port, flags);
 }
 
 static const char *sunhv_type(struct uart_port *port)
@@ -437,9 +437,9 @@ static void sunhv_console_write_paged(st
 	int locked = 1;
 
 	if (port->sysrq || oops_in_progress)
-		locked = spin_trylock_irqsave(&port->lock, flags);
+		locked = uart_port_trylock_irqsave(port, &flags);
 	else
-		spin_lock_irqsave(&port->lock, flags);
+		uart_port_lock_irqsave(port, &flags);
 
 	while (n > 0) {
 		unsigned long ra = __pa(con_write_page);
@@ -470,7 +470,7 @@ static void sunhv_console_write_paged(st
 	}
 
 	if (locked)
-		spin_unlock_irqrestore(&port->lock, flags);
+		uart_port_unlock_irqrestore(port, flags);
 }
 
 static inline void sunhv_console_putchar(struct uart_port *port, char c)
@@ -492,9 +492,9 @@ static void sunhv_console_write_bychar(s
 	int i, locked = 1;
 
 	if (port->sysrq || oops_in_progress)
-		locked = spin_trylock_irqsave(&port->lock, flags);
+		locked = uart_port_trylock_irqsave(port, &flags);
 	else
-		spin_lock_irqsave(&port->lock, flags);
+		uart_port_lock_irqsave(port, &flags);
 
 	for (i = 0; i < n; i++) {
 		if (*s == '\n')
@@ -503,7 +503,7 @@ static void sunhv_console_write_bychar(s
 	}
 
 	if (locked)
-		spin_unlock_irqrestore(&port->lock, flags);
+		uart_port_unlock_irqrestore(port, flags);
 }
 
 static struct console sunhv_console = {
