[All] {WIP} The big bump to buildroot 2024.02.x

buildroot-external/patches/linux/0048-serial-bcm63xx-uart-Use-port-lock-wrappers.patch

@@ -0,0 +1,133 @@
+From bc56987ad8ef8a8948ba64ffa8302ea324913079 Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Thu, 14 Sep 2023 20:43:39 +0206
+Subject: [PATCH 048/196] serial: bcm63xx-uart: Use port lock wrappers
+
+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>
+Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
+Signed-off-by: John Ogness <john.ogness@linutronix.de>
+Link: https://lore.kernel.org/r/20230914183831.587273-23-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/bcm63xx_uart.c | 22 +++++++++++-----------
+ 1 file changed, 11 insertions(+), 11 deletions(-)
+
+diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
+index 0dd8cceb837c..4a08fd5ee61b 100644
+--- a/drivers/tty/serial/bcm63xx_uart.c
++++ b/drivers/tty/serial/bcm63xx_uart.c
+@@ -201,7 +201,7 @@ static void bcm_uart_break_ctl(struct uart_port *port, int ctl)
+ 	unsigned long flags;
+ 	unsigned int val;
+ 
+-	spin_lock_irqsave(&port->lock, flags);
++	uart_port_lock_irqsave(port, &flags);
+ 
+ 	val = bcm_uart_readl(port, UART_CTL_REG);
+ 	if (ctl)
+@@ -210,7 +210,7 @@ static void bcm_uart_break_ctl(struct uart_port *port, int ctl)
+ 		val &= ~UART_CTL_XMITBRK_MASK;
+ 	bcm_uart_writel(port, val, UART_CTL_REG);
+ 
+-	spin_unlock_irqrestore(&port->lock, flags);
++	uart_port_unlock_irqrestore(port, flags);
+ }
+ 
+ /*
+@@ -332,7 +332,7 @@ static irqreturn_t bcm_uart_interrupt(int irq, void *dev_id)
+ 	unsigned int irqstat;
+ 
+ 	port = dev_id;
+-	spin_lock(&port->lock);
++	uart_port_lock(port);
+ 
+ 	irqstat = bcm_uart_readl(port, UART_IR_REG);
+ 	if (irqstat & UART_RX_INT_STAT)
+@@ -353,7 +353,7 @@ static irqreturn_t bcm_uart_interrupt(int irq, void *dev_id)
+ 					       estat & UART_EXTINP_DCD_MASK);
+ 	}
+ 
+-	spin_unlock(&port->lock);
++	uart_port_unlock(port);
+ 	return IRQ_HANDLED;
+ }
+ 
+@@ -451,9 +451,9 @@ static void bcm_uart_shutdown(struct uart_port *port)
+ {
+ 	unsigned long flags;
+ 
+-	spin_lock_irqsave(&port->lock, flags);
++	uart_port_lock_irqsave(port, &flags);
+ 	bcm_uart_writel(port, 0, UART_IR_REG);
+-	spin_unlock_irqrestore(&port->lock, flags);
++	uart_port_unlock_irqrestore(port, flags);
+ 
+ 	bcm_uart_disable(port);
+ 	bcm_uart_flush(port);
+@@ -470,7 +470,7 @@ static void bcm_uart_set_termios(struct uart_port *port, struct ktermios *new,
+ 	unsigned long flags;
+ 	int tries;
+ 
+-	spin_lock_irqsave(&port->lock, flags);
++	uart_port_lock_irqsave(port, &flags);
+ 
+ 	/* Drain the hot tub fully before we power it off for the winter. */
+ 	for (tries = 3; !bcm_uart_tx_empty(port) && tries; tries--)
+@@ -546,7 +546,7 @@ static void bcm_uart_set_termios(struct uart_port *port, struct ktermios *new,
+ 
+ 	uart_update_timeout(port, new->c_cflag, baud);
+ 	bcm_uart_enable(port);
+-	spin_unlock_irqrestore(&port->lock, flags);
++	uart_port_unlock_irqrestore(port, flags);
+ }
+ 
+ /*
+@@ -712,9 +712,9 @@ static void bcm_console_write(struct console *co, const char *s,
+ 		/* bcm_uart_interrupt() already took the lock */
+ 		locked = 0;
+ 	} else if (oops_in_progress) {
+-		locked = spin_trylock(&port->lock);
++		locked = uart_port_trylock(port);
+ 	} else {
+-		spin_lock(&port->lock);
++		uart_port_lock(port);
+ 		locked = 1;
+ 	}
+ 
+@@ -725,7 +725,7 @@ static void bcm_console_write(struct console *co, const char *s,
+ 	wait_for_xmitr(port);
+ 
+ 	if (locked)
+-		spin_unlock(&port->lock);
++		uart_port_unlock(port);
+ 	local_irq_restore(flags);
+ }
+ 
+-- 
+2.43.2
+