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

buildroot-external/patches/linux/0084-serial-mctrl_gpio-Use-port-lock-wrappers.patch

@@ -0,0 +1,63 @@
+From e95dcd064a7ecf11a88145697128827b6758169e Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Thu, 14 Sep 2023 20:44:15 +0206
+Subject: [PATCH 084/196] serial: mctrl_gpio: 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>
+Signed-off-by: John Ogness <john.ogness@linutronix.de>
+Link: https://lore.kernel.org/r/20230914183831.587273-59-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/serial_mctrl_gpio.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
+index 7d5aaa8d422b..e51ca593ab86 100644
+--- a/drivers/tty/serial/serial_mctrl_gpio.c
++++ b/drivers/tty/serial/serial_mctrl_gpio.c
+@@ -184,7 +184,7 @@ static irqreturn_t mctrl_gpio_irq_handle(int irq, void *context)
+ 
+ 	mctrl_gpio_get(gpios, &mctrl);
+ 
+-	spin_lock_irqsave(&port->lock, flags);
++	uart_port_lock_irqsave(port, &flags);
+ 
+ 	mctrl_diff = mctrl ^ gpios->mctrl_prev;
+ 	gpios->mctrl_prev = mctrl;
+@@ -205,7 +205,7 @@ static irqreturn_t mctrl_gpio_irq_handle(int irq, void *context)
+ 		wake_up_interruptible(&port->state->port.delta_msr_wait);
+ 	}
+ 
+-	spin_unlock_irqrestore(&port->lock, flags);
++	uart_port_unlock_irqrestore(port, flags);
+ 
+ 	return IRQ_HANDLED;
+ }
+-- 
+2.43.2
+