[All] (testing) Bumpe kernel to 6.6.14

buildroot-external/patches/linux/0046-serial-ar933x-Use-port-lock-wrappers.patch

@@ -0,0 +1,149 @@
+From 44c925a7d696a264d3a2a82719ebf8edb6ed867d Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Thu, 14 Sep 2023 20:43:36 +0206
+Subject: [PATCH 046/195] serial: ar933x: 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/20230914183831.587273-20-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/ar933x_uart.c | 26 +++++++++++++-------------
+ 1 file changed, 13 insertions(+), 13 deletions(-)
+
+diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
+index 924c1a89347c..ffd234673177 100644
+--- a/drivers/tty/serial/ar933x_uart.c
++++ b/drivers/tty/serial/ar933x_uart.c
+@@ -133,9 +133,9 @@ static unsigned int ar933x_uart_tx_empty(struct uart_port *port)
+ 	unsigned long flags;
+ 	unsigned int rdata;
+ 
+-	spin_lock_irqsave(&up->port.lock, flags);
++	uart_port_lock_irqsave(&up->port, &flags);
+ 	rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
+-	spin_unlock_irqrestore(&up->port.lock, flags);
++	uart_port_unlock_irqrestore(&up->port, flags);
+ 
+ 	return (rdata & AR933X_UART_DATA_TX_CSR) ? 0 : TIOCSER_TEMT;
+ }
+@@ -220,14 +220,14 @@ static void ar933x_uart_break_ctl(struct uart_port *port, int break_state)
+ 		container_of(port, struct ar933x_uart_port, port);
+ 	unsigned long flags;
+ 
+-	spin_lock_irqsave(&up->port.lock, flags);
++	uart_port_lock_irqsave(&up->port, &flags);
+ 	if (break_state == -1)
+ 		ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
+ 				    AR933X_UART_CS_TX_BREAK);
+ 	else
+ 		ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG,
+ 				      AR933X_UART_CS_TX_BREAK);
+-	spin_unlock_irqrestore(&up->port.lock, flags);
++	uart_port_unlock_irqrestore(&up->port, flags);
+ }
+ 
+ /*
+@@ -318,7 +318,7 @@ static void ar933x_uart_set_termios(struct uart_port *port,
+ 	 * Ok, we're now changing the port state. Do it with
+ 	 * interrupts disabled.
+ 	 */
+-	spin_lock_irqsave(&up->port.lock, flags);
++	uart_port_lock_irqsave(&up->port, &flags);
+ 
+ 	/* disable the UART */
+ 	ar933x_uart_rmw_clear(up, AR933X_UART_CS_REG,
+@@ -352,7 +352,7 @@ static void ar933x_uart_set_termios(struct uart_port *port,
+ 			AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S,
+ 			AR933X_UART_CS_IF_MODE_DCE << AR933X_UART_CS_IF_MODE_S);
+ 
+-	spin_unlock_irqrestore(&up->port.lock, flags);
++	uart_port_unlock_irqrestore(&up->port, flags);
+ 
+ 	if (tty_termios_baud_rate(new))
+ 		tty_termios_encode_baud_rate(new, baud, baud);
+@@ -450,7 +450,7 @@ static irqreturn_t ar933x_uart_interrupt(int irq, void *dev_id)
+ 	if ((status & AR933X_UART_CS_HOST_INT) == 0)
+ 		return IRQ_NONE;
+ 
+-	spin_lock(&up->port.lock);
++	uart_port_lock(&up->port);
+ 
+ 	status = ar933x_uart_read(up, AR933X_UART_INT_REG);
+ 	status &= ar933x_uart_read(up, AR933X_UART_INT_EN_REG);
+@@ -468,7 +468,7 @@ static irqreturn_t ar933x_uart_interrupt(int irq, void *dev_id)
+ 		ar933x_uart_tx_chars(up);
+ 	}
+ 
+-	spin_unlock(&up->port.lock);
++	uart_port_unlock(&up->port);
+ 
+ 	return IRQ_HANDLED;
+ }
+@@ -485,7 +485,7 @@ static int ar933x_uart_startup(struct uart_port *port)
+ 	if (ret)
+ 		return ret;
+ 
+-	spin_lock_irqsave(&up->port.lock, flags);
++	uart_port_lock_irqsave(&up->port, &flags);
+ 
+ 	/* Enable HOST interrupts */
+ 	ar933x_uart_rmw_set(up, AR933X_UART_CS_REG,
+@@ -498,7 +498,7 @@ static int ar933x_uart_startup(struct uart_port *port)
+ 	/* Enable RX interrupts */
+ 	ar933x_uart_start_rx_interrupt(up);
+ 
+-	spin_unlock_irqrestore(&up->port.lock, flags);
++	uart_port_unlock_irqrestore(&up->port, flags);
+ 
+ 	return 0;
+ }
+@@ -632,9 +632,9 @@ static void ar933x_uart_console_write(struct console *co, const char *s,
+ 	if (up->port.sysrq)
+ 		locked = 0;
+ 	else if (oops_in_progress)
+-		locked = spin_trylock(&up->port.lock);
++		locked = uart_port_trylock(&up->port);
+ 	else
+-		spin_lock(&up->port.lock);
++		uart_port_lock(&up->port);
+ 
+ 	/*
+ 	 * First save the IER then disable the interrupts
+@@ -654,7 +654,7 @@ static void ar933x_uart_console_write(struct console *co, const char *s,
+ 	ar933x_uart_write(up, AR933X_UART_INT_REG, AR933X_UART_INT_ALLINTS);
+ 
+ 	if (locked)
+-		spin_unlock(&up->port.lock);
++		uart_port_unlock(&up->port);
+ 
+ 	local_irq_restore(flags);
+ }
+-- 
+2.43.0
+