[All] (testing) Bumpe kernel to 6.6.14

buildroot-external/patches/linux/0061-serial-ma35d1-Use-port-lock-wrappers.patch

@@ -0,0 +1,122 @@
+From 294b8734d1b7df5b8bd169179926820cf601ee49 Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Thu, 14 Sep 2023 20:43:51 +0206
+Subject: [PATCH 061/195] serial: ma35d1: 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/20230914183831.587273-35-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/ma35d1_serial.c | 22 +++++++++++-----------
+ 1 file changed, 11 insertions(+), 11 deletions(-)
+
+diff --git a/drivers/tty/serial/ma35d1_serial.c b/drivers/tty/serial/ma35d1_serial.c
+index 69da24565b99..73910c54d6be 100644
+--- a/drivers/tty/serial/ma35d1_serial.c
++++ b/drivers/tty/serial/ma35d1_serial.c
+@@ -269,16 +269,16 @@ static void receive_chars(struct uart_ma35d1_port *up)
+ 		if (uart_handle_sysrq_char(&up->port, ch))
+ 			continue;
+ 
+-		spin_lock(&up->port.lock);
++		uart_port_lock(&up->port);
+ 		uart_insert_char(&up->port, fsr, MA35_FSR_RX_OVER_IF, ch, flag);
+-		spin_unlock(&up->port.lock);
++		uart_port_unlock(&up->port);
+ 
+ 		fsr = serial_in(up, MA35_FSR_REG);
+ 	} while (!(fsr & MA35_FSR_RX_EMPTY) && (max_count-- > 0));
+ 
+-	spin_lock(&up->port.lock);
++	uart_port_lock(&up->port);
+ 	tty_flip_buffer_push(&up->port.state->port);
+-	spin_unlock(&up->port.lock);
++	uart_port_unlock(&up->port);
+ }
+ 
+ static irqreturn_t ma35d1serial_interrupt(int irq, void *dev_id)
+@@ -364,14 +364,14 @@ static void ma35d1serial_break_ctl(struct uart_port *port, int break_state)
+ 	unsigned long flags;
+ 	u32 lcr;
+ 
+-	spin_lock_irqsave(&up->port.lock, flags);
++	uart_port_lock_irqsave(&up->port, &flags);
+ 	lcr = serial_in(up, MA35_LCR_REG);
+ 	if (break_state != 0)
+ 		lcr |= MA35_LCR_BREAK;
+ 	else
+ 		lcr &= ~MA35_LCR_BREAK;
+ 	serial_out(up, MA35_LCR_REG, lcr);
+-	spin_unlock_irqrestore(&up->port.lock, flags);
++	uart_port_unlock_irqrestore(&up->port, flags);
+ }
+ 
+ static int ma35d1serial_startup(struct uart_port *port)
+@@ -441,7 +441,7 @@ static void ma35d1serial_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);
+ 
+ 	up->port.read_status_mask = MA35_FSR_RX_OVER_IF;
+ 	if (termios->c_iflag & INPCK)
+@@ -475,7 +475,7 @@ static void ma35d1serial_set_termios(struct uart_port *port,
+ 
+ 	serial_out(up, MA35_LCR_REG, lcr);
+ 
+-	spin_unlock_irqrestore(&up->port.lock, flags);
++	uart_port_unlock_irqrestore(&up->port, flags);
+ }
+ 
+ static const char *ma35d1serial_type(struct uart_port *port)
+@@ -568,9 +568,9 @@ static void ma35d1serial_console_write(struct console *co, const char *s, u32 co
+ 	if (up->port.sysrq)
+ 		locked = 0;
+ 	else if (oops_in_progress)
+-		locked = spin_trylock_irqsave(&up->port.lock, flags);
++		locked = uart_port_trylock_irqsave(&up->port, &flags);
+ 	else
+-		spin_lock_irqsave(&up->port.lock, flags);
++		uart_port_lock_irqsave(&up->port, &flags);
+ 
+ 	/*
+ 	 *  First save the IER then disable the interrupts
+@@ -584,7 +584,7 @@ static void ma35d1serial_console_write(struct console *co, const char *s, u32 co
+ 	serial_out(up, MA35_IER_REG, ier);
+ 
+ 	if (locked)
+-		spin_unlock_irqrestore(&up->port.lock, flags);
++		uart_port_unlock_irqrestore(&up->port, flags);
+ }
+ 
+ static int __init ma35d1serial_console_setup(struct console *co, char *options)
+-- 
+2.43.0
+