[All] (testing) Bumpe kernel to 6.6.14

buildroot-external/patches/linux/0077-serial-rda-Use-port-lock-wrappers.patch

@@ -0,0 +1,182 @@
+From 11c6ea3822ae8cdc779394e80156ca190afb39b7 Mon Sep 17 00:00:00 2001
+From: Thomas Gleixner <tglx@linutronix.de>
+Date: Thu, 14 Sep 2023 20:44:07 +0206
+Subject: [PATCH 077/195] serial: rda: 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/20230914183831.587273-51-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/rda-uart.c | 34 +++++++++++++++++-----------------
+ 1 file changed, 17 insertions(+), 17 deletions(-)
+
+diff --git a/drivers/tty/serial/rda-uart.c b/drivers/tty/serial/rda-uart.c
+index be5c842b5ba9..d824c8318f33 100644
+--- a/drivers/tty/serial/rda-uart.c
++++ b/drivers/tty/serial/rda-uart.c
+@@ -139,12 +139,12 @@ static unsigned int rda_uart_tx_empty(struct uart_port *port)
+ 	unsigned int ret;
+ 	u32 val;
+ 
+-	spin_lock_irqsave(&port->lock, flags);
++	uart_port_lock_irqsave(port, &flags);
+ 
+ 	val = rda_uart_read(port, RDA_UART_STATUS);
+ 	ret = (val & RDA_UART_TX_FIFO_MASK) ? TIOCSER_TEMT : 0;
+ 
+-	spin_unlock_irqrestore(&port->lock, flags);
++	uart_port_unlock_irqrestore(port, flags);
+ 
+ 	return ret;
+ }
+@@ -246,7 +246,7 @@ static void rda_uart_set_termios(struct uart_port *port,
+ 	unsigned int baud;
+ 	u32 irq_mask;
+ 
+-	spin_lock_irqsave(&port->lock, flags);
++	uart_port_lock_irqsave(port, &flags);
+ 
+ 	baud = uart_get_baud_rate(port, termios, old, 9600, port->uartclk / 4);
+ 	rda_uart_change_baudrate(rda_port, baud);
+@@ -325,7 +325,7 @@ static void rda_uart_set_termios(struct uart_port *port,
+ 	/* update the per-port timeout */
+ 	uart_update_timeout(port, termios->c_cflag, baud);
+ 
+-	spin_unlock_irqrestore(&port->lock, flags);
++	uart_port_unlock_irqrestore(port, flags);
+ }
+ 
+ static void rda_uart_send_chars(struct uart_port *port)
+@@ -408,7 +408,7 @@ static irqreturn_t rda_interrupt(int irq, void *dev_id)
+ 	unsigned long flags;
+ 	u32 val, irq_mask;
+ 
+-	spin_lock_irqsave(&port->lock, flags);
++	uart_port_lock_irqsave(port, &flags);
+ 
+ 	/* Clear IRQ cause */
+ 	val = rda_uart_read(port, RDA_UART_IRQ_CAUSE);
+@@ -425,7 +425,7 @@ static irqreturn_t rda_interrupt(int irq, void *dev_id)
+ 		rda_uart_send_chars(port);
+ 	}
+ 
+-	spin_unlock_irqrestore(&port->lock, flags);
++	uart_port_unlock_irqrestore(port, flags);
+ 
+ 	return IRQ_HANDLED;
+ }
+@@ -436,16 +436,16 @@ static int rda_uart_startup(struct uart_port *port)
+ 	int ret;
+ 	u32 val;
+ 
+-	spin_lock_irqsave(&port->lock, flags);
++	uart_port_lock_irqsave(port, &flags);
+ 	rda_uart_write(port, 0, RDA_UART_IRQ_MASK);
+-	spin_unlock_irqrestore(&port->lock, flags);
++	uart_port_unlock_irqrestore(port, flags);
+ 
+ 	ret = request_irq(port->irq, rda_interrupt, IRQF_NO_SUSPEND,
+ 			  "rda-uart", port);
+ 	if (ret)
+ 		return ret;
+ 
+-	spin_lock_irqsave(&port->lock, flags);
++	uart_port_lock_irqsave(port, &flags);
+ 
+ 	val = rda_uart_read(port, RDA_UART_CTRL);
+ 	val |= RDA_UART_ENABLE;
+@@ -456,7 +456,7 @@ static int rda_uart_startup(struct uart_port *port)
+ 	val |= (RDA_UART_RX_DATA_AVAILABLE | RDA_UART_RX_TIMEOUT);
+ 	rda_uart_write(port, val, RDA_UART_IRQ_MASK);
+ 
+-	spin_unlock_irqrestore(&port->lock, flags);
++	uart_port_unlock_irqrestore(port, flags);
+ 
+ 	return 0;
+ }
+@@ -466,7 +466,7 @@ static void rda_uart_shutdown(struct uart_port *port)
+ 	unsigned long flags;
+ 	u32 val;
+ 
+-	spin_lock_irqsave(&port->lock, flags);
++	uart_port_lock_irqsave(port, &flags);
+ 
+ 	rda_uart_stop_tx(port);
+ 	rda_uart_stop_rx(port);
+@@ -475,7 +475,7 @@ static void rda_uart_shutdown(struct uart_port *port)
+ 	val &= ~RDA_UART_ENABLE;
+ 	rda_uart_write(port, val, RDA_UART_CTRL);
+ 
+-	spin_unlock_irqrestore(&port->lock, flags);
++	uart_port_unlock_irqrestore(port, flags);
+ }
+ 
+ static const char *rda_uart_type(struct uart_port *port)
+@@ -515,7 +515,7 @@ static void rda_uart_config_port(struct uart_port *port, int flags)
+ 		rda_uart_request_port(port);
+ 	}
+ 
+-	spin_lock_irqsave(&port->lock, irq_flags);
++	uart_port_lock_irqsave(port, &irq_flags);
+ 
+ 	/* Clear mask, so no surprise interrupts. */
+ 	rda_uart_write(port, 0, RDA_UART_IRQ_MASK);
+@@ -523,7 +523,7 @@ static void rda_uart_config_port(struct uart_port *port, int flags)
+ 	/* Clear status register */
+ 	rda_uart_write(port, 0, RDA_UART_STATUS);
+ 
+-	spin_unlock_irqrestore(&port->lock, irq_flags);
++	uart_port_unlock_irqrestore(port, irq_flags);
+ }
+ 
+ static void rda_uart_release_port(struct uart_port *port)
+@@ -597,9 +597,9 @@ static void rda_uart_port_write(struct uart_port *port, const char *s,
+ 	if (port->sysrq) {
+ 		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;
+ 	}
+ 
+@@ -615,7 +615,7 @@ static void rda_uart_port_write(struct uart_port *port, const char *s,
+ 	rda_uart_write(port, old_irq_mask, RDA_UART_IRQ_MASK);
+ 
+ 	if (locked)
+-		spin_unlock(&port->lock);
++		uart_port_unlock(port);
+ 
+ 	local_irq_restore(flags);
+ }
+-- 
+2.43.0
+