2024-03-01 08:54:30 +01:00
|
|
|
From 2c8fbdf011421d0e63a7c1d116fd4ad727fb9b5e Mon Sep 17 00:00:00 2001
|
2024-02-05 17:41:40 +01:00
|
|
|
From: Thomas Gleixner <tglx@linutronix.de>
|
|
|
|
Date: Thu, 14 Sep 2023 20:44:05 +0206
|
2024-03-01 08:54:30 +01:00
|
|
|
Subject: [PATCH 074/196] serial: pxa: Use port lock wrappers
|
2024-02-05 17:41:40 +01:00
|
|
|
|
|
|
|
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/20230914183831.587273-49-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/pxa.c | 30 +++++++++++++++---------------
|
|
|
|
1 file changed, 15 insertions(+), 15 deletions(-)
|
|
|
|
|
|
|
|
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
|
|
|
|
index 73c60f5ea027..46e70e155aab 100644
|
|
|
|
--- a/drivers/tty/serial/pxa.c
|
|
|
|
+++ b/drivers/tty/serial/pxa.c
|
|
|
|
@@ -225,14 +225,14 @@ static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
|
|
|
|
iir = serial_in(up, UART_IIR);
|
|
|
|
if (iir & UART_IIR_NO_INT)
|
|
|
|
return IRQ_NONE;
|
|
|
|
- spin_lock(&up->port.lock);
|
|
|
|
+ uart_port_lock(&up->port);
|
|
|
|
lsr = serial_in(up, UART_LSR);
|
|
|
|
if (lsr & UART_LSR_DR)
|
|
|
|
receive_chars(up, &lsr);
|
|
|
|
check_modem_status(up);
|
|
|
|
if (lsr & UART_LSR_THRE)
|
|
|
|
transmit_chars(up);
|
|
|
|
- spin_unlock(&up->port.lock);
|
|
|
|
+ uart_port_unlock(&up->port);
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
@@ -242,9 +242,9 @@ static unsigned int serial_pxa_tx_empty(struct uart_port *port)
|
|
|
|
unsigned long flags;
|
|
|
|
unsigned int ret;
|
|
|
|
|
|
|
|
- spin_lock_irqsave(&up->port.lock, flags);
|
|
|
|
+ uart_port_lock_irqsave(&up->port, &flags);
|
|
|
|
ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
|
|
|
|
- spin_unlock_irqrestore(&up->port.lock, flags);
|
|
|
|
+ uart_port_unlock_irqrestore(&up->port, flags);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
@@ -295,13 +295,13 @@ static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
|
|
|
|
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
- spin_lock_irqsave(&up->port.lock, flags);
|
|
|
|
+ uart_port_lock_irqsave(&up->port, &flags);
|
|
|
|
if (break_state == -1)
|
|
|
|
up->lcr |= UART_LCR_SBC;
|
|
|
|
else
|
|
|
|
up->lcr &= ~UART_LCR_SBC;
|
|
|
|
serial_out(up, UART_LCR, up->lcr);
|
|
|
|
- spin_unlock_irqrestore(&up->port.lock, flags);
|
|
|
|
+ uart_port_unlock_irqrestore(&up->port, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int serial_pxa_startup(struct uart_port *port)
|
|
|
|
@@ -346,10 +346,10 @@ static int serial_pxa_startup(struct uart_port *port)
|
|
|
|
*/
|
|
|
|
serial_out(up, UART_LCR, UART_LCR_WLEN8);
|
|
|
|
|
|
|
|
- spin_lock_irqsave(&up->port.lock, flags);
|
|
|
|
+ uart_port_lock_irqsave(&up->port, &flags);
|
|
|
|
up->port.mctrl |= TIOCM_OUT2;
|
|
|
|
serial_pxa_set_mctrl(&up->port, up->port.mctrl);
|
|
|
|
- spin_unlock_irqrestore(&up->port.lock, flags);
|
|
|
|
+ uart_port_unlock_irqrestore(&up->port, flags);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Finally, enable interrupts. Note: Modem status interrupts
|
|
|
|
@@ -383,10 +383,10 @@ static void serial_pxa_shutdown(struct uart_port *port)
|
|
|
|
up->ier = 0;
|
|
|
|
serial_out(up, UART_IER, 0);
|
|
|
|
|
|
|
|
- spin_lock_irqsave(&up->port.lock, flags);
|
|
|
|
+ uart_port_lock_irqsave(&up->port, &flags);
|
|
|
|
up->port.mctrl &= ~TIOCM_OUT2;
|
|
|
|
serial_pxa_set_mctrl(&up->port, up->port.mctrl);
|
|
|
|
- spin_unlock_irqrestore(&up->port.lock, flags);
|
|
|
|
+ uart_port_unlock_irqrestore(&up->port, flags);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Disable break condition and FIFOs
|
|
|
|
@@ -434,7 +434,7 @@ serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
|
|
|
|
* 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);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Ensure the port will be enabled.
|
|
|
|
@@ -504,7 +504,7 @@ serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
|
|
|
|
up->lcr = cval; /* Save LCR */
|
|
|
|
serial_pxa_set_mctrl(&up->port, up->port.mctrl);
|
|
|
|
serial_out(up, UART_FCR, fcr);
|
|
|
|
- spin_unlock_irqrestore(&up->port.lock, flags);
|
|
|
|
+ uart_port_unlock_irqrestore(&up->port, flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
@@ -608,9 +608,9 @@ serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
|
|
|
|
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
|
|
|
|
@@ -628,7 +628,7 @@ serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
|
|
|
|
serial_out(up, UART_IER, ier);
|
|
|
|
|
|
|
|
if (locked)
|
|
|
|
- spin_unlock(&up->port.lock);
|
|
|
|
+ uart_port_unlock(&up->port);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
clk_disable(up->clk);
|
|
|
|
|
|
|
|
--
|
2024-03-01 08:54:30 +01:00
|
|
|
2.43.2
|
2024-02-05 17:41:40 +01:00
|
|
|
|