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authorThomas Gleixner <tglx@linutronix.de>2023-09-14 20:38:25 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-09-18 11:18:15 +0200
commitf610d445ff1a0e812656f7f9cb8498d4d9b0cae2 (patch)
tree2cabaed08fa4a5be7fe860dfe0d2d4accb8366b1
parentserial: sunsab: Use port lock wrappers (diff)
downloadlinux-f610d445ff1a0e812656f7f9cb8498d4d9b0cae2.tar.xz
linux-f610d445ff1a0e812656f7f9cb8498d4d9b0cae2.zip
serial: sunsu: 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/20230914183831.587273-69-john.ogness@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/serial/sunsu.c46
1 files changed, 23 insertions, 23 deletions
diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c
index 58a4342ad0f9..1e051cc2591c 100644
--- a/drivers/tty/serial/sunsu.c
+++ b/drivers/tty/serial/sunsu.c
@@ -212,9 +212,9 @@ static void enable_rsa(struct uart_sunsu_port *up)
{
if (up->port.type == PORT_RSA) {
if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
- spin_lock_irq(&up->port.lock);
+ uart_port_lock_irq(&up->port);
__enable_rsa(up);
- spin_unlock_irq(&up->port.lock);
+ uart_port_unlock_irq(&up->port);
}
if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
serial_outp(up, UART_RSA_FRR, 0);
@@ -234,7 +234,7 @@ static void disable_rsa(struct uart_sunsu_port *up)
if (up->port.type == PORT_RSA &&
up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
- spin_lock_irq(&up->port.lock);
+ uart_port_lock_irq(&up->port);
mode = serial_inp(up, UART_RSA_MSR);
result = !(mode & UART_RSA_MSR_FIFO);
@@ -247,7 +247,7 @@ static void disable_rsa(struct uart_sunsu_port *up)
if (result)
up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
- spin_unlock_irq(&up->port.lock);
+ uart_port_unlock_irq(&up->port);
}
}
#endif /* CONFIG_SERIAL_8250_RSA */
@@ -311,10 +311,10 @@ static void sunsu_enable_ms(struct uart_port *port)
container_of(port, struct uart_sunsu_port, port);
unsigned long flags;
- spin_lock_irqsave(&up->port.lock, flags);
+ uart_port_lock_irqsave(&up->port, &flags);
up->ier |= UART_IER_MSI;
serial_out(up, UART_IER, up->ier);
- spin_unlock_irqrestore(&up->port.lock, flags);
+ uart_port_unlock_irqrestore(&up->port, flags);
}
static void
@@ -456,7 +456,7 @@ static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
unsigned long flags;
unsigned char status;
- spin_lock_irqsave(&up->port.lock, flags);
+ uart_port_lock_irqsave(&up->port, &flags);
do {
status = serial_inp(up, UART_LSR);
@@ -470,7 +470,7 @@ static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
} while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));
- spin_unlock_irqrestore(&up->port.lock, flags);
+ uart_port_unlock_irqrestore(&up->port, flags);
return IRQ_HANDLED;
}
@@ -545,9 +545,9 @@ static unsigned int sunsu_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;
}
@@ -599,13 +599,13 @@ static void sunsu_break_ctl(struct uart_port *port, int break_state)
container_of(port, struct uart_sunsu_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 sunsu_startup(struct uart_port *port)
@@ -683,12 +683,12 @@ static int sunsu_startup(struct uart_port *port)
*/
serial_outp(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;
sunsu_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
@@ -731,7 +731,7 @@ static void sunsu_shutdown(struct uart_port *port)
up->ier = 0;
serial_outp(up, UART_IER, 0);
- spin_lock_irqsave(&up->port.lock, flags);
+ uart_port_lock_irqsave(&up->port, &flags);
if (up->port.flags & UPF_FOURPORT) {
/* reset interrupts on the AST Fourport board */
inb((up->port.iobase & 0xfe0) | 0x1f);
@@ -740,7 +740,7 @@ static void sunsu_shutdown(struct uart_port *port)
up->port.mctrl &= ~TIOCM_OUT2;
sunsu_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
@@ -826,7 +826,7 @@ sunsu_change_speed(struct uart_port *port, unsigned int cflag,
* 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);
/*
* Update the per-port timeout.
@@ -891,7 +891,7 @@ sunsu_change_speed(struct uart_port *port, unsigned int cflag,
up->cflag = cflag;
- spin_unlock_irqrestore(&up->port.lock, flags);
+ uart_port_unlock_irqrestore(&up->port, flags);
}
static void
@@ -1038,7 +1038,7 @@ static void sunsu_autoconfig(struct uart_sunsu_port *up)
up->type_probed = PORT_UNKNOWN;
up->port.iotype = UPIO_MEM;
- spin_lock_irqsave(&up->port.lock, flags);
+ uart_port_lock_irqsave(&up->port, &flags);
if (!(up->port.flags & UPF_BUGGY_UART)) {
/*
@@ -1173,7 +1173,7 @@ static void sunsu_autoconfig(struct uart_sunsu_port *up)
serial_outp(up, UART_IER, 0);
out:
- spin_unlock_irqrestore(&up->port.lock, flags);
+ uart_port_unlock_irqrestore(&up->port, flags);
}
static struct uart_driver sunsu_reg = {
@@ -1298,9 +1298,9 @@ static void sunsu_console_write(struct console *co, const char *s,
int locked = 1;
if (up->port.sysrq || 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 UER then disable the interrupts
@@ -1318,7 +1318,7 @@ static void sunsu_console_write(struct console *co, const char *s,
serial_out(up, UART_IER, ier);
if (locked)
- spin_unlock_irqrestore(&up->port.lock, flags);
+ uart_port_unlock_irqrestore(&up->port, flags);
}
/*