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Date: Fri, 15 Jun 2018 18:39:19 +0900
From: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To: Petr Mladek <pmladek@...e.com>,
Steven Rostedt <rostedt@...dmis.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jslaby@...e.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Dmitry Vyukov <dvyukov@...gle.com>,
linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: [RFC][PATCH 6/6] tty: 8250: switch to uart_port locking helpers
Do not directly lock/unlock uart_port->lock, but use uart_port_lock
helper macros.
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
---
drivers/tty/serial/8250/8250_core.c | 8 ++--
drivers/tty/serial/8250/8250_dma.c | 4 +-
drivers/tty/serial/8250/8250_port.c | 74 ++++++++++++++---------------
3 files changed, 43 insertions(+), 43 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 9342fc2ee7df..ce7aa601c809 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -272,7 +272,7 @@ static void serial8250_backup_timeout(struct timer_list *t)
unsigned int iir, ier = 0, lsr;
unsigned long flags;
- spin_lock_irqsave(&up->port.lock, flags);
+ uart_port_lock_irqsave(&up->port.lock, flags);
/*
* Must disable interrupts or else we risk racing with the interrupt
@@ -306,7 +306,7 @@ static void serial8250_backup_timeout(struct timer_list *t)
if (up->port.irq)
serial_out(up, UART_IER, ier);
- spin_unlock_irqrestore(&up->port.lock, flags);
+ uart_port_unlock_irqrestore(&up->port.lock, flags);
/* Standard timer interval plus 0.2s to keep the port running */
mod_timer(&up->timer,
@@ -1078,9 +1078,9 @@ void serial8250_unregister_port(int line)
if (uart->em485) {
unsigned long flags;
- spin_lock_irqsave(&uart->port.lock, flags);
+ uart_port_lock_irqsave(&uart->port.lock, flags);
serial8250_em485_destroy(uart);
- spin_unlock_irqrestore(&uart->port.lock, flags);
+ uart_port_unlock_irqrestore(&uart->port.lock, flags);
}
uart_remove_one_port(&serial8250_reg, &uart->port);
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index bfa1a857f3ff..ec601779c32f 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -22,7 +22,7 @@ static void __dma_tx_complete(void *param)
dma_sync_single_for_cpu(dma->txchan->device->dev, dma->tx_addr,
UART_XMIT_SIZE, DMA_TO_DEVICE);
- spin_lock_irqsave(&p->port.lock, flags);
+ uart_port_lock_irqsave(&p->port.lock, flags);
dma->tx_running = 0;
@@ -39,7 +39,7 @@ static void __dma_tx_complete(void *param)
serial_port_out(&p->port, UART_IER, p->ier);
}
- spin_unlock_irqrestore(&p->port.lock, flags);
+ uart_port_unlock_irqrestore(&p->port.lock, flags);
}
static void __dma_rx_complete(void *param)
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index cf541aab2bd0..a1ee17870ebc 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -772,9 +772,9 @@ static void enable_rsa(struct uart_8250_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.lock);
__enable_rsa(up);
- spin_unlock_irq(&up->port.lock);
+ uart_port_unlock_irq(&up->port.lock);
}
if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
serial_out(up, UART_RSA_FRR, 0);
@@ -794,7 +794,7 @@ static void disable_rsa(struct uart_8250_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.lock);
mode = serial_in(up, UART_RSA_MSR);
result = !(mode & UART_RSA_MSR_FIFO);
@@ -807,7 +807,7 @@ static void disable_rsa(struct uart_8250_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.lock);
}
}
#endif /* CONFIG_SERIAL_8250_RSA */
@@ -1218,7 +1218,7 @@ static void autoconfig(struct uart_8250_port *up)
* We really do need global IRQs disabled here - we're going to
* be frobbing the chips IRQ enable register to see if it exists.
*/
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
up->capabilities = 0;
up->bugs = 0;
@@ -1257,7 +1257,7 @@ static void autoconfig(struct uart_8250_port *up)
/*
* We failed; there's nothing here
*/
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
DEBUG_AUTOCONF("IER test failed (%02x, %02x) ",
scratch2, scratch3);
goto out;
@@ -1281,7 +1281,7 @@ static void autoconfig(struct uart_8250_port *up)
status1 = serial_in(up, UART_MSR) & 0xF0;
serial8250_out_MCR(up, save_mcr);
if (status1 != 0x90) {
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
DEBUG_AUTOCONF("LOOP test failed (%02x) ",
status1);
goto out;
@@ -1354,7 +1354,7 @@ static void autoconfig(struct uart_8250_port *up)
serial_out(up, UART_IER, 0);
out_lock:
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
/*
* Check if the device is a Fintek F81216A
@@ -1466,12 +1466,12 @@ static enum hrtimer_restart serial8250_em485_handle_stop_tx(struct hrtimer *t)
p = em485->port;
serial8250_rpm_get(p);
- spin_lock_irqsave(&p->port.lock, flags);
+ uart_port_lock_irqsave(&p->port.lock, flags);
if (em485->active_timer == &em485->stop_tx_timer) {
__do_stop_tx_rs485(p);
em485->active_timer = NULL;
}
- spin_unlock_irqrestore(&p->port.lock, flags);
+ uart_port_unlock_irqrestore(&p->port.lock, flags);
serial8250_rpm_put(p);
return HRTIMER_NORESTART;
}
@@ -1620,12 +1620,12 @@ static enum hrtimer_restart serial8250_em485_handle_start_tx(struct hrtimer *t)
em485 = container_of(t, struct uart_8250_em485, start_tx_timer);
p = em485->port;
- spin_lock_irqsave(&p->port.lock, flags);
+ uart_port_lock_irqsave(&p->port.lock, flags);
if (em485->active_timer == &em485->start_tx_timer) {
__start_tx(&p->port);
em485->active_timer = NULL;
}
- spin_unlock_irqrestore(&p->port.lock, flags);
+ uart_port_unlock_irqrestore(&p->port.lock, flags);
return HRTIMER_NORESTART;
}
@@ -1867,7 +1867,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
if (iir & UART_IIR_NO_INT)
return 0;
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
status = serial_port_in(port, UART_LSR);
@@ -1880,7 +1880,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
if ((!up->dma || up->dma->tx_err) && (status & UART_LSR_THRE))
serial8250_tx_chars(up);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
return 1;
}
EXPORT_SYMBOL_GPL(serial8250_handle_irq);
@@ -1915,9 +1915,9 @@ static int serial8250_tx_threshold_handle_irq(struct uart_port *port)
if ((iir & UART_IIR_ID) == UART_IIR_THRI) {
struct uart_8250_port *up = up_to_u8250p(port);
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
serial8250_tx_chars(up);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
}
iir = serial_port_in(port, UART_IIR);
@@ -1932,10 +1932,10 @@ static unsigned int serial8250_tx_empty(struct uart_port *port)
serial8250_rpm_get(up);
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
lsr = serial_port_in(port, UART_LSR);
up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
serial8250_rpm_put(up);
@@ -2008,13 +2008,13 @@ static void serial8250_break_ctl(struct uart_port *port, int break_state)
unsigned long flags;
serial8250_rpm_get(up);
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
if (break_state == -1)
up->lcr |= UART_LCR_SBC;
else
up->lcr &= ~UART_LCR_SBC;
serial_port_out(port, UART_LCR, up->lcr);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
serial8250_rpm_put(up);
}
@@ -2266,7 +2266,7 @@ int serial8250_do_startup(struct uart_port *port)
* the interrupt is enabled. Delays are necessary to
* allow register changes to become visible.
*/
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
if (up->port.irqflags & IRQF_SHARED)
disable_irq_nosync(port->irq);
@@ -2282,7 +2282,7 @@ int serial8250_do_startup(struct uart_port *port)
if (port->irqflags & IRQF_SHARED)
enable_irq(port->irq);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
/*
* If the interrupt is not reasserted, or we otherwise
@@ -2304,7 +2304,7 @@ int serial8250_do_startup(struct uart_port *port)
*/
serial_port_out(port, UART_LCR, UART_LCR_WLEN8);
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
if (up->port.flags & UPF_FOURPORT) {
if (!up->port.irq)
up->port.mctrl |= TIOCM_OUT1;
@@ -2351,7 +2351,7 @@ int serial8250_do_startup(struct uart_port *port)
}
dont_test_tx_en:
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
/*
* Clear the interrupt registers again for luck, and clear the
@@ -2418,17 +2418,17 @@ void serial8250_do_shutdown(struct uart_port *port)
/*
* Disable interrupts from this port
*/
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
up->ier = 0;
serial_port_out(port, UART_IER, 0);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
synchronize_irq(port->irq);
if (up->dma)
serial8250_release_dma(up);
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
if (port->flags & UPF_FOURPORT) {
/* reset interrupts on the AST Fourport board */
inb((port->iobase & 0xfe0) | 0x1f);
@@ -2437,7 +2437,7 @@ void serial8250_do_shutdown(struct uart_port *port)
port->mctrl &= ~TIOCM_OUT2;
serial8250_set_mctrl(port, port->mctrl);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
/*
* Disable break condition and FIFOs
@@ -2643,7 +2643,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
* interrupts disabled.
*/
serial8250_rpm_get(up);
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
up->lcr = cval; /* Save computed LCR */
@@ -2747,7 +2747,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
serial_port_out(port, UART_FCR, up->fcr); /* set fcr */
}
serial8250_set_mctrl(port, port->mctrl);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
serial8250_rpm_put(up);
/* Don't rewrite B0 */
@@ -2770,15 +2770,15 @@ void serial8250_do_set_ldisc(struct uart_port *port, struct ktermios *termios)
{
if (termios->c_line == N_PPS) {
port->flags |= UPF_HARDPPS_CD;
- spin_lock_irq(&port->lock);
+ uart_port_lock_irq(&port->lock);
serial8250_enable_ms(port);
- spin_unlock_irq(&port->lock);
+ uart_port_unlock_irq(&port->lock);
} else {
port->flags &= ~UPF_HARDPPS_CD;
if (!UART_ENABLE_MS(port, termios->c_cflag)) {
- spin_lock_irq(&port->lock);
+ uart_port_lock_irq(&port->lock);
serial8250_disable_ms(port);
- spin_unlock_irq(&port->lock);
+ uart_port_unlock_irq(&port->lock);
}
}
}
@@ -3225,9 +3225,9 @@ void serial8250_console_write(struct uart_8250_port *up, const char *s,
if (port->sysrq)
locked = 0;
else if (oops_in_progress)
- locked = spin_trylock_irqsave(&port->lock, flags);
+ locked = uart_port_trylock_irqsave(&port->lock, flags);
else
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(&port->lock, flags);
/*
* First save the IER then disable the interrupts
@@ -3265,7 +3265,7 @@ void serial8250_console_write(struct uart_8250_port *up, const char *s,
serial8250_modem_status(up);
if (locked)
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(&port->lock, flags);
serial8250_rpm_put(up);
}
--
2.17.1
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