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Date: Sat, 9 Apr 2016 17:53:24 -0700
From: Peter Hurley <peter@...leysoftware.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
linux-serial@...r.kernel.org,
Grant Edwards <grant.b.edwards@...il.com>,
Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH 5/8] tty: Replace ASYNC_SUSPENDED bit and update atomically
Replace ASYNC_SUSPENDED bit in the tty_port::flags field with
TTY_PORT_SUSPENDED bit in the tty_port::iflags field. Introduce helpers
tty_port_set_suspended() and tty_port_suspended() to abstract
atomic bit ops.
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
drivers/s390/char/con3215.c | 12 ++++++------
drivers/tty/serial/serial_core.c | 8 ++++----
include/linux/tty.h | 13 +++++++++++++
3 files changed, 23 insertions(+), 10 deletions(-)
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
index e7e078b..114fe28 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -289,7 +289,7 @@ static void raw3215_timeout(unsigned long __data)
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
raw->flags &= ~RAW3215_TIMER_RUNS;
- if (!(raw->port.flags & ASYNC_SUSPENDED)) {
+ if (!tty_port_suspended(&raw->port)) {
raw3215_mk_write_req(raw);
raw3215_start_io(raw);
if ((raw->queued_read || raw->queued_write) &&
@@ -312,7 +312,7 @@ static void raw3215_timeout(unsigned long __data)
static inline void raw3215_try_io(struct raw3215_info *raw)
{
if (!(raw->port.flags & ASYNC_INITIALIZED) ||
- (raw->port.flags & ASYNC_SUSPENDED))
+ tty_port_suspended(&raw->port))
return;
if (raw->queued_read != NULL)
raw3215_start_io(raw);
@@ -494,7 +494,7 @@ static void raw3215_make_room(struct raw3215_info *raw, unsigned int length)
/* While console is frozen for suspend we have no other
* choice but to drop message from the buffer to make
* room for even more messages. */
- if (raw->port.flags & ASYNC_SUSPENDED) {
+ if (tty_port_suspended(&raw->port)) {
raw3215_drop_line(raw);
continue;
}
@@ -773,7 +773,7 @@ static int raw3215_pm_stop(struct ccw_device *cdev)
raw = dev_get_drvdata(&cdev->dev);
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
- raw->port.flags |= ASYNC_SUSPENDED;
+ tty_port_set_suspended(&raw->port, 1);
spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags);
return 0;
}
@@ -786,7 +786,7 @@ static int raw3215_pm_start(struct ccw_device *cdev)
/* Allow I/O again and flush output buffer. */
raw = dev_get_drvdata(&cdev->dev);
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
- raw->port.flags &= ~ASYNC_SUSPENDED;
+ tty_port_set_suspended(&raw->port, 0);
raw->flags |= RAW3215_FLUSHING;
raw3215_try_io(raw);
raw->flags &= ~RAW3215_FLUSHING;
@@ -859,7 +859,7 @@ static void con3215_flush(void)
unsigned long flags;
raw = raw3215[0]; /* console 3215 is the first one */
- if (raw->port.flags & ASYNC_SUSPENDED)
+ if (tty_port_suspended(&raw->port))
/* The console is still frozen for suspend. */
if (ccw_device_force_console(raw->cdev))
/* Forcing didn't work, no panic message .. */
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 2471380..9336067 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -249,7 +249,7 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
* a DCD drop (hangup) at just the right time. Clear suspended bit so
* we don't try to resume a port that has been shutdown.
*/
- clear_bit(ASYNCB_SUSPENDED, &port->flags);
+ tty_port_set_suspended(port, 0);
/*
* Free the transmit buffer page.
@@ -2007,7 +2007,7 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
const struct uart_ops *ops = uport->ops;
int tries;
- set_bit(ASYNCB_SUSPENDED, &port->flags);
+ tty_port_set_suspended(port, 1);
clear_bit(ASYNCB_INITIALIZED, &port->flags);
spin_lock_irq(&uport->lock);
@@ -2088,7 +2088,7 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
console_start(uport->cons);
}
- if (port->flags & ASYNC_SUSPENDED) {
+ if (tty_port_suspended(port)) {
const struct uart_ops *ops = uport->ops;
int ret;
@@ -2118,7 +2118,7 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
}
}
- clear_bit(ASYNCB_SUSPENDED, &port->flags);
+ tty_port_set_suspended(port, 0);
}
mutex_unlock(&port->mutex);
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 4254dfb..7ac5add 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -597,6 +597,19 @@ static inline void tty_port_set_check_carrier(struct tty_port *port, bool val)
clear_bit(TTY_PORT_CHECK_CD, &port->iflags);
}
+static inline bool tty_port_suspended(struct tty_port *port)
+{
+ return test_bit(TTY_PORT_SUSPENDED, &port->iflags);
+}
+
+static inline void tty_port_set_suspended(struct tty_port *port, bool val)
+{
+ if (val)
+ set_bit(TTY_PORT_SUSPENDED, &port->iflags);
+ else
+ clear_bit(TTY_PORT_SUSPENDED, &port->iflags);
+}
+
extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
extern int tty_port_carrier_raised(struct tty_port *port);
--
2.8.1
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