tty: Replace ASYNC_NORMAL_ACTIVE bit and update atomically
Replace ASYNC_NORMAL_ACTIVE bit in the tty_port::flags field with
TTY_PORT_ACTIVE bit in the tty_port::iflags field. Introduce helpers
tty_port_set_active() and tty_port_active() to abstract atomic bit ops.
Extract state changes from port lock sections, as this usage is
broken and confused; the state transitions are protected by the
tty lock (which mutually excludes parallel open/close/hangup),
and no user tests the active state while holding the port lock.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 92717b0..80d6165 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -1493,7 +1493,7 @@
rs_flush_buffer(tty);
shutdown(tty, info);
info->tport.count = 0;
- info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(&info->tport, 0);
info->tport.tty = NULL;
wake_up_interruptible(&info->tport.open_wait);
}
diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index 0b802cd..eb8311b 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -1042,9 +1042,10 @@
}
}
spin_lock_irq(&port->lock);
- info->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_NORMAL_ACTIVE);
+ port->flags &= ~ASYNC_INITIALIZED;
tty->closing = 0;
spin_unlock_irq(&port->lock);
+ tty_port_set_active(port, 0);
mutex_unlock(&port->mutex);
tty_port_tty_set(port, NULL);
@@ -1624,7 +1625,7 @@
/* Write remaining data into the port's xmit_buf */
while (1) {
/* Hung up ? */
- if (!test_bit(ASYNCB_NORMAL_ACTIVE, &info->port.flags))
+ if (!tty_port_active(&info->port))
goto end;
c = min(count, XMIT_BUF_SIZE - info->xmit_cnt - 1);
c = min(c, XMIT_BUF_SIZE - info->xmit_head);
diff --git a/drivers/tty/serial/crisv10.c b/drivers/tty/serial/crisv10.c
index 5469903..92c8c62 100644
--- a/drivers/tty/serial/crisv10.c
+++ b/drivers/tty/serial/crisv10.c
@@ -3648,8 +3648,8 @@
schedule_timeout_interruptible(info->port.close_delay);
wake_up_interruptible(&info->port.open_wait);
}
- info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
local_irq_restore(flags);
+ tty_port_set_active(&info->port, 0);
/* port closed */
@@ -3732,7 +3732,7 @@
shutdown(info);
info->event = 0;
info->port.count = 0;
- info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(&info->port, 0);
info->port.tty = NULL;
wake_up_interruptible(&info->port.open_wait);
}
@@ -3756,7 +3756,7 @@
* then make the check up front and then exit.
*/
if ((filp->f_flags & O_NONBLOCK) || tty_io_error(tty)) {
- info->port.flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(&info->port, 1);
return 0;
}
@@ -3825,7 +3825,7 @@
#endif
if (retval)
return retval;
- info->port.flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(&info->port, 1);
return 0;
}
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 64a5c00..2471380 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1418,12 +1418,12 @@
uart_change_pm(state, UART_PM_STATE_OFF);
spin_lock_irq(&port->lock);
}
+ spin_unlock_irq(&port->lock);
+ tty_port_set_active(port, 0);
/*
* Wake up anyone trying to open this port.
*/
- clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
- spin_unlock_irq(&port->lock);
wake_up_interruptible(&port->open_wait);
mutex_unlock(&port->mutex);
@@ -1501,13 +1501,13 @@
pr_debug("uart_hangup(%d)\n", tty->index);
mutex_lock(&port->mutex);
- if (port->flags & ASYNC_NORMAL_ACTIVE) {
+ if (tty_port_active(port)) {
uart_flush_buffer(tty);
uart_shutdown(tty, state);
spin_lock_irqsave(&port->lock, flags);
port->count = 0;
- clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
spin_unlock_irqrestore(&port->lock, flags);
+ tty_port_set_active(port, 0);
tty_port_tty_set(port, NULL);
if (!uart_console(state->uart_port))
uart_change_pm(state, UART_PM_STATE_OFF);
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 0e42901..b55f846 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -3201,7 +3201,7 @@
shutdown(info);
info->port.count = 0;
- info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(&info->port, 0);
info->port.tty = NULL;
wake_up_interruptible(&info->port.open_wait);
@@ -3269,7 +3269,7 @@
if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
/* nonblock mode is set or port is not enabled */
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return 0;
}
@@ -3338,7 +3338,7 @@
__FILE__,__LINE__, tty->driver->name, port->count );
if (!retval)
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return retval;
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index 5da69d3..c76f546 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -756,9 +756,9 @@
spin_lock_irqsave(&info->port.lock, flags);
info->port.count = 0;
- info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
info->port.tty = NULL;
spin_unlock_irqrestore(&info->port.lock, flags);
+ tty_port_set_active(&info->port, 0);
mutex_unlock(&info->port.mutex);
wake_up_interruptible(&info->port.open_wait);
@@ -3268,7 +3268,7 @@
if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
/* nonblock mode is set or port is not enabled */
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return 0;
}
@@ -3325,7 +3325,7 @@
port->blocked_open--;
if (!retval)
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
return retval;
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index 7a21491..95eddc4 100644
--- a/drivers/tty/synclinkmp.c
+++ b/drivers/tty/synclinkmp.c
@@ -849,9 +849,9 @@
spin_lock_irqsave(&info->port.lock, flags);
info->port.count = 0;
- info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
info->port.tty = NULL;
spin_unlock_irqrestore(&info->port.lock, flags);
+ tty_port_set_active(&info->port, 1);
mutex_unlock(&info->port.mutex);
wake_up_interruptible(&info->port.open_wait);
@@ -3285,7 +3285,7 @@
if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
/* nonblock mode is set or port is not enabled */
/* just verify that callout device is not active */
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return 0;
}
@@ -3352,7 +3352,7 @@
__FILE__,__LINE__, tty->driver->name, port->count );
if (!retval)
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return retval;
}
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 9127c54..130c8cf 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -236,12 +236,12 @@
spin_lock_irqsave(&port->lock, flags);
port->count = 0;
- port->flags &= ~ASYNC_NORMAL_ACTIVE;
tty = port->tty;
if (tty)
set_bit(TTY_IO_ERROR, &tty->flags);
port->tty = NULL;
spin_unlock_irqrestore(&port->lock, flags);
+ tty_port_set_active(port, 0);
tty_port_shutdown(port, tty);
tty_kref_put(tty);
wake_up_interruptible(&port->open_wait);
@@ -365,14 +365,14 @@
/* if non-blocking mode is set we can pass directly to open unless
the port has just hung up or is in another error state */
if (tty_io_error(tty)) {
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return 0;
}
if (filp->f_flags & O_NONBLOCK) {
/* Indicate we are open */
if (C_BAUD(tty))
tty_port_raise_dtr_rts(port);
- port->flags |= ASYNC_NORMAL_ACTIVE;
+ tty_port_set_active(port, 1);
return 0;
}
@@ -430,9 +430,9 @@
if (!tty_hung_up_p(filp))
port->count++;
port->blocked_open--;
- if (retval == 0)
- port->flags |= ASYNC_NORMAL_ACTIVE;
spin_unlock_irqrestore(&port->lock, flags);
+ if (retval == 0)
+ tty_port_set_active(port, 1);
return retval;
}
EXPORT_SYMBOL(tty_port_block_til_ready);
@@ -514,8 +514,8 @@
spin_lock_irqsave(&port->lock, flags);
wake_up_interruptible(&port->open_wait);
}
- port->flags &= ~ASYNC_NORMAL_ACTIVE;
spin_unlock_irqrestore(&port->lock, flags);
+ tty_port_set_active(port, 0);
}
EXPORT_SYMBOL(tty_port_close_end);