serial: core: Privatize modem status enable flags
The serial core uses the tty port flags, ASYNC_CTS_FLOW and
ASYNC_CD_CHECK, to track whether CTS and DCD changes should be
ignored or handled. However, the tty port flags are not safe for
atomic bit operations and no lock provides serialized updates.
Introduce the struct uart_port status field to track CTS and DCD
enable states, and serialize access with uart port lock. Substitute
uart_cts_enabled() helper for tty_port_cts_enabled().
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index b5c3292..10c2933 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -408,7 +408,7 @@
ctrl &= ~(AUART_CTRL2_RTSEN | AUART_CTRL2_RTS);
if (mctrl & TIOCM_RTS) {
- if (tty_port_cts_enabled(&u->state->port))
+ if (uart_cts_enabled(u))
ctrl |= AUART_CTRL2_RTSEN;
else
ctrl |= AUART_CTRL2_RTS;
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index f764de3..dd21ed9 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -59,6 +59,11 @@
static void uart_port_shutdown(struct tty_port *port);
+static int uart_dcd_enabled(struct uart_port *uport)
+{
+ return uport->status & UPSTAT_DCD_ENABLE;
+}
+
/*
* This routine is used by the interrupt handler to schedule processing in
* the software interrupt portion of the driver.
@@ -130,7 +135,6 @@
int init_hw)
{
struct uart_port *uport = state->uart_port;
- struct tty_port *port = &state->port;
unsigned long page;
int retval = 0;
@@ -176,12 +180,12 @@
uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
}
- if (tty_port_cts_enabled(port)) {
- spin_lock_irq(&uport->lock);
+ spin_lock_irq(&uport->lock);
+ if (uart_cts_enabled(uport)) {
if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS))
tty->hw_stopped = 1;
- spin_unlock_irq(&uport->lock);
}
+ spin_unlock_irq(&uport->lock);
}
/*
@@ -435,7 +439,6 @@
static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
struct ktermios *old_termios)
{
- struct tty_port *port = &state->port;
struct uart_port *uport = state->uart_port;
struct ktermios *termios;
@@ -450,17 +453,19 @@
uport->ops->set_termios(uport, termios, old_termios);
/*
- * Set flags based on termios cflag
+ * Set modem status enables based on termios cflag
*/
+ spin_lock_irq(&uport->lock);
if (termios->c_cflag & CRTSCTS)
- set_bit(ASYNCB_CTS_FLOW, &port->flags);
+ uport->status |= UPSTAT_CTS_ENABLE;
else
- clear_bit(ASYNCB_CTS_FLOW, &port->flags);
+ uport->status &= ~UPSTAT_CTS_ENABLE;
if (termios->c_cflag & CLOCAL)
- clear_bit(ASYNCB_CHECK_CD, &port->flags);
+ uport->status &= ~UPSTAT_DCD_ENABLE;
else
- set_bit(ASYNCB_CHECK_CD, &port->flags);
+ uport->status |= UPSTAT_DCD_ENABLE;
+ spin_unlock_irq(&uport->lock);
}
static inline int __uart_put_char(struct uart_port *port,
@@ -2765,7 +2770,7 @@
uport->icount.dcd++;
- if (port->flags & ASYNC_CHECK_CD) {
+ if (uart_dcd_enabled(uport)) {
if (status)
wake_up_interruptible(&port->open_wait);
else if (tty)
@@ -2790,7 +2795,7 @@
uport->icount.cts++;
- if (tty_port_cts_enabled(port)) {
+ if (uart_cts_enabled(uport)) {
if (tty->hw_stopped) {
if (status) {
tty->hw_stopped = 0;