diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_port.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 66374704747e..5775cbff8f6e 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -1338,7 +1338,7 @@ static void autoconfig(struct uart_8250_port *up) up->tx_loadsz = uart_config[port->type].tx_loadsz; if (port->type == PORT_UNKNOWN) - goto out_lock; + goto out_unlock; /* * Reset the UART. @@ -1355,7 +1355,7 @@ static void autoconfig(struct uart_8250_port *up) else serial_out(up, UART_IER, 0); -out_lock: +out_unlock: spin_unlock_irqrestore(&port->lock, flags); /* @@ -2696,21 +2696,32 @@ static unsigned int serial8250_get_baud_rate(struct uart_port *port, void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk) { struct uart_8250_port *up = up_to_u8250p(port); + struct tty_port *tport = &port->state->port; unsigned int baud, quot, frac = 0; struct ktermios *termios; + struct tty_struct *tty; unsigned long flags; - mutex_lock(&port->state->port.mutex); + tty = tty_port_tty_get(tport); + if (!tty) { + mutex_lock(&tport->mutex); + port->uartclk = uartclk; + mutex_unlock(&tport->mutex); + return; + } + + down_write(&tty->termios_rwsem); + mutex_lock(&tport->mutex); if (port->uartclk == uartclk) - goto out_lock; + goto out_unlock; port->uartclk = uartclk; - if (!tty_port_initialized(&port->state->port)) - goto out_lock; + if (!tty_port_initialized(tport)) + goto out_unlock; - termios = &port->state->port.tty->termios; + termios = &tty->termios; baud = serial8250_get_baud_rate(port, termios, NULL); quot = serial8250_get_divisor(port, baud, &frac); @@ -2726,8 +2737,10 @@ void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk) spin_unlock_irqrestore(&port->lock, flags); serial8250_rpm_put(up); -out_lock: - mutex_unlock(&port->state->port.mutex); +out_unlock: + mutex_unlock(&tport->mutex); + up_write(&tty->termios_rwsem); + tty_kref_put(tty); } EXPORT_SYMBOL_GPL(serial8250_update_uartclk); |