diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/serial_core.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index f7263e104d8..6c7a5cf7658 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -422,6 +422,7 @@ uart_get_divisor(struct uart_port *port, unsigned int baud) EXPORT_SYMBOL(uart_get_divisor); +/* FIXME: Consistent locking policy */ static void uart_change_speed(struct uart_state *state, struct ktermios *old_termios) { @@ -454,27 +455,30 @@ uart_change_speed(struct uart_state *state, struct ktermios *old_termios) port->ops->set_termios(port, termios, old_termios); } -static inline void +static inline int __uart_put_char(struct uart_port *port, struct circ_buf *circ, unsigned char c) { unsigned long flags; + int ret = 0; if (!circ->buf) - return; + return 0; spin_lock_irqsave(&port->lock, flags); if (uart_circ_chars_free(circ) != 0) { circ->buf[circ->head] = c; circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); + ret = 1; } spin_unlock_irqrestore(&port->lock, flags); + return ret; } -static void uart_put_char(struct tty_struct *tty, unsigned char ch) +static int uart_put_char(struct tty_struct *tty, unsigned char ch) { struct uart_state *state = tty->driver_data; - __uart_put_char(state->port, &state->info->xmit, ch); + return __uart_put_char(state->port, &state->info->xmit, ch); } static void uart_flush_chars(struct tty_struct *tty) |