serial: switch the serial core to int put_char methods
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index f7263e1..6c7a5cf 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -422,6 +422,7 @@
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 @@
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)