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>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index f7263e104d81..6c7a5cf76582 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)