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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2008-04-30 00:54:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 08:29:47 -0700
commit23d22cea85ba9114a59a32ca8dfb1e2aef52a278 (patch)
tree300a122ecc3583454058de7c2a7c01a7a2322cef /drivers/serial
parent56dbbb9a5704f665068778d4d2c1bdf757756e60 (diff)
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>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/serial_core.c12
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)