From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: [PATCH] serial: switch the serial core to int put_char methods
Date: Sun, 13 Apr 2008 18:27:32 +0100 [thread overview]
Message-ID: <20080413182732.6536d8d8@core> (raw)
Signed-off-by: Alan Cox <alan@redhat.com>
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-rc8-mm2/drivers/serial/serial_core.c linux-2.6.25-rc8-mm2/drivers/serial/serial_core.c
--- linux.vanilla-2.6.25-rc8-mm2/drivers/serial/serial_core.c 2008-04-13 15:36:54.000000000 +0100
+++ linux-2.6.25-rc8-mm2/drivers/serial/serial_core.c 2008-04-13 16:00:06.000000000 +0100
@@ -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)
reply other threads:[~2008-04-13 17:31 UTC|newest]
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