[PATCH 4/7] kgdboc, 8250: Add the rx polling hook to 8250 driver

[Jason Wessel <jason.wessel@windriver.com>]

The RX polling hook allows the debugger to hook character input so as
to allow entry to the kernel debugger with a control-c as an example.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
---
 drivers/serial/8250.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 303272a..4f7343e 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -1361,6 +1361,10 @@ receive_chars(struct uart_8250_port *up, unsigned int *status)
 			else if (lsr & UART_LSR_FE)
 				flag = TTY_FRAME;
 		}
+#ifdef CONFIG_CONSOLE_POLL
+		if (up->port.poll_rx_cb && up->port.poll_rx_cb(ch))
+			goto ignore_char;
+#endif
 		if (uart_handle_sysrq_char(&up->port, ch))
 			goto ignore_char;
 
-- 
1.6.0.2