[PATCH 14/37] sh, sh-sci: Use NO_POLL_CHAR in the SCIF polled console code

[jason.wessel at windriver.com (Jason Wessel)]

The sci_poll_get_char() needs to return immediately if there is no
input from the chip to process, and must return a value of
NO_POLL_CHAR.

This allows kgdboc to process multiple polled devices while kgdb is
active.

CC: Paul Mundt <lethal at linux-sh.org>
Signed-off-by: Jason Wessel <jason.wessel at windriver.com>
---
 drivers/serial/sh-sci.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 68c7f6c..ab020eb 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -126,7 +126,11 @@ static int sci_poll_get_char(struct uart_port *port)
 			handle_error(port);
 			continue;
 		}
-	} while (!(status & SCxSR_RDxF(port)));
+		break;
+	} while (1);
+
+	if (!(status & SCxSR_RDxF(port)))
+		return NO_POLL_CHAR;
 
 	c = sci_in(port, SCxRDR);
 
-- 
1.6.4.rc1