sh,sh-sci: Use NO_POLL_CHAR in the SCIF polled console code

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.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 8d993c4cceac..f250a610a268 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -151,7 +151,11 @@ 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);