linux-kernel - [PATCH 11/25] sh,sh-sci: Use NO_POLL_CHAR in the SCIF polled console code

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Date:	Tue, 18 May 2010 20:39:21 -0500
From:	Jason Wessel <jason.wessel@...driver.com>
To:	torvalds@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net,
	Jason Wessel <jason.wessel@...driver.com>
Subject: [PATCH 11/25] 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@...driver.com>
Acked-by: Paul Mundt <lethal@...ux-sh.org>
---
 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 8eb094c..725301f 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -150,7 +150,11 @@ 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);
 
-- 
1.6.3.3

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