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From: Jason Wessel on 12 Feb 2010 17:50
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(a)windriver.com>
Acked-by: Paul Mundt <lethal(a)linux-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 42f3333..2cf3b6d 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

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Prev: [PATCH 01/28] Move kernel/kgdb.c to kernel/debug/debug_core.c
Next: [PATCH 2/7] drm: add KGDB/KDB support Add support for KDB entry/exit.