From 3fa43aba08c5b5a4b407e402606fbe463239b14a Mon Sep 17 00:00:00 2001
From: Jason Wessel <jason.wessel@windriver.com>
Date: Thu, 5 Aug 2010 09:22:25 -0500
Subject: [PATCH] debug_core,kdb: fix crash when arch does not have single step
When an arch such as mips and microblaze does not implement either HW
or software single stepping the debug core should re-enter kdb. The
kdb code will properly ignore the single step operation. Attempting
to single step the kernel without software or hardware support causes
unpredictable kernel crashes.
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
---
kernel/debug/debug_core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 8bc5eeffec8a..9ed9307615d9 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -605,6 +605,8 @@ cpu_master_loop:
if (dbg_kdb_mode) {
kgdb_connected = 1;
error = kdb_stub(ks);
+ if (error == -1)
+ continue;
kgdb_connected = 0;
} else {
error = gdb_serial_stub(ks);
--
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