From: Jason Wessel <jason.wessel@windriver.com>
Date: Thu, 5 Aug 2010 14:22:25 +0000 (-0500)
Subject: debug_core,kdb: fix crash when arch does not have single step
X-Git-Tag: v3.0~4121^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3fa43aba08c5b5a4b407e402606fbe463239b14a;p=platform%2Fkernel%2Flinux-amlogic.git

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>
---

diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 8bc5eef..9ed9307 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);