From 8b7dc1fe1a5c1093551f6cd7dfbb941bd9081c2e Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 23 Oct 2020 09:46:55 +0200
Subject: [PATCH] drm/amd/display: Don't invoke kgdb_breakpoint() unconditionally
Git-commit: 8b7dc1fe1a5c1093551f6cd7dfbb941bd9081c2e
Patch-mainline: v5.10-rc2
References: git-fixes

ASSERT_CRITICAL() invokes kgdb_breakpoint() whenever either
CONFIG_KGDB or CONFIG_HAVE_KGDB is set.  This, however, may lead to a
kernel panic when no kdb stuff is attached, since the
kgdb_breakpoint() call issues INT3.  It's nothing but a surprise for
normal end-users.

For avoiding the pitfall, make the kgdb_breakpoint() call only when
CONFIG_DEBUG_KERNEL_DC is set.

https://bugzilla.opensuse.org/show_bug.cgi?id=1177973

Cc: <stable@vger.kernel.org>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

---
 drivers/gpu/drm/amd/display/dc/os_types.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/os_types.h b/drivers/gpu/drm/amd/display/dc/os_types.h
index 330acaaed79a..32758b245754 100644
--- a/drivers/gpu/drm/amd/display/dc/os_types.h
+++ b/drivers/gpu/drm/amd/display/dc/os_types.h
@@ -94,7 +94,7 @@
  * general debug capabilities
  *
  */
-#if defined(CONFIG_HAVE_KGDB) || defined(CONFIG_KGDB)
+#if defined(CONFIG_DEBUG_KERNEL_DC) && (defined(CONFIG_HAVE_KGDB) || defined(CONFIG_KGDB))
 #define ASSERT_CRITICAL(expr) do {	\
 	if (WARN_ON(!(expr))) { \
 		kgdb_breakpoint(); \
-- 
2.16.4