From 625365c9dc9e5b25835874d810ee468613c3df75 Mon Sep 17 00:00:00 2001
From: Zack Rusin <zackr@vmware.com>
Date: Wed, 2 Mar 2022 10:24:24 -0500
Subject: drm/vmwgfx: Initialize drm_mode_fb_cmd2
Git-commit: 3059d9b9f6aa433a55b9d0d21b566396d5497c33
Patch-mainline: v5.18-rc7
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
Transition to drm_mode_fb_cmd2 from drm_mode_fb_cmd left the structure
unitialized. drm_mode_fb_cmd2 adds a few additional members, e.g. flags
and modifiers which were never initialized. Garbage in those members
can cause random failures during the bringup of the fbcon.
Initializing the structure fixes random blank screens after bootup due
to flags/modifiers mismatches during the fbcon bring up.
Fixes: dabdcdc9822a ("drm/vmwgfx: Switch to mode_cmd2")
Signed-off-by: Zack Rusin <zackr@vmware.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: <stable@vger.kernel.org> # v4.10+
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Reviewed-by: Maaz Mombasawala <mombasawalam@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220302152426.885214-7-zack@kde.org
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/vmwgfx/vmwgfx_fb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
index 8ee34576c7d0..adf17c740656 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fb.c
@@ -483,7 +483,7 @@ static int vmw_fb_kms_detach(struct vmw_fb_par *par,
static int vmw_fb_kms_framebuffer(struct fb_info *info)
{
- struct drm_mode_fb_cmd2 mode_cmd;
+ struct drm_mode_fb_cmd2 mode_cmd = {0};
struct vmw_fb_par *par = info->par;
struct fb_var_screeninfo *var = &info->var;
struct drm_framebuffer *cur_fb;
--
2.38.1