drm/kms: protect against fb helper not being created.
If drivers don't init the fb helper on the connector, the cmdline
code won't work, but it shouldn't crash either.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 82fd6e8..1fe4e1d 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -279,16 +279,25 @@
static bool drm_has_cmdline_mode(struct drm_connector *connector)
{
struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
- struct drm_fb_helper_cmdline_mode *cmdline_mode = &fb_help_conn->cmdline_mode;
+ struct drm_fb_helper_cmdline_mode *cmdline_mode;
+
+ if (!fb_help_conn)
+ return false;
+
+ cmdline_mode = &fb_help_conn->cmdline_mode;
return cmdline_mode->specified;
}
static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_connector *connector, int width, int height)
{
struct drm_fb_helper_connector *fb_help_conn = connector->fb_helper_private;
- struct drm_fb_helper_cmdline_mode *cmdline_mode = &fb_help_conn->cmdline_mode;
+ struct drm_fb_helper_cmdline_mode *cmdline_mode;
struct drm_display_mode *mode = NULL;
+ if (!fb_help_conn)
+ return mode;
+
+ cmdline_mode = &fb_help_conn->cmdline_mode;
if (cmdline_mode->specified == false)
return mode;