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drm/kms: protect against fb helper not being created.

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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>
This commit is contained in:
Dave Airlie
2009-09-26 06:39:00 +10:00
parent adea4796cf
commit 8ef8678c8f
2 changed files with 23 additions and 4 deletions
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13
drivers/gpu/drm/drm_crtc_helper.c
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@@ -279,16 +279,25 @@ static struct drm_display_mode *drm_has_preferred_mode(struct drm_connector *con
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;