drm/radeon/kms/pm: fix segfault in clock code

Make sure we have a crtc assigned to the encoder
before dereferencing it.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 6458d52be4ee..a4b57493aa78 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -279,7 +279,8 @@ void radeon_pm_compute_clocks(struct radeon_device *rdev)
         list_for_each_entry(connector,
                 &ddev->mode_config.connector_list, head) {
                 if (connector->encoder &&
-                        connector->dpms != DRM_MODE_DPMS_OFF) {
+                    connector->encoder->crtc &&
+                    connector->dpms != DRM_MODE_DPMS_OFF) {
                         radeon_crtc = to_radeon_crtc(connector->encoder->crtc);
                         rdev->pm.active_crtcs |= (1 << radeon_crtc->crtc_id);
                         ++count;