drm: tweak getconnector locking

We need to hold connection_mutex as we read the properties.  Easiest
thing is just widen the scope where connection_mutex is held.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 303c991..2031ead 100644 (file)
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2031,6 +2031,7 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
        DRM_DEBUG_KMS("[CONNECTOR:%d:?]\n", out_resp->connector_id);
 
        mutex_lock(&dev->mode_config.mutex);
+       drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 
        connector = drm_connector_find(dev, out_resp->connector_id);
        if (!connector) {
@@ -2062,14 +2063,11 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
        out_resp->mm_height = connector->display_info.height_mm;
        out_resp->subpixel = connector->display_info.subpixel_order;
        out_resp->connection = connector->status;
-       drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
-
        encoder = drm_connector_get_encoder(connector);
        if (encoder)
                out_resp->encoder_id = encoder->base.id;
        else
                out_resp->encoder_id = 0;
-       drm_modeset_unlock(&dev->mode_config.connection_mutex);
 
        /*
         * This ioctl is called twice, once to determine how much space is
@@ -2135,6 +2133,7 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
        out_resp->count_encoders = encoders_count;
 
 out:
+       drm_modeset_unlock(&dev->mode_config.connection_mutex);
        mutex_unlock(&dev->mode_config.mutex);
 
        return ret;