On Thu, Jun 02, 2016 at 07:27:52PM +0200, Philipp Zabel wrote:
> drm_crtc_helper_set_config only potentially touches connector->encoder
> and encoder->crtc, so we only have to store those for all connectors
> and encoders, respectively.
>
> Suggested-by: Daniel Vetter <daniel@xxxxxxxx>
> Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/drm_crtc_helper.c | 36 ++++++++++++++++++------------------
> 1 file changed, 18 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
> index 1c4d674..26feb2f 100644
> --- a/drivers/gpu/drm/drm_crtc_helper.c
> +++ b/drivers/gpu/drm/drm_crtc_helper.c
> @@ -528,11 +528,11 @@ drm_crtc_helper_disable(struct drm_crtc *crtc)
> int drm_crtc_helper_set_config(struct drm_mode_set *set)
> {
> struct drm_device *dev;
> - struct drm_crtc *new_crtc;
> - struct drm_encoder *save_encoders, *new_encoder, *encoder;
> + struct drm_crtc **save_encoder_crtcs, *new_crtc;
> + struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
> bool mode_changed = false; /* if true do a full mode set */
> bool fb_changed = false; /* if true and !mode_changed just do a flip */
> - struct drm_connector *save_connectors, *connector;
> + struct drm_connector *connector;
> int count = 0, ro, fail = 0;
> const struct drm_crtc_helper_funcs *crtc_funcs;
> struct drm_mode_set save_set;
> @@ -574,15 +574,15 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
> * Allocate space for the backup of all (non-pointer) encoder and
> * connector data.
> */
> - save_encoders = kzalloc(dev->mode_config.num_encoder *
> - sizeof(struct drm_encoder), GFP_KERNEL);
> - if (!save_encoders)
> + save_encoder_crtcs = kzalloc(dev->mode_config.num_encoder *
> + sizeof(struct drm_crtc *), GFP_KERNEL);
> + if (!save_encoder_crtcs)
> return -ENOMEM;
>
> - save_connectors = kzalloc(dev->mode_config.num_connector *
> - sizeof(struct drm_connector), GFP_KERNEL);
> - if (!save_connectors) {
> - kfree(save_encoders);
> + save_connector_encoders = kzalloc(dev->mode_config.num_connector *
> + sizeof(struct drm_encoder *), GFP_KERNEL);
> + if (!save_connector_encoders) {
> + kfree(save_encoder_crtcs);
> return -ENOMEM;
> }
>
> @@ -593,12 +593,12 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
> */
> count = 0;
> drm_for_each_encoder(encoder, dev) {
> - save_encoders[count++] = *encoder;
> + save_encoder_crtcs[count++] = encoder->crtc;
> }
>
> count = 0;
> drm_for_each_connector(connector, dev) {
> - save_connectors[count++] = *connector;
> + save_connector_encoders[count++] = connector->encoder;
> }
>
> save_set.crtc = set->crtc;
> @@ -758,20 +758,20 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
> }
> }
>
> - kfree(save_connectors);
> - kfree(save_encoders);
> + kfree(save_connector_encoders);
> + kfree(save_encoder_crtcs);
> return 0;
>
> fail:
> /* Restore all previous data. */
> count = 0;
> drm_for_each_encoder(encoder, dev) {
> - *encoder = save_encoders[count++];
> + encoder->crtc = save_encoder_crtcs[count++];
> }
>
> count = 0;
> drm_for_each_connector(connector, dev) {
> - *connector = save_connectors[count++];
> + connector->encoder = save_connector_encoders[count++];
> }
>
> /* after fail drop reference on all unbound connectors in set, let
> @@ -789,8 +789,8 @@ fail:
> save_set.y, save_set.fb))
> DRM_ERROR("failed to restore config after modeset failure\n");
>
> - kfree(save_connectors);
> - kfree(save_encoders);
> + kfree(save_connector_encoders);
> + kfree(save_encoder_crtcs);
> return ret;
> }
> EXPORT_SYMBOL(drm_crtc_helper_set_config);
> --
> 2.8.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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