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drm/crtc: only store the necessary data for set_config rollback

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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@ffwll.ch>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Philipp Zabel 2016-06-02 19:27:52 +02:00 committed by Dave Airlie
parent fffc5f59f2
commit 93f55972bc
1 changed files with 18 additions and 18 deletions
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36
drivers/gpu/drm/drm_crtc_helper.c
View file

@ -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 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
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);