drm/i915: introduce struct intel_set_config

intel_crtc_set_config is an unwidly beast and is in serious need of
some function extraction. To facilitate that, introduce a struct to
keep track of all the state involved. Atm it doesn't do much more than
keep track of all the allocated memory.

v2: Apply some bikeshed to intel_set_config_free, as suggested by
Jesse Barnes.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 090ba2d..f77140d 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6723,17 +6723,29 @@ done:
        return ret;
 }
 
+static void intel_set_config_free(struct intel_set_config *config)
+{
+       if (!config)
+               return;
+
+       kfree(config->save_connectors);
+       kfree(config->save_encoders);
+       kfree(config->save_crtcs);
+       kfree(config);
+}
+
 static int intel_crtc_set_config(struct drm_mode_set *set)
 {
        struct drm_device *dev;
-       struct drm_crtc *save_crtcs, *new_crtc, *crtc;
-       struct drm_encoder *save_encoders, *new_encoder, *encoder;
+       struct drm_crtc *new_crtc, *crtc;
+       struct drm_encoder *new_encoder, *encoder;
        struct drm_framebuffer *old_fb = NULL;
        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;
        struct drm_mode_set save_set;
+       struct intel_set_config *config;
        int ret;
        int i;
 
@@ -6762,27 +6774,27 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
 
        dev = set->crtc->dev;
 
+       ret = -ENOMEM;
+       config = kzalloc(sizeof(*config), GFP_KERNEL);
+       if (!config)
+               goto out_config;
+
        /* Allocate space for the backup of all (non-pointer) crtc, encoder and
         * connector data. */
-       save_crtcs = kzalloc(dev->mode_config.num_crtc *
-                            sizeof(struct drm_crtc), GFP_KERNEL);
-       if (!save_crtcs)
-               return -ENOMEM;
+       config->save_crtcs = kzalloc(dev->mode_config.num_crtc *
+                                    sizeof(struct drm_crtc), GFP_KERNEL);
+       if (!config->save_crtcs)
+               goto out_config;
 
-       save_encoders = kzalloc(dev->mode_config.num_encoder *
-                               sizeof(struct drm_encoder), GFP_KERNEL);
-       if (!save_encoders) {
-               kfree(save_crtcs);
-               return -ENOMEM;
-       }
+       config->save_encoders = kzalloc(dev->mode_config.num_encoder *
+                                       sizeof(struct drm_encoder), GFP_KERNEL);
+       if (!config->save_encoders)
+               goto out_config;
 
-       save_connectors = kzalloc(dev->mode_config.num_connector *
-                               sizeof(struct drm_connector), GFP_KERNEL);
-       if (!save_connectors) {
-               kfree(save_crtcs);
-               kfree(save_encoders);
-               return -ENOMEM;
-       }
+       config->save_connectors = kzalloc(dev->mode_config.num_connector *
+                                         sizeof(struct drm_connector), GFP_KERNEL);
+       if (!config->save_connectors)
+               goto out_config;
 
        /* Copy data. Note that driver private data is not affected.
         * Should anything bad happen only the expected state is
@@ -6790,17 +6802,17 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
         */
        count = 0;
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
-               save_crtcs[count++] = *crtc;
+               config->save_crtcs[count++] = *crtc;
        }
 
        count = 0;
        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
-               save_encoders[count++] = *encoder;
+               config->save_encoders[count++] = *encoder;
        }
 
        count = 0;
        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
-               save_connectors[count++] = *connector;
+               config->save_connectors[count++] = *connector;
        }
 
        save_set.crtc = set->crtc;
@@ -6936,26 +6948,25 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
                }
        }
 
-       kfree(save_connectors);
-       kfree(save_encoders);
-       kfree(save_crtcs);
+       intel_set_config_free(config);
+
        return 0;
 
 fail:
        /* Restore all previous data. */
        count = 0;
        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
-               *crtc = save_crtcs[count++];
+               *crtc = config->save_crtcs[count++];
        }
 
        count = 0;
        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
-               *encoder = save_encoders[count++];
+               *encoder = config->save_encoders[count++];
        }
 
        count = 0;
        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
-               *connector = save_connectors[count++];
+               *connector = config->save_connectors[count++];
        }
 
        /* Try to restore the config */
@@ -6964,9 +6975,8 @@ fail:
                            save_set.x, save_set.y, save_set.fb))
                DRM_ERROR("failed to restore config after modeset failure\n");
 
-       kfree(save_connectors);
-       kfree(save_encoders);
-       kfree(save_crtcs);
+out_config:
+       intel_set_config_free(config);
        return ret;
 }
 

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c080c82..1cb64dd 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -423,6 +423,12 @@ extern void intel_panel_disable_backlight(struct drm_device *dev);
 extern void intel_panel_destroy_backlight(struct drm_device *dev);
 extern enum drm_connector_status intel_panel_detect(struct drm_device *dev);
 
+struct intel_set_config {
+       struct drm_connector *save_connectors;
+       struct drm_encoder *save_encoders;
+       struct drm_crtc *save_crtcs;
+};
+
 extern bool intel_set_mode(struct drm_crtc *crtc, struct drm_display_mode *mode,
                           int x, int y, struct drm_framebuffer *old_fb);
 extern void intel_crtc_load_lut(struct drm_crtc *crtc);