drm/msm: Use labels for unwinding in the error path

This simplifies cleanup, to make sure nothing drops out in case of
error.

Changes in v3:
- None

Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>
[seanpaul split out of dpu megapatch and renamed labels]
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 6781654..8bd9fe8 100644 (file)
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -372,19 +372,16 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 
        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
        if (!priv) {
-               drm_dev_unref(ddev);
-               return -ENOMEM;
+               ret = -ENOMEM;
+               goto err_unref_drm_dev;
        }
 
        ddev->dev_private = priv;
        priv->dev = ddev;
 
        ret = mdp5_mdss_init(ddev);
-       if (ret) {
-               kfree(priv);
-               drm_dev_unref(ddev);
-               return ret;
-       }
+       if (ret)
+               goto err_free_priv;
 
        mdss = priv->mdss;
 
@@ -399,17 +396,12 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 
        /* Bind all our sub-components: */
        ret = component_bind_all(dev, ddev);
-       if (ret) {
-               if (mdss && mdss->funcs)
-                       mdss->funcs->destroy(ddev);
-               kfree(priv);
-               drm_dev_unref(ddev);
-               return ret;
-       }
+       if (ret)
+               goto err_destroy_mdss;
 
        ret = msm_init_vram(ddev);
        if (ret)
-               goto fail;
+               goto err_msm_uninit;
 
        msm_gem_shrinker_init(ddev);
 
@@ -435,7 +427,7 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
                 */
                dev_err(dev, "failed to load kms\n");
                ret = PTR_ERR(kms);
-               goto fail;
+               goto err_msm_uninit;
        }
 
        /* Enable normalization of plane zpos */
@@ -445,7 +437,7 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
                ret = kms->funcs->hw_init(kms);
                if (ret) {
                        dev_err(dev, "kms hw init failed: %d\n", ret);
-                       goto fail;
+                       goto err_msm_uninit;
                }
        }
 
@@ -455,7 +447,7 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
        ret = drm_vblank_init(ddev, priv->num_crtcs);
        if (ret < 0) {
                dev_err(dev, "failed to initialize vblank\n");
-               goto fail;
+               goto err_msm_uninit;
        }
 
        if (kms) {
@@ -464,13 +456,13 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
                pm_runtime_put_sync(dev);
                if (ret < 0) {
                        dev_err(dev, "failed to install IRQ handler\n");
-                       goto fail;
+                       goto err_msm_uninit;
                }
        }
 
        ret = drm_dev_register(ddev, 0);
        if (ret)
-               goto fail;
+               goto err_msm_uninit;
 
        drm_mode_config_reset(ddev);
 
@@ -481,15 +473,23 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 
        ret = msm_debugfs_late_init(ddev);
        if (ret)
-               goto fail;
+               goto err_msm_uninit;
 
        drm_kms_helper_poll_init(ddev);
 
        return 0;
 
-fail:
+err_msm_uninit:
        msm_drm_uninit(dev);
        return ret;
+err_destroy_mdss:
+       if (mdss && mdss->funcs)
+               mdss->funcs->destroy(ddev);
+err_free_priv:
+       kfree(priv);
+err_unref_drm_dev:
+       drm_dev_unref(ddev);
+       return ret;
 }
 
 /*