drm/i915: Fix unload after failed initialisation

If modeset init failed we attempted to unload the module, before we
finished setting it up and so triggered various oopses.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index eee88cf..307bad0 100644 (file)
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1993,7 +1993,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
            drm_core_check_feature(dev, DRIVER_MODESET)) {
                DRM_ERROR("kernel modesetting requires GEM, disabling driver.\n");
                ret = -ENODEV;
-               goto out_iomapfree;
+               goto out_workqueue_free;
        }
 
        dev->driver->get_vblank_counter = i915_get_vblank_counter;
@@ -2016,8 +2016,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
        /* Init HWS */
        if (!I915_NEED_GFX_HWS(dev)) {
                ret = i915_init_phys_hws(dev);
-               if (ret != 0)
-                       goto out_workqueue_free;
+               if (ret)
+                       goto out_gem_unload;
        }
 
        if (IS_PINEVIEW(dev))
@@ -2044,11 +2044,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
        dev_priv->trace_irq_seqno = 0;
 
        ret = drm_vblank_init(dev, I915_NUM_PIPE);
-
-       if (ret) {
-               (void) i915_driver_unload(dev);
-               return ret;
-       }
+       if (ret)
+               goto out_gem_unload;
 
        /* Start out suspended */
        dev_priv->mm.suspended = 1;
@@ -2059,7 +2056,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
                ret = i915_load_modeset_init(dev);
                if (ret < 0) {
                        DRM_ERROR("failed to init modeset\n");
-                       goto out_workqueue_free;
+                       goto out_gem_unload;
                }
        }
 
@@ -2077,6 +2074,12 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 
        return 0;
 
+out_gem_unload:
+       if (dev->pdev->msi_enabled)
+               pci_disable_msi(dev->pdev);
+
+       intel_teardown_gmbus(dev);
+       intel_teardown_mchbar(dev);
 out_workqueue_free:
        destroy_workqueue(dev_priv->wq);
 out_iomapfree: