drm/i915: Fix oops on HWS unload

Freeing the Hardware Status Page was writing to the HWS register in
order to disable the GPU writing to the HWS page. Unfortunately, we were
writing to the mmio register after unmapping the register space, hence
the oops.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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 f451af6..2caf43d 100644 (file)
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -2133,9 +2133,6 @@ int i915_driver_unload(struct drm_device *dev)
        if (dev->pdev->msi_enabled)
                pci_disable_msi(dev->pdev);
 
-       if (dev_priv->regs != NULL)
-               iounmap(dev_priv->regs);
-
        intel_opregion_fini(dev);
 
        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
@@ -2157,6 +2154,9 @@ int i915_driver_unload(struct drm_device *dev)
                        i915_free_hws(dev);
        }
 
+       if (dev_priv->regs != NULL)
+               iounmap(dev_priv->regs);
+
        intel_teardown_gmbus(dev);
        intel_teardown_mchbar(dev);