drm/i915: Decouple the object from the unbound list before freeing pages

As we may actually allocate in order to save the physical swizzling bits
during the free, we have to be careful not to trigger the shrinker on
the same object.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Added a small comment in the code to really drive the
scariness of this patch home.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 4ef8b57..c1f6919 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1696,10 +1696,14 @@ i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
        if (obj->pages_pin_count)
                return -EBUSY;
 
+       /* ->put_pages might need to allocate memory for the bit17 swizzle
+        * array, hence protect them from being reaped by removing them from gtt
+        * lists early. */
+       list_del(&obj->gtt_list);
+
        ops->put_pages(obj);
        obj->pages = NULL;
 
-       list_del(&obj->gtt_list);
        if (i915_gem_object_is_purgeable(obj))
                i915_gem_object_truncate(obj);