drm/i915/userptr: Remove superfluous interruptible=false on waiting

Inside the kthread context, we can't be interrupted by signals so
touching the mm.interruptible flag is pointless and wait-request now
consumes EIO itself.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470388464-28458-4-git-send-email-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_gem_userptr.c

@@ -84,16 +84,9 @@ static void cancel_userptr(struct work_struct *work)
 	obj->userptr.work = NULL;
 
 	if (obj->pages != NULL) {
-		struct drm_i915_private *dev_priv = to_i915(dev);
-		bool was_interruptible;
-
-		was_interruptible = dev_priv->mm.interruptible;
-		dev_priv->mm.interruptible = false;
-
+		/* We are inside a kthread context and can't be interrupted */
 		WARN_ON(i915_gem_object_unbind(obj));
 		WARN_ON(i915_gem_object_put_pages(obj));
-
-		dev_priv->mm.interruptible = was_interruptible;
 	}
 
 	i915_gem_object_put(obj);