From 3176b3a9ebc2598e8efb31c3fc89634cc202a862 Mon Sep 17 00:00:00 2001
From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Wed, 17 Jan 2018 23:52:03 -0500
Subject: [PATCH] drm/ttm: Don't add swapped BOs to swap-LRU list
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commit fd5002d6a3c602664b07668a24df4ef7a43bf078 upstream.

A BO that's already swapped would be added back to the swap-LRU list
for example if its validation failed under high memory pressure. This
could later lead to swapping it out again and leaking previous swap
storage.

This commit adds a condition to prevent that from happening.

v2: Check page_flags instead of swap_storage

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[bwh: Backported to 3.2: We aren't checking for TTM_PAGE_FLAG_SG here as that's
 not defined]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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