From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Sun, 3 Aug 2014 11:02:03 +0000 (+0900)
Subject: drm/ttm: Fix possible stack overflow by recursive shrinker calls.
X-Git-Tag: v3.2.64~185
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=312b559d9e61b473b39d3dc05fe0db43c2df60fb;p=pandora-kernel.git

drm/ttm: Fix possible stack overflow by recursive shrinker calls.

commit 71336e011d1d2312bcbcaa8fcec7365024f3a95d upstream.

While ttm_dma_pool_shrink_scan() tries to take mutex before doing GFP_KERNEL
allocation, ttm_pool_shrink_scan() does not do it. This can result in stack
overflow if kmalloc() in ttm_page_pool_free() triggered recursion due to
memory pressure.

  shrink_slab()
  => ttm_pool_shrink_scan()
     => ttm_page_pool_free()
        => kmalloc(GFP_KERNEL)
           => shrink_slab()
              => ttm_pool_shrink_scan()
                 => ttm_page_pool_free()
                    => kmalloc(GFP_KERNEL)

Change ttm_pool_shrink_scan() to do like ttm_dma_pool_shrink_scan() does.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Dave Airlie <airlied@redhat.com>
[bwh: Backported to 3.2:
 - Adjust context
 - Change return value in the contended case to follow the old shrinker
   API]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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