This is a note to let you know that I've just added the patch titled
drm/ttm: Fix possible division by 0 in ttm_dma_pool_shrink_scan().
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-ttm-fix-possible-division-by-0-in-ttm_dma_pool_shrink_scan.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 11e504cc705e8ccb06ac93a276e11b5e8fee4d40 Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Date: Sun, 3 Aug 2014 19:59:35 +0900
Subject: drm/ttm: Fix possible division by 0 in ttm_dma_pool_shrink_scan().
From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
commit 11e504cc705e8ccb06ac93a276e11b5e8fee4d40 upstream.
list_empty(&_manager->pools) being false before taking _manager->lock
does not guarantee that _manager->npools != 0 after taking _manager->lock
because _manager->npools is updated under _manager->lock.
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -1015,6 +1015,8 @@ ttm_dma_pool_shrink_scan(struct shrinker
return SHRINK_STOP;
mutex_lock(&_manager->lock);
+ if (!_manager->npools)
+ goto out;
pool_offset = pool_offset % _manager->npools;
list_for_each_entry(p, &_manager->pools, pools) {
unsigned nr_free;
@@ -1034,6 +1036,7 @@ ttm_dma_pool_shrink_scan(struct shrinker
p->pool->dev_name, p->pool->name, current->pid,
nr_free, shrink_pages);
}
+out:
mutex_unlock(&_manager->lock);
return freed;
}
Patches currently in stable-queue which might be from penguin-kernel@xxxxxxxxxxxxxxxxxxx are
queue-3.16/drm-ttm-fix-possible-stack-overflow-by-recursive-shrinker-calls.patch
queue-3.16/drm-ttm-fix-possible-division-by-0-in-ttm_dma_pool_shrink_scan.patch
queue-3.16/drm-ttm-choose-a-pool-to-shrink-correctly-in-ttm_dma_pool_shrink_scan.patch
queue-3.16/drm-ttm-use-mutex_trylock-to-avoid-deadlock-inside-shrinker-functions.patch
queue-3.16/drm-ttm-pass-gfp-flags-in-order-to-avoid-deadlock.patch
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