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msm: kgsl: Make sure that pool pages don't have any extra references

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Before putting a page back in the pool be sure that it doesn't have
any additional references that would be a signal that somebody else
is looking at the page and that it would be a bad idea to keep it
around and run the risk of accidentally handing it to a different
process.

Change-Id: Ic0dedbad0cf2ffb34b76ad23e393c5a911114b82
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
This commit is contained in:
Jordan Crouse 2020-09-24 09:24:12 -06:00
commit d014ef6064
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/msm/kgsl_pool.c
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@ -96,6 +96,15 @@ _kgsl_pool_add_page(struct kgsl_page_pool *pool, struct page *p)
if (!p)
return;
/*
* Sanity check to make sure we don't re-pool a page that
* somebody else has a reference to.
*/
if (WARN_ON(unlikely(page_count(p) > 1))) {
__free_pages(p, pool->pool_order);
return;
}
spin_lock(&pool->list_lock);
list_add_tail(&p->lru, &pool->page_list);
pool->page_count++;