Commit d014ef60 authored Sep 24, 2020 by Jordan Crouse

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



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>

parent 49eff519

drivers/gpu/msm/kgsl_pool.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -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++;