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Commit 9968fcdd authored by Kamal Agrawal's avatar Kamal Agrawal
Browse files

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: default avatarJordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: default avatarKamal Agrawal <quic_kamaagra@quicinc.com>
parent 114c9c6c

drivers/gpu/msm/kgsl_pool.c

+10 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2016-2021, The Linux Foundation. All rights reserved.

 * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.

 */



#include <asm/cacheflush.h>
@@ -61,6 +62,15 @@ _kgsl_get_pool_from_order(unsigned int order) 
static void

_kgsl_pool_add_page(struct kgsl_page_pool *pool, struct page *p)

{

	/*

	 * Sanity check to make sure we don't re-pool a page that

	 * somebody else has a reference to.

	 */

	if (WARN_ON_ONCE(unlikely(page_count(p) > 1))) {

		__free_pages(p, pool->pool_order);

		return;

	}



	kgsl_zero_page(p, pool->pool_order);



	spin_lock(&pool->list_lock);