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Commit 65e0280a authored by Shiraz Hashim's avatar Shiraz Hashim
Browse files

drivers: dma-removed: Don't free prohibited memmap entries 



The mm subsystem access page structs aligned to
pageblock_nr_pages and assumes that these are valid. We
must not free any memmap entries that it may inspect.

CRs-Fixed: 1000343
Change-Id: I73e0402ee72cad8df307ece1134f9e7304125cf6
Signed-off-by: default avatarShiraz Hashim <shashim@codeaurora.org>
parent ec82f6fd

drivers/base/dma-removed.c

+3 −1
Original line number Diff line number Diff line 
/*

 *

 *  Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.

 *  Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.

 *  Copyright (C) 2000-2004 Russell King

 *

 * This program is free software; you can redistribute it and/or modify
@@ -134,6 +134,8 @@ static void free_memmap(unsigned long start_pfn, unsigned long end_pfn) 
	struct page *start_pg, *end_pg;

	unsigned long pg, pgend;



	start_pfn = ALIGN(start_pfn, pageblock_nr_pages);

	end_pfn = round_down(end_pfn, pageblock_nr_pages);

	/*

	 * Convert start_pfn/end_pfn to a struct page pointer.

	 */