From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Tue, 10 Mar 2015 16:41:35 +0000 (+0000)
Subject: ARM: dma-api: fix off-by-one error in __dma_supported()
X-Git-Tag: omap-for-v4.1/fixes-rc1~297^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8bf1268f48ad9bf5d6401b4db913e6d85b0863f6;p=pandora-kernel.git

ARM: dma-api: fix off-by-one error in __dma_supported()

When validating the mask against the amount of memory we have available
(so that we can trap 32-bit DMA addresses with >32-bits memory), we had
not taken account of the fact that max_pfn is the maximum PFN number
plus one that would be in the system.

There are several references in the code which bear this out:

mm/page_owner.c:
	for (; pfn < max_pfn; pfn++) {
	}

arch/x86/kernel/setup.c:
	high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1)

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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