From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Fri, 6 Dec 2013 12:30:42 +0000 (+0000)
Subject: ARM: another fix for the DMA mapping checks
X-Git-Tag: v3.13-rc4~9^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9f28cde0bc643186d32744ce69d12222e8588fe7;p=pandora-kernel.git

ARM: another fix for the DMA mapping checks

Peter reports that OMAP audio broke with the recent fix for these
checks, caused by OMAP audio using a 64-bit DMA mask.  We should
allow 64-bit DMA masks even with 32-bit dma_addr_t if we can be sure
the amount of RAM we have won't allow the 32-bit dma_addr_t to
overflow.  Unfortunately, the checks to detect overflow were not
correct.

Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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