From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Wed, 28 Jan 2009 12:53:17 +0000 (+0900)
Subject: IA64: fix VT-d dma_mapping_error
X-Git-Tag: v2.6.30-rc1~614^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dfb805e831cc5306b14eacd64e0b36d0d973ee0d;p=pandora-kernel.git

IA64: fix VT-d dma_mapping_error

dma_mapping_error is used to see if dma_map_single and dma_map_page
succeed. IA64 VT-d dma_mapping_error always says that dma_map_single
is successful even though it could fail. Note that X86 VT-d works
properly in this regard.

This patch fixes IA64 VT-d dma_mapping_error by adding VT-d's own
dma_mapping_error() that works for both X86_64 and IA64. VT-d uses
zero as an error dma address so VT-d's dma_mapping_error returns 1 if
a passed dma address is zero (as x86's VT-d dma_mapping_error does
now).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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