From: Stefan Richter <stefanr@s5r6.in-berlin.de>
Date: Wed, 14 Oct 2009 18:40:10 +0000 (+0200)
Subject: firewire: ohci: 0 may be a valid DMA address
X-Git-Tag: v2.6.33-rc1~383^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=19593ffdb6daa6ba691d247a2400cece12687c52;p=pandora-kernel.git

firewire: ohci: 0 may be a valid DMA address

I was told that there are obscure architectures with non-coherent DMA
which may DMA-map to bus address 0.  We shall not use 0 as a magic
number of uninitialized bus address variables.

The packet->payload_length > 0 test cannot be used either (except in
at_context_queue_packet) because local requests are not DMA-mapped
regardless of payload_length.  Hence add a state flag to struct
fw_packet.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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