dma.c merged from xen-unstable 17318:b5fea3aeb04b

dma.c merged from xen-unstable 17318:b5fea3aeb04b

changesets included:

    changeset:   14912:c1d3f4fbfacf7ea8eab9549823787f13efa2d976
    user:        Christian Limpach <Christian.Limpach@xensource.com>
    date:        Tue Apr 24 17:02:10 2007 +0100
    files:       tools/ioemu/hw/dma.c
    description:
    [qemu-dm] Check for null pointer in dma handler function pointer.

    Signed-off-by: Christian Limpach <Christian.Limpach@xensource.com>
    changeset:   16936:3daab9b636c121bc9d957568ea135b2f40776ca5
    user:        Keir Fraser <keir.fraser@citrix.com>
    date:        Wed Jan 30 09:33:26 2008 +0000
    files:       tools/ioemu/hw/dma.c tools/ioemu/hw/sb16.c
    description:
    ioemu: Better fix for SB16 infinite looping.

    Qemu upstream solves "Fix an infinite loop in the emulated SB16
    device" issue differently as stated in [2]

    [1] http://xenbits.xensource.com/xen-3.1-testing.hg?rev/4b22d472bda6
    [2] http://lists.gnu.org/archive/html/qemu-devel/2008-01/msg00709.html

    Signed-off-by: S. Caglar Onur <caglar@pardus.org.tr>