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H A Dpci.cc29947bbb0978d312074ec73be968bfab1b6c977 Fri Nov 26 15:44:53 UTC 2010 Kevin Wolf <kwolf@redhat.com> ide: Ignore double DMA transfer starts/stops

You can only start a DMA transfer if it's not running yet, and you can only
cancel it if it's running.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>