commit 4bdee6c5 upstream

sata_mv allowed issuing two DMA commands concurrently which the
hardware allows.  Unfortunately, libata core layer isn't ready for
this yet and spews ugly warning message and malfunctions on this.
Don't allow concurrent DMA commands for now.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Cc: Martin Michlmayr <tbm@cyrius.com>
Cc: Mark Lord <liml@rtr.ca>
Cc: Artem Bokhan <aptem@ngs.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>