[SCSI] add wrapper to access and set scsi_bus_type in struct acpi_bus_type
For being able to bind ata devices against acpi devices, scsi_bus_type needs to be set as bus in struct acpi_bus_type. So add wrapper to scsi_lib to accomplish that. Signed-off-by: NHolger Macht <holger@homac.de> Signed-off-by: NLin Ming <ming.m.lin@intel.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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