Merge remote-tracking branch 'bonzini/scsi-next' into staging

Merge remote-tracking branch 'bonzini/scsi-next' into staging

* bonzini/scsi-next:
  virtio-scsi: use dma_context_memory
  dma: Define dma_context_memory and use in sysbus-ohci
  megasas: Correct target/lun mapping
  scsi-disk: flush cache after disabling it
  megasas: do not include block_int.h
  scsi: remove superfluous call to scsi_device_set_ua
  virtio-scsi: factor checks for VIRTIO_SCSI_S_DRIVER_OK when reporting events
  scsi: do not return short responses for emulated commands

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>