ata_scsi_find_dev — lookup ata_device from scsi_cmnd
|struct ata_port * ap,|
|const struct scsi_device * scsidev|
ATA port to which the device is attached
SCSI device from which we derive the ATA device
Given various information provided in struct scsi_cmnd, map that onto an ATA bus, and using that mapping determine which ata_device is associated with the SCSI command to be sent.
LOCKING: spin_lock_irqsave(host lock)