ata_scsi_qc_new — acquire new ata_queued_cmd reference
|struct ata_device * dev,|
|struct scsi_cmnd * cmd|
ATA device to which the new command is attached
SCSI command that originated this ATA command
Obtain a reference to an unused ata_queued_cmd structure, which is the basic libata structure representing a single ATA command sent to the hardware.
If a command was available, fill in the SCSI-specific portions of the structure with information on the current command.
LOCKING: spin_lock_irqsave(host lock)