NAME
ata_qc_issue - issue taskfile to device
SYNOPSIS
int ata_qc_issue (struct ata_queued_cmd * qc);
ARGUMENTS
qc command to issue to device
DESCRIPTION
Prepare an ATA command to submission to device. This includes mapping
the data into a DMA-able area, filling in the S/G table, and finally
writing the taskfile to hardware, starting the command.
LOCKING
spin_lock_irqsave(host_set lock)
RETURNS
Zero on success, negative on error.
AUTHOR
Jeff Garzik.