NAME
ata_exec_command_pio - issue ATA command to host controller
SYNOPSIS
void ata_exec_command_pio (struct ata_port * ap,
const struct ata_taskfile * tf);
ARGUMENTS
ap port to which command is being issued
tf ATA taskfile register set
DESCRIPTION
Issues PIO write to ATA command register, with proper synchronization
with interrupt handler / other threads.
LOCKING
spin_lock_irqsave(host_set lock)
AUTHOR
Jeff Garzik.