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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.