[PATCH 2/3] libata: add another IRQ calls (libata drivers)

[Jeff Garzik]

Akira Iguchi wrote:
> This patch is against each libata driver.
> 
> Two IRQ calls are added in ata_port_operations.
> - irq_on() is used to enable interrupts. 
> - irq_ack() is used to acknowledge a device interrupt.
> 
> In most drivers, ata_irq_on() and ata_irq_ack() are used for
> irq_on and irq_ack respectively. 
> 
> In some drivers (ex: ahci, sata_sil24) which cannot use them
> as is, ata_dummy_irq_on() and ata_dummy_irq_ack() are used.
> 
> Signed-off-by: Kou Ishizaki <kou.ishizaki at toshiba.co.jp>
> Signed-off-by: Akira Iguchi <akira2.iguchi at toshiba.co.jp>

applied