.qc_issue               = ahci_qc_issue,
 
        .irq_clear              = ahci_irq_clear,
-       .irq_on                 = ata_dummy_irq_on,
-       .irq_ack                = ata_dummy_irq_ack,
 
        .scr_read               = ahci_scr_read,
        .scr_write              = ahci_scr_write,
        .qc_issue               = ahci_qc_issue,
 
        .irq_clear              = ahci_irq_clear,
-       .irq_on                 = ata_dummy_irq_on,
-       .irq_ack                = ata_dummy_irq_ack,
 
        .scr_read               = ahci_scr_read,
        .scr_write              = ahci_scr_write,
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
 
 #ifdef ATA_IRQ_TRAP
        if ((ap->stats.idle_irq % 1000) == 0) {
-               ap->ops->irq_ack(ap, 0); /* debug trap */
+               ata_chk_status(ap);
+               ap->ops->irq_clear(ap);
                ata_port_printk(ap, KERN_WARNING, "irq trap\n");
                return 1;
        }
 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
 EXPORT_SYMBOL_GPL(ata_do_eh);
 EXPORT_SYMBOL_GPL(ata_irq_on);
-EXPORT_SYMBOL_GPL(ata_dummy_irq_on);
-EXPORT_SYMBOL_GPL(ata_irq_ack);
-EXPORT_SYMBOL_GPL(ata_dummy_irq_ack);
 EXPORT_SYMBOL_GPL(ata_dev_try_classify);
 
 EXPORT_SYMBOL_GPL(ata_cable_40wire);
 
        return tmp;
 }
 
-u8 ata_dummy_irq_on (struct ata_port *ap)      { return 0; }
-
-/**
- *     ata_irq_ack - Acknowledge a device interrupt.
- *     @ap: Port on which interrupts are enabled.
- *
- *     Wait up to 10 ms for legacy IDE device to become idle (BUSY
- *     or BUSY+DRQ clear).  Obtain dma status and port status from
- *     device.  Clear the interrupt.  Return port status.
- *
- *     LOCKING:
- */
-
-u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq)
-{
-       unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
-       u8 host_stat = 0, post_stat = 0, status;
-
-       status = ata_busy_wait(ap, bits, 1000);
-       if (status & bits)
-               if (ata_msg_err(ap))
-                       printk(KERN_ERR "abnormal status 0x%X\n", status);
-
-       if (ap->ioaddr.bmdma_addr) {
-               /* get controller status; clear intr, err bits */
-               host_stat = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
-               iowrite8(host_stat | ATA_DMA_INTR | ATA_DMA_ERR,
-                        ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
-
-               post_stat = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
-       }
-       if (ata_msg_intr(ap))
-               printk(KERN_INFO "%s: irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
-                       __FUNCTION__,
-                       host_stat, post_stat, status);
-       return status;
-}
-
-u8 ata_dummy_irq_ack(struct ata_port *ap, unsigned int chk_drq) { return 0; }
-
 /**
  *     ata_tf_load - send taskfile registers to host controller
  *     @ap: Port to which output is sent
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = cmd640_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
 
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
                           pata_icside_postreset);
 }
 
-static u8 pata_icside_irq_ack(struct ata_port *ap, unsigned int chk_drq)
-{
-       unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
-       u8 status;
-
-       status = ata_busy_wait(ap, bits, 1000);
-       if (status & bits)
-               if (ata_msg_err(ap))
-                       printk(KERN_ERR "abnormal status 0x%X\n", status);
-
-       if (ata_msg_intr(ap))
-               printk(KERN_INFO "%s: irq ack: drv_stat 0x%X\n",
-                       __FUNCTION__, status);
-
-       return status;
-}
-
 static struct ata_port_operations pata_icside_port_ops = {
        .port_disable           = ata_port_disable,
 
 
        .irq_clear              = ata_dummy_noret,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = pata_icside_irq_ack,
 
        .port_start             = pata_icside_port_start,
 
 
 
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = it821x_port_start,
 };
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_handler    = ata_interrupt,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = it821x_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_dummy_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        /* Generic PATA PCI ATA helpers */
        .port_start             = ata_port_start,
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        /* Generic PATA PCI ATA helpers */
        .port_start             = ata_port_start,
 
        .data_xfer              = ata_data_xfer,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .port_start             = ata_port_start,
 };
 
 
 
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        /* Generic PATA PCI ATA helpers */
        .port_start             = ata_port_start,
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
 
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_sff_port_start,
 };
 
 
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
 
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_dummy_ret0,
 };
 
 
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        return tmp;
 }
 
-/**
- *     scc_irq_ack - Acknowledge a device interrupt.
- *     @ap: Port on which interrupts are enabled.
- *
- *     Note: Original code is ata_irq_ack().
- */
-
-static u8 scc_irq_ack (struct ata_port *ap, unsigned int chk_drq)
-{
-       unsigned int bits = chk_drq ? ATA_BUSY | ATA_DRQ : ATA_BUSY;
-       u8 host_stat, post_stat, status;
-
-       status = ata_busy_wait(ap, bits, 1000);
-       if (status & bits)
-               if (ata_msg_err(ap))
-                       printk(KERN_ERR "abnormal status 0x%X\n", status);
-
-       /* get controller status; clear intr, err bits */
-       host_stat = in_be32(ap->ioaddr.bmdma_addr + SCC_DMA_STATUS);
-       out_be32(ap->ioaddr.bmdma_addr + SCC_DMA_STATUS,
-                host_stat | ATA_DMA_INTR | ATA_DMA_ERR);
-
-       post_stat = in_be32(ap->ioaddr.bmdma_addr + SCC_DMA_STATUS);
-
-       if (ata_msg_intr(ap))
-               printk(KERN_INFO "%s: irq ack: host_stat 0x%X, new host_stat 0x%X, drv_stat 0x%X\n",
-                      __FUNCTION__,
-                      host_stat, post_stat, status);
-
-       return status;
-}
-
 /**
  *     scc_bmdma_freeze - Freeze BMDMA controller port
  *     @ap: port to freeze
 
        .irq_clear              = scc_bmdma_irq_clear,
        .irq_on                 = scc_irq_on,
-       .irq_ack                = scc_irq_ack,
 
        .port_start             = scc_port_start,
        .port_stop              = scc_port_stop,
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
        .irq_handler            = ata_interrupt,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
        .irq_handler    = ata_interrupt,
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
 
        .irq_clear      = ata_bmdma_irq_clear,
        .irq_on         = ata_irq_on,
-       .irq_ack        = ata_irq_ack,
 
        .port_start     = ata_port_start,
 };
 
        .error_handler          = adma_error_handler,
        .irq_clear              = adma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .port_start             = adma_port_start,
        .port_stop              = adma_port_stop,
        .host_stop              = adma_host_stop,
 
 
        .irq_clear              = inic_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .qc_prep                = ata_qc_prep,
        .qc_issue               = inic_qc_issue,
 
 
        .irq_clear              = mv_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .error_handler          = mv_error_handler,
        .post_internal_cmd      = mv_post_int_cmd,
 
        .irq_clear              = mv_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .error_handler          = mv_error_handler,
        .post_internal_cmd      = mv_post_int_cmd,
 
        .irq_clear              = mv_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .error_handler          = mv_error_handler,
        .post_internal_cmd      = mv_post_int_cmd,
 
        .data_xfer              = ata_data_xfer,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .scr_read               = nv_scr_read,
        .scr_write              = nv_scr_write,
        .port_start             = ata_port_start,
        .data_xfer              = ata_data_xfer,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .scr_read               = nv_scr_read,
        .scr_write              = nv_scr_write,
        .port_start             = ata_port_start,
        .data_xfer              = ata_data_xfer,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .scr_read               = nv_scr_read,
        .scr_write              = nv_scr_write,
        .port_start             = ata_port_start,
        .data_xfer              = ata_data_xfer,
        .irq_clear              = nv_adma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .scr_read               = nv_scr_read,
        .scr_write              = nv_scr_write,
        .port_start             = nv_adma_port_start,
 
        .data_xfer              = ata_data_xfer,
        .irq_clear              = pdc_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .scr_read               = pdc_sata_scr_read,
        .scr_write              = pdc_sata_scr_write,
        .data_xfer              = ata_data_xfer,
        .irq_clear              = pdc_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .scr_read               = pdc_sata_scr_read,
        .scr_write              = pdc_sata_scr_write,
        .data_xfer              = ata_data_xfer,
        .irq_clear              = pdc_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = pdc_common_port_start,
 };
 
        .eng_timeout            = qs_eng_timeout,
        .irq_clear              = qs_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .scr_read               = qs_scr_read,
        .scr_write              = qs_scr_write,
        .port_start             = qs_port_start,
 
        .post_internal_cmd      = ata_bmdma_post_internal_cmd,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .scr_read               = sil_scr_read,
        .scr_write              = sil_scr_write,
        .port_start             = ata_port_start,
 
        .qc_issue               = sil24_qc_issue,
 
        .irq_clear              = sil24_irq_clear,
-       .irq_on                 = ata_dummy_irq_on,
-       .irq_ack                = ata_dummy_irq_ack,
 
        .scr_read               = sil24_scr_read,
        .scr_write              = sil24_scr_write,
 
        .post_internal_cmd      = ata_bmdma_post_internal_cmd,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .scr_read               = sis_scr_read,
        .scr_write              = sis_scr_write,
        .port_start             = ata_port_start,
 
        .post_internal_cmd      = ata_bmdma_post_internal_cmd,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .scr_read               = k2_sata_scr_read,
        .scr_write              = k2_sata_scr_write,
        .port_start             = ata_port_start,
 
        .eng_timeout            = pdc_eng_timeout,
        .irq_clear              = pdc20621_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .port_start             = pdc_port_start,
 };
 
 
 
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .scr_read               = uli_scr_read,
        .scr_write              = uli_scr_write,
 
 
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .port_start             = ata_port_start,
 };
 
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
 
        .scr_read               = svia_scr_read,
        .scr_write              = svia_scr_write,
 
        .post_internal_cmd      = ata_bmdma_post_internal_cmd,
        .irq_clear              = ata_bmdma_irq_clear,
        .irq_on                 = ata_irq_on,
-       .irq_ack                = ata_irq_ack,
        .scr_read               = vsc_sata_scr_read,
        .scr_write              = vsc_sata_scr_write,
        .port_start             = ata_port_start,
 
        irq_handler_t irq_handler;
        void (*irq_clear) (struct ata_port *);
        u8 (*irq_on) (struct ata_port *);
-       u8 (*irq_ack) (struct ata_port *ap, unsigned int chk_drq);
 
        int (*scr_read) (struct ata_port *ap, unsigned int sc_reg, u32 *val);
        int (*scr_write) (struct ata_port *ap, unsigned int sc_reg, u32 val);
 extern struct ata_device *ata_dev_pair(struct ata_device *adev);
 extern int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev);
 extern u8 ata_irq_on(struct ata_port *ap);
-extern u8 ata_dummy_irq_on(struct ata_port *ap);
-extern u8 ata_irq_ack(struct ata_port *ap, unsigned int chk_drq);
-extern u8 ata_dummy_irq_ack(struct ata_port *ap, unsigned int chk_drq);
 
 extern int ata_cable_40wire(struct ata_port *ap);
 extern int ata_cable_80wire(struct ata_port *ap);