[libata] Remove ->irq_ack() hook, and ata_dummy_irq_on()

* ->irq_ack() is redundant to what the irq handler already
  performs... chk-status + irq-clear.  Furthermore, it is only
  called in one place, when screaming-irq-debugging is enabled,
  so we don't want to bother with a hook just for that.

* ata_dummy_irq_on() is only ever used in drivers that have
  no callpath reaching ->irq_on().  Remove .irq_on hook from
  those drivers, and the now-unused ata_dummy_irq_on()

Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 0 insertions, 1 deletions

diff --git a/drivers/ata/sata_qstor.c b/drivers/ata/sata_qstor.c
index ef1ad69c26ed..5a60ab72ecb6 100644
--- a/drivers/ata/sata_qstor.c
+++ b/drivers/ata/sata_qstor.c
@@ -159,7 +159,6 @@ static const struct ata_port_operations qs_ata_ops = {
         .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,