libata: implement and use ata_noop_irq_clear()

->irq_clear() is used to clear IRQ bit of a SFF controller and isn't
useful for drivers which don't use libata SFF HSM implementation.
However, it's a required callback and many drivers implement their own
noop version as placeholder.  This patch implements ata_noop_irq_clear
and use it to replace those custom placeholders.

Also, SFF drivers which don't support BMDMA don't need to use
ata_bmdma_irq_clear().  It becomes noop if BMDMA address isn't
initialized.  Convert them to use ata_noop_irq_clear().

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 1 insertions, 7 deletions

diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index ba0c00e8ee7f..b85464d51f68 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -348,7 +348,6 @@ static void sil24_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
 static int sil24_qc_defer(struct ata_queued_cmd *qc);
 static void sil24_qc_prep(struct ata_queued_cmd *qc);
 static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc);
-static void sil24_irq_clear(struct ata_port *ap);
 static void sil24_pmp_attach(struct ata_port *ap);
 static void sil24_pmp_detach(struct ata_port *ap);
 static void sil24_freeze(struct ata_port *ap);
@@ -416,7 +415,7 @@ static const struct ata_port_operations sil24_ops = {
         .qc_prep                = sil24_qc_prep,
         .qc_issue               = sil24_qc_issue,
 
-        .irq_clear              = sil24_irq_clear,
+        .irq_clear              = ata_noop_irq_clear,
 
         .scr_read               = sil24_scr_read,
         .scr_write              = sil24_scr_write,
@@ -921,11 +920,6 @@ static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc)
         return 0;
 }
 
-static void sil24_irq_clear(struct ata_port *ap)
-{
-        /* unused */
-}
-
 static void sil24_pmp_attach(struct ata_port *ap)
 {
         sil24_config_pmp(ap, 1);