tree a249660fdd9f252925eff9eaac3ed7836c839f91
parent c1bc899f5805771926c9198e2ab4d77122c356a1
author Tejun Heo <htejun@gmail.com> 1206415367 +0900
committer Jeff Garzik <jgarzik@redhat.com> 1208461456 -0400

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>