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libata-link: implement and use link/device iterators

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Multiple links and different number of devices per link should be
considered to iterate over links and devices.  This patch implements
and uses link and device iterators - ata_port_for_each_link() and
ata_link_for_each_dev() - and ata_link_max_devices().

This change makes a lot of functions iterate over only possible
devices instead of from dev 0 to dev ATA_MAX_DEVICES.  All such
changes have been examined and nothing should be broken.

While at it, add a separating comment before device helpers to
distinguish them better from link helpers and others.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2007-08-06 18:36:23 +09:00
committed by Jeff Garzik
parent 9af5c9c97d
commit f58229f806
13 changed files with 134 additions and 148 deletions
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5
drivers/ata/pata_it821x.c
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@ -461,10 +461,9 @@ static unsigned int it821x_passthru_qc_issue_prot(struct ata_queued_cmd *qc)
static int it821x_smart_set_mode(struct ata_port *ap, struct ata_device **unused)
{
int i;
struct ata_device *dev;
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->link.device[i];
ata_link_for_each_dev(dev, &ap->link) {
if (ata_dev_enabled(dev)) {
/* We don't really care */
dev->pio_mode = XFER_PIO_0;