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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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12
drivers/ata/sata_sil.c
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@@ -303,22 +303,20 @@ static int sil_set_mode (struct ata_port *ap, struct ata_device **r_failed)
struct ata_device *dev;
void __iomem *mmio_base = host->iomap[SIL_MMIO_BAR];
void __iomem *addr = mmio_base + sil_port[ap->port_no].xfer_mode;
u32 tmp, dev_mode[2];
unsigned int i;
u32 tmp, dev_mode[2] = { };
int rc;
rc = ata_do_set_mode(ap, r_failed);
if (rc)
return rc;
for (i = 0; i < 2; i++) {
dev = &ap->link.device[i];
ata_link_for_each_dev(dev, &ap->link) {
if (!ata_dev_enabled(dev))
dev_mode[i] = 0; /* PIO0/1/2 */
dev_mode[dev->devno] = 0; /* PIO0/1/2 */
else if (dev->flags & ATA_DFLAG_PIO)
dev_mode[i] = 1; /* PIO3/4 */
dev_mode[dev->devno] = 1; /* PIO3/4 */
else
dev_mode[i] = 3; /* UDMA */
dev_mode[dev->devno] = 3; /* UDMA */
/* value 2 indicates MDMA */
}