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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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26
drivers/ata/libata-scsi.c
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@@ -2425,7 +2425,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
static struct ata_device * ata_find_dev(struct ata_port *ap, int id)
{
if (likely(id < ATA_MAX_DEVICES))
if (likely(id < ata_link_max_devices(&ap->link)))
return &ap->link.device[id];
return NULL;
}
@@ -2952,21 +2952,18 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)
int tries = 5;
struct ata_device *last_failed_dev = NULL;
struct ata_device *dev;
unsigned int i;
if (ap->flags & ATA_FLAG_DISABLED)
return;
repeat:
for (i = 0; i < ATA_MAX_DEVICES; i++) {
ata_link_for_each_dev(dev, &ap->link) {
struct scsi_device *sdev;
dev = &ap->link.device[i];
if (!ata_dev_enabled(dev) || dev->sdev)
continue;
sdev = __scsi_add_device(ap->scsi_host, 0, i, 0, NULL);
sdev = __scsi_add_device(ap->scsi_host, 0, dev->devno, 0, NULL);
if (!IS_ERR(sdev)) {
dev->sdev = sdev;
scsi_device_put(sdev);
@@ -2977,12 +2974,11 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)
* failure occurred, scan would have failed silently. Check
* whether all devices are attached.
*/
for (i = 0; i < ATA_MAX_DEVICES; i++) {
dev = &ap->link.device[i];
ata_link_for_each_dev(dev, &ap->link) {
if (ata_dev_enabled(dev) && !dev->sdev)
break;
}
if (i == ATA_MAX_DEVICES)
if (!dev)
return;
/* we're missing some SCSI devices */
@@ -3112,7 +3108,7 @@ void ata_scsi_hotplug(struct work_struct *work)
{
struct ata_port *ap =
container_of(work, struct ata_port, hotplug_task.work);
int i;
struct ata_device *dev;
if (ap->pflags & ATA_PFLAG_UNLOADING) {
DPRINTK("ENTER/EXIT - unloading\n");
@@ -3122,8 +3118,7 @@ void ata_scsi_hotplug(struct work_struct *work)
DPRINTK("ENTER\n");
/* unplug detached devices */
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->link.device[i];
ata_link_for_each_dev(dev, &ap->link) {
unsigned long flags;
if (!(dev->flags & ATA_DFLAG_DETACHED))
@@ -3176,7 +3171,7 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
spin_lock_irqsave(ap->lock, flags);
if (id == SCAN_WILD_CARD) {
ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
ehi->probe_mask |= (1 << ata_link_max_devices(&ap->link)) - 1;
ehi->action |= ATA_EH_SOFTRESET;
} else {
struct ata_device *dev = ata_find_dev(ap, id);
@@ -3215,13 +3210,12 @@ void ata_scsi_dev_rescan(struct work_struct *work)
{
struct ata_port *ap =
container_of(work, struct ata_port, scsi_rescan_task);
struct ata_device *dev;
unsigned long flags;
unsigned int i;
spin_lock_irqsave(ap->lock, flags);
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->link.device[i];
ata_link_for_each_dev(dev, &ap->link) {
struct scsi_device *sdev = dev->sdev;
if (!ata_dev_enabled(dev) || !sdev)