libata: beef up iterators
There currently are the following looping constructs.
* __ata_port_for_each_link() for all available links
* ata_port_for_each_link() for edge links
* ata_link_for_each_dev() for all devices
* ata_link_for_each_dev_reverse() for all devices in reverse order
Now there's a need for looping construct which is similar to
__ata_port_for_each_link() but iterates over PMP links before the host
link. Instead of adding another one with long name, do the following
cleanup.
* Implement and export ata_link_next() and ata_dev_next() which take
@mode parameter and can be used to build custom loop.
* Implement ata_for_each_link() and ata_for_each_dev() which take
looping mode explicitly.
The following iteration modes are implemented.
* ATA_LITER_EDGE : loop over edge links
* ATA_LITER_HOST_FIRST : loop over all links, host link first
* ATA_LITER_PMP_FIRST : loop over all links, PMP links first
* ATA_DITER_ENABLED : loop over enabled devices
* ATA_DITER_ENABLED_REVERSE : loop over enabled devices in reverse order
* ATA_DITER_ALL : loop over all devices
* ATA_DITER_ALL_REVERSE : loop over all devices in reverse order
This change removes exlicit device enabledness checks from many loops
and makes it clear which ones are iterated over in which direction.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 47c7afc..0b2e14f 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3229,12 +3229,12 @@
return;
repeat:
- ata_port_for_each_link(link, ap) {
- ata_link_for_each_dev(dev, link) {
+ ata_for_each_link(link, ap, EDGE) {
+ ata_for_each_dev(dev, link, ENABLED) {
struct scsi_device *sdev;
int channel = 0, id = 0;
- if (!ata_dev_enabled(dev) || dev->sdev)
+ if (dev->sdev)
continue;
if (ata_is_host_link(link))
@@ -3255,9 +3255,9 @@
* failure occurred, scan would have failed silently. Check
* whether all devices are attached.
*/
- ata_port_for_each_link(link, ap) {
- ata_link_for_each_dev(dev, link) {
- if (ata_dev_enabled(dev) && !dev->sdev)
+ ata_for_each_link(link, ap, EDGE) {
+ ata_for_each_dev(dev, link, ENABLED) {
+ if (!dev->sdev)
goto exit_loop;
}
}
@@ -3381,7 +3381,7 @@
struct ata_port *ap = link->ap;
struct ata_device *dev;
- ata_link_for_each_dev(dev, link) {
+ ata_for_each_dev(dev, link, ALL) {
unsigned long flags;
if (!(dev->flags & ATA_DFLAG_DETACHED))
@@ -3496,7 +3496,7 @@
if (devno == SCAN_WILD_CARD) {
struct ata_link *link;
- ata_port_for_each_link(link, ap) {
+ ata_for_each_link(link, ap, EDGE) {
struct ata_eh_info *ehi = &link->eh_info;
ehi->probe_mask |= ATA_ALL_DEVICES;
ehi->action |= ATA_EH_RESET;
@@ -3544,11 +3544,11 @@
spin_lock_irqsave(ap->lock, flags);
- ata_port_for_each_link(link, ap) {
- ata_link_for_each_dev(dev, link) {
+ ata_for_each_link(link, ap, EDGE) {
+ ata_for_each_dev(dev, link, ENABLED) {
struct scsi_device *sdev = dev->sdev;
- if (!ata_dev_enabled(dev) || !sdev)
+ if (!sdev)
continue;
if (scsi_device_get(sdev))
continue;