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libata: reimplement link iterator

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Implement __ata_port_next_link() and reimplement
__ata_port_for_each_link() and ata_port_for_each_link() using it.
This removes relatively large inlined code and makes iteration easier
to extend.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2008-07-31 17:02:41 +09:00 committed by Jeff Garzik
parent 82ef04fb4c
commit aadffb682c
2 changed files with 38 additions and 25 deletions
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30
drivers/ata/libata-core.c
View file

@ -163,6 +163,35 @@ MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
/*
* Iterator helpers. Don't use directly.
*
* LOCKING:
* Host lock or EH context.
*/
struct ata_link *__ata_port_next_link(struct ata_port *ap,
struct ata_link *link, bool dev_only)
{
/* NULL link indicates start of iteration */
if (!link) {
if (dev_only && sata_pmp_attached(ap))
return ap->pmp_link;
return &ap->link;
}
/* we just iterated over the host link, what's next? */
if (ata_is_host_link(link)) {
if (!sata_pmp_attached(ap))
return NULL;
return ap->pmp_link;
}
/* iterate to the next PMP link */
if (++link < ap->pmp_link + ap->nr_pmp_links)
return link;
return NULL;
}
/**
* ata_force_cbl - force cable type according to libata.force
* @ap: ATA port of interest
@ -6255,6 +6284,7 @@ EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
EXPORT_SYMBOL_GPL(__ata_port_next_link);
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_host_init);
EXPORT_SYMBOL_GPL(ata_host_alloc);

33
include/linux/libata.h
View file

@ -1265,34 +1265,17 @@ static inline int ata_link_active(struct ata_link *link)
return ata_tag_valid(link->active_tag) || link->sactive;
}
static inline struct ata_link *ata_port_first_link(struct ata_port *ap)
{
if (sata_pmp_attached(ap))
return ap->pmp_link;
return &ap->link;
}
extern struct ata_link *__ata_port_next_link(struct ata_port *ap,
struct ata_link *link,
bool dev_only);
static inline struct ata_link *ata_port_next_link(struct ata_link *link)
{
struct ata_port *ap = link->ap;
if (ata_is_host_link(link)) {
if (!sata_pmp_attached(ap))
return NULL;
return ap->pmp_link;
}
if (++link < ap->nr_pmp_links + ap->pmp_link)
return link;
return NULL;
}
#define __ata_port_for_each_link(lk, ap) \
for ((lk) = &(ap)->link; (lk); (lk) = ata_port_next_link(lk))
#define __ata_port_for_each_link(link, ap) \
for ((link) = __ata_port_next_link((ap), NULL, false); (link); \
(link) = __ata_port_next_link((ap), (link), false))
#define ata_port_for_each_link(link, ap) \
for ((link) = ata_port_first_link(ap); (link); \
(link) = ata_port_next_link(link))
for ((link) = __ata_port_next_link((ap), NULL, true); (link); \
(link) = __ata_port_next_link((ap), (link), true))
#define ata_link_for_each_dev(dev, link) \
for ((dev) = (link)->device; \