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| author |   Tejun Heo <htejun@gmail.com> | 2007-08-06 18:36:23 +0900 |
|---|---|---|
| committer |   Jeff Garzik <jeff@garzik.org> | 2007-10-12 14:55:30 -0400 |
| commit | f58229f8060055b08b34008ea08f31de1e2f003c (patch) | |
| tree | 6ca5ef546671cb975ef3632fb032c238eaf1bb4c /include/linux/libata.h | |
| parent | libata-link: introduce ata_link (diff) | |
| download | linux-dev-f58229f8060055b08b34008ea08f31de1e2f003c.tar.xz linux-dev-f58229f8060055b08b34008ea08f31de1e2f003c.zip | |
libata-link: implement and use link/device iterators
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>
Diffstat (limited to 'include/linux/libata.h')
| -rw-r--r-- | include/linux/libata.h | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h index ca4493125fa0..62fa8cf677a1 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -1030,15 +1030,26 @@ static inline unsigned int ata_dev_absent(const struct ata_device *dev) } /* - * port helpers + * link helpers */ -static inline int ata_port_max_devices(const struct ata_port *ap) +static inline int ata_link_max_devices(const struct ata_link *link) { - if (ap->flags & ATA_FLAG_SLAVE_POSS) + if (link->ap->flags & ATA_FLAG_SLAVE_POSS) return 2; return 1; } +#define ata_port_for_each_link(lk, ap) \ + for ((lk) = &(ap)->link; (lk); (lk) = NULL) + +#define ata_link_for_each_dev(dev, link) \ + for ((dev) = (link)->device; \ + (dev) < (link)->device + ata_link_max_devices(link) || ((dev) = NULL); \ + (dev)++) + +#define ata_link_for_each_dev_reverse(dev, link) \ + for ((dev) = (link)->device + ata_link_max_devices(link) - 1; \ + (dev) >= (link)->device || ((dev) = NULL); (dev)--) static inline u8 ata_chk_status(struct ata_port *ap) { |