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ide: fix IDE port slots reservation and freeing (take 2)

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* Make ide_find_port_slot() return port slot index.

* Add ide_free_port_slot() helper.

* Move ide_init_port_data() call and error printk() from
  ide_find_port_slot() to ide_host_alloc_all().

* Make ide_{find,free}_port_slot() take ide_cfg_mtx mutex
  and convert them use ide_indexes bitmap to keep track of
  reserved port slots.

* Don't set hwif->chipset in ide_host_alloc_all() as it is
  no longer necessary.

v2:
* Pass the correct slot index to ide_init_port_data().

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-07-23 19:55:57 +02:00
parent e0d0020788
commit 8cdf310025
1 changed files with 50 additions and 37 deletions
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87
drivers/ide/ide-probe.c
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@ -1470,18 +1470,20 @@ static int ide_sysfs_register_port(ide_hwif_t *hwif)
return rc;
}
static unsigned int ide_indexes;
/**
* ide_find_port_slot - find free ide_hwifs[] slot
* ide_find_port_slot - find free port slot
* @d: IDE port info
*
* Return the new hwif. If we are out of free slots return NULL.
* Return the new port slot index or -ENOENT if we are out of free slots.
*/
static ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
static int ide_find_port_slot(const struct ide_port_info *d)
{
ide_hwif_t *hwif;
int i;
int idx = -ENOENT;
u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
/*
* Claim an unassigned slot.
@ -1493,35 +1495,33 @@ static ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
* Unless there is a bootable card that does not use the standard
* ports 0x1f0/0x170 (the ide0/ide1 defaults).
*/
if (bootable) {
i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
for (; i < MAX_HWIFS; i++) {
hwif = &ide_hwifs[i];
if (hwif->chipset == ide_unknown)
goto out_found;
}
mutex_lock(&ide_cfg_mtx);
if (MAX_HWIFS == 1) {
if (ide_indexes == 0 && i == 0)
idx = 1;
} else {
for (i = 2; i < MAX_HWIFS; i++) {
hwif = &ide_hwifs[i];
if (hwif->chipset == ide_unknown)
goto out_found;
}
for (i = 0; i < 2 && i < MAX_HWIFS; i++) {
hwif = &ide_hwifs[i];
if (hwif->chipset == ide_unknown)
goto out_found;
if (bootable) {
if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
idx = ffz(ide_indexes | i);
} else {
if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
idx = ffz(ide_indexes | 3);
else if ((ide_indexes & 3) != 3)
idx = ffz(ide_indexes);
}
}
if (idx >= 0)
ide_indexes |= (1 << idx);
mutex_unlock(&ide_cfg_mtx);
printk(KERN_ERR "%s: no free slot for interface\n",
d ? d->name : "ide");
return idx;
}
return NULL;
out_found:
ide_init_port_data(hwif, i);
return hwif;
static void ide_free_port_slot(int idx)
{
mutex_lock(&ide_cfg_mtx);
ide_indexes &= ~(1 << idx);
mutex_unlock(&ide_cfg_mtx);
}
struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
@ -1536,17 +1536,24 @@ struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
for (i = 0; i < MAX_HWIFS; i++) {
ide_hwif_t *hwif;
int idx;
if (hws[i] == NULL)
continue;
hwif = ide_find_port_slot(d);
if (hwif) {
hwif->chipset = hws[i]->chipset;
host->ports[i] = hwif;
host->n_ports++;
idx = ide_find_port_slot(d);
if (idx < 0) {
printk(KERN_ERR "%s: no free slot for interface\n",
d ? d->name : "ide");
continue;
}
hwif = &ide_hwifs[idx];
ide_init_port_data(hwif, idx);
host->ports[i] = hwif;
host->n_ports++;
}
if (host->n_ports == 0) {
@ -1695,11 +1702,17 @@ EXPORT_SYMBOL_GPL(ide_host_add);
void ide_host_remove(struct ide_host *host)
{
ide_hwif_t *hwif;
int i;
for (i = 0; i < MAX_HWIFS; i++) {
if (host->ports[i])
ide_unregister(host->ports[i]);
hwif = host->ports[i];
if (hwif == NULL)
continue;
ide_unregister(hwif);
ide_free_port_slot(hwif->index);
}
kfree(host);