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ide: factor out code removing port from hwgroup from ide_unregister() 

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-02-01 23:09:35 +01:00
parent 7cba97f129
commit 96e5ad309c
1 changed files with 36 additions and 29 deletions
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65
drivers/ide/ide.c
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@ -461,6 +461,41 @@ static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
hwif->hwif_data = tmp_hwif->hwif_data;
}
static void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
{
ide_hwgroup_t *hwgroup = hwif->hwgroup;
spin_lock_irq(&ide_lock);
/*
* Remove us from the hwgroup, and free
* the hwgroup if we were the only member
*/
if (hwif->next == hwif) {
BUG_ON(hwgroup->hwif != hwif);
kfree(hwgroup);
} else {
/* There is another interface in hwgroup.
* Unlink us, and set hwgroup->drive and ->hwif to
* something sane.
*/
ide_hwif_t *g = hwgroup->hwif;
while (g->next != hwif)
g = g->next;
g->next = hwif->next;
if (hwgroup->hwif == hwif) {
/* Chose a random hwif for hwgroup->hwif.
* It's guaranteed that there are no drives
* left in the hwgroup.
*/
BUG_ON(hwgroup->drive != NULL);
hwgroup->hwif = g;
}
BUG_ON(hwgroup->hwif == hwif);
}
spin_unlock_irq(&ide_lock);
}
/**
* ide_unregister - free an IDE interface
* @index: index of interface (will change soon to a pointer)
@ -528,36 +563,8 @@ void ide_unregister(unsigned int index)
if (irq_count == 1)
free_irq(hwif->irq, hwgroup);
spin_lock_irq(&ide_lock);
/*
* Remove us from the hwgroup, and free
* the hwgroup if we were the only member
*/
if (hwif->next == hwif) {
BUG_ON(hwgroup->hwif != hwif);
kfree(hwgroup);
} else {
/* There is another interface in hwgroup.
* Unlink us, and set hwgroup->drive and ->hwif to
* something sane.
*/
g = hwgroup->hwif;
while (g->next != hwif)
g = g->next;
g->next = hwif->next;
if (hwgroup->hwif == hwif) {
/* Chose a random hwif for hwgroup->hwif.
* It's guaranteed that there are no drives
* left in the hwgroup.
*/
BUG_ON(hwgroup->drive != NULL);
hwgroup->hwif = g;
}
BUG_ON(hwgroup->hwif == hwif);
}
ide_remove_port_from_hwgroup(hwif);
/* More messed up locking ... */
spin_unlock_irq(&ide_lock);
device_unregister(&hwif->gendev);
wait_for_completion(&hwif->gendev_rel_comp);