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x86/ioapic.c: simplify add_pin_to_irq_node()

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Rather than duplicating the same alloc/init code twice, restructure
the function to look for duplicates and then add an entry
if none is found.

This function is not performance critical; all but one of its callers
are __init functions, and the non-__init caller is for PCI device setup.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge 2009-06-08 03:24:11 -07:00
parent d8c52063ed
commit 875e68ec32
1 changed files with 8 additions and 20 deletions
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28
arch/x86/kernel/apic/io_apic.c
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@ -490,34 +490,22 @@ static void ioapic_mask_entry(int apic, int pin)
*/
static void add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
{
struct irq_pin_list *entry;
struct irq_pin_list **entryp, *entry;
entry = cfg->irq_2_pin;
if (!entry) {
entry = get_one_free_irq_2_pin(node);
if (!entry) {
printk(KERN_ERR "can not alloc irq_2_pin to add %d - %d\n",
apic, pin);
return;
}
cfg->irq_2_pin = entry;
entry->apic = apic;
entry->pin = pin;
return;
}
while (entry->next) {
for (entryp = &cfg->irq_2_pin;
*entryp != NULL;
entryp = &(*entryp)->next) {
entry = *entryp;
/* not again, please */
if (entry->apic == apic && entry->pin == pin)
return;
entry = entry->next;
}
entry->next = get_one_free_irq_2_pin(node);
entry = entry->next;
entry = get_one_free_irq_2_pin(node);
entry->apic = apic;
entry->pin = pin;
*entryp = entry;
}
/*