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ACPI: pci_link: simplify list of link devices 

We don't need a struct containing a count and a list_head; a simple
list_head is sufficient.  The list iterators handle empty lists
fine.

Furthermore, we don't need to check for null list entries because we
only add non-null entries.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bjorn Helgaas 2009-02-17 14:00:55 -07:00 committed by Len Brown
parent 6eca4b4ca1
commit 5f0dccaa81
1 changed files with 6 additions and 26 deletions
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32
drivers/acpi/pci_link.c
View File

@ -86,16 +86,13 @@ struct acpi_pci_link_irq {
};
struct acpi_pci_link {
struct list_head node;
struct list_head list;
struct acpi_device *device;
struct acpi_pci_link_irq irq;
int refcnt;
};
static struct {
int count;
struct list_head entries;
} acpi_link;
static LIST_HEAD(acpi_link_list);
static DEFINE_MUTEX(acpi_link_lock);
/* --------------------------------------------------------------------------
@ -479,19 +476,13 @@ static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
int __init acpi_irq_penalty_init(void)
{
struct list_head *node;
struct acpi_pci_link *link;
int i;
/*
* Update penalties to facilitate IRQ balancing.
*/
list_for_each(node, &acpi_link.entries) {
link = list_entry(node, struct acpi_pci_link, node);
if (!link) {
printk(KERN_ERR PREFIX "Invalid link context\n");
continue;
}
list_for_each_entry(link, &acpi_link_list, list) {
/*
* reflect the possible and active irqs in the penalty table --
@ -743,9 +734,7 @@ static int acpi_pci_link_add(struct acpi_device *device)
printk("\n");
/* TBD: Acquire/release lock */
list_add_tail(&link->node, &acpi_link.entries);
acpi_link.count++;
list_add_tail(&link->list, &acpi_link_list);
end:
/* disable all links -- to be activated on use */
@ -768,15 +757,9 @@ static int acpi_pci_link_resume(struct acpi_pci_link *link)
static int irqrouter_resume(struct sys_device *dev)
{
struct list_head *node;
struct acpi_pci_link *link;
list_for_each(node, &acpi_link.entries) {
link = list_entry(node, struct acpi_pci_link, node);
if (!link) {
printk(KERN_ERR PREFIX "Invalid link context\n");
continue;
}
list_for_each_entry(link, &acpi_link_list, list) {
acpi_pci_link_resume(link);
}
return 0;
@ -789,7 +772,7 @@ static int acpi_pci_link_remove(struct acpi_device *device, int type)
link = acpi_driver_data(device);
mutex_lock(&acpi_link_lock);
list_del(&link->node);
list_del(&link->list);
mutex_unlock(&acpi_link_lock);
kfree(link);
@ -926,9 +909,6 @@ static int __init acpi_pci_link_init(void)
acpi_irq_balance = 0;
}
acpi_link.count = 0;
INIT_LIST_HEAD(&acpi_link.entries);
if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
return -ENODEV;