ACPI: Use syscore_ops instead of sysdev class and sysdev

ACPI uses a sysdev class and a sysdev for executing
irqrouter_resume() before turning on interrupts on the boot CPU.
However, since irqrouter_resume() ignores its argument, the entire
mechanism may be replaced with a struct syscore_ops object which
is considerably simpler.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 8 insertions, 22 deletions

diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index 9ff80a7e9f6a..4a29763b8eb4 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -29,7 +29,7 @@
  *         for IRQ management (e.g. start()->_SRS).
  */
 
-#include <linux/sysdev.h>
+#include <linux/syscore_ops.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -757,14 +757,13 @@ static int acpi_pci_link_resume(struct acpi_pci_link *link)
         return 0;
 }
 
-static int irqrouter_resume(struct sys_device *dev)
+static void irqrouter_resume(void)
 {
         struct acpi_pci_link *link;
 
         list_for_each_entry(link, &acpi_link_list, list) {
                 acpi_pci_link_resume(link);
         }
-        return 0;
 }
 
 static int acpi_pci_link_remove(struct acpi_device *device, int type)
@@ -871,32 +870,19 @@ static int __init acpi_irq_balance_set(char *str)
 
 __setup("acpi_irq_balance", acpi_irq_balance_set);
 
-/* FIXME: we will remove this interface after all drivers call pci_disable_device */
-static struct sysdev_class irqrouter_sysdev_class = {
-        .name = "irqrouter",
+static struct syscore_ops irqrouter_syscore_ops = {
         .resume = irqrouter_resume,
 };
 
-static struct sys_device device_irqrouter = {
-        .id = 0,
-        .cls = &irqrouter_sysdev_class,
-};
-
-static int __init irqrouter_init_sysfs(void)
+static int __init irqrouter_init_ops(void)
 {
-        int error;
+        if (!acpi_disabled && !acpi_noirq)
+                register_syscore_ops(&irqrouter_syscore_ops);
 
-        if (acpi_disabled || acpi_noirq)
-                return 0;
-
-        error = sysdev_class_register(&irqrouter_sysdev_class);
-        if (!error)
-                error = sysdev_register(&device_irqrouter);
-
-        return error;
+        return 0;
 }
 
-device_initcall(irqrouter_init_sysfs);
+device_initcall(irqrouter_init_ops);
 
 static int __init acpi_pci_link_init(void)
 {