PCI: acpiphp: Convert acpiphp to be builtin only, not modular

Convert acpiphp to be builtin only, with no module option.

Previously, when HOTPLUG_PCI_ACPI=m, users could disable acpiphp by
removing the module or preventing it from loading.  That can't be done
if acpiphp is builtin statically, so this adds an "acpiphp.disable"
kernel parameter.  If a user needs to use this parameter, it is a bug,
and we want to hear about it.

[bhelgaas: fold in acpiphp.disable here, remove documentation]
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

3 files changed, 10 insertions, 17 deletions

diff --git a/drivers/pci/hotplug/Kconfig b/drivers/pci/hotplug/Kconfig
index 13e9e63a7266..9fcb87f353d4 100644
--- a/drivers/pci/hotplug/Kconfig
+++ b/drivers/pci/hotplug/Kconfig
@@ -52,15 +52,12 @@ config HOTPLUG_PCI_IBM
           When in doubt, say N.
 
 config HOTPLUG_PCI_ACPI
-        tristate "ACPI PCI Hotplug driver"
-        depends on (!ACPI_DOCK && ACPI) || (ACPI_DOCK)
+        bool "ACPI PCI Hotplug driver"
+        depends on HOTPLUG_PCI=y && ((!ACPI_DOCK && ACPI) || (ACPI_DOCK))
         help
           Say Y here if you have a system that supports PCI Hotplug using
           ACPI.
 
-          To compile this driver as a module, choose M here: the
-          module will be called acpiphp.
-
           When in doubt, say N.
 
 config HOTPLUG_PCI_ACPI_IBM
diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h
index 1b311f9db82d..b06ae681d5b7 100644
--- a/drivers/pci/hotplug/acpiphp.h
+++ b/drivers/pci/hotplug/acpiphp.h
@@ -190,5 +190,6 @@ extern u8 acpiphp_get_adapter_status (struct acpiphp_slot *slot);
 
 /* variables */
 extern bool acpiphp_debug;
+extern bool acpiphp_disabled;
 
 #endif /* _ACPIPHP_H */
diff --git a/drivers/pci/hotplug/acpiphp_core.c b/drivers/pci/hotplug/acpiphp_core.c
index c2fd3095701f..81adbfa4df1b 100644
--- a/drivers/pci/hotplug/acpiphp_core.c
+++ b/drivers/pci/hotplug/acpiphp_core.c
@@ -48,6 +48,7 @@
 #define SLOT_NAME_SIZE  21              /* {_SUN} */
 
 bool acpiphp_debug;
+bool acpiphp_disabled;
 
 /* local variables */
 static struct acpiphp_attention_info *attention_info;
@@ -60,7 +61,9 @@ MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
+MODULE_PARM_DESC(disable, "disable acpiphp driver");
 module_param_named(debug, acpiphp_debug, bool, 0644);
+module_param_named(disable, acpiphp_disabled, bool, 0444);
 
 /* export the attention callback registration methods */
 EXPORT_SYMBOL_GPL(acpiphp_register_attention);
@@ -353,9 +356,11 @@ void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
 
 static int __init acpiphp_init(void)
 {
-        info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
+        info(DRIVER_DESC " version: " DRIVER_VERSION "%s\n",
+                acpiphp_disabled ? ", disabled by user; please report a bug"
+                                 : "");
 
-        if (acpi_pci_disabled)
+        if (acpi_pci_disabled || acpiphp_disabled)
                 return 0;
 
         /* read all the ACPI info from the system */
@@ -364,14 +369,4 @@ static int __init acpiphp_init(void)
 }
 
 
-static void __exit acpiphp_exit(void)
-{
-        if (acpi_pci_disabled)
-                return;
-
-        /* deallocate internal data structures etc. */
-        acpiphp_glue_exit();
-}
-
 module_init(acpiphp_init);
-module_exit(acpiphp_exit);