Now the acpiphp driver has been converted as builtin, so introduce
a kernel boot option "acpiphp.disable" to disable the acpiphp driver
on boot.
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 3 +++
drivers/pci/hotplug/acpiphp.h | 1 +
drivers/pci/hotplug/acpiphp_core.c | 6 +++++-
drivers/pci/hotplug/acpiphp_glue.c | 6 ++++++
4 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4609e81..38baa0d 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -290,6 +290,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
no: ACPI OperationRegions are not marked as reserved,
no further checks are performed.
+ acpiphp.disable
+ Disable the PCI acpiphp hotplug driver.
+
add_efi_memmap [EFI; X86] Include EFI memory map in
kernel's map of available physical RAM.
diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h
index 7577bb3..6a319f4 100644
--- a/drivers/pci/hotplug/acpiphp.h
+++ b/drivers/pci/hotplug/acpiphp.h
@@ -188,5 +188,6 @@ 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 80d777c..cdbd983 100644
--- a/drivers/pci/hotplug/acpiphp_core.c
+++ b/drivers/pci/hotplug/acpiphp_core.c
@@ -49,6 +49,7 @@
#define SLOT_NAME_SIZE 21 /* {_SUN} */
bool acpiphp_debug;
+bool acpiphp_disabled;
/* local variables */
static struct acpiphp_attention_info *attention_info;
@@ -61,7 +62,9 @@ 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);
@@ -354,5 +357,6 @@ void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
void __init acpiphp_init(void)
{
- info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
+ info(DRIVER_DESC " version: " DRIVER_VERSION "%s\n",
+ acpiphp_disabled ? ", disabled by user" : "");
}
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 896d680..96fed19 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -1139,6 +1139,9 @@ void acpiphp_enumerate_slots(struct pci_bus *bus, acpi_handle handle)
acpi_handle dummy_handle;
struct acpiphp_bridge *bridge;
+ if (acpiphp_disabled)
+ return;
+
if (detect_ejectable_slots(handle) <= 0)
return;
@@ -1177,6 +1180,9 @@ void acpiphp_remove_slots(struct pci_bus *bus)
{
struct acpiphp_bridge *bridge, *tmp;
+ if (acpiphp_disabled)
+ return;
+
list_for_each_entry_safe(bridge, tmp, &bridge_list, list)
if (bridge->pci_bus == bus) {
cleanup_bridge(bridge);
--
1.7.9.5
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