When a PCI bus is removed, all ACPI slots associated with that
bus should be destroyed. Otherwise the ACPI slot device may
cause invalide memory access to the destroyed PCI bus.
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
---
drivers/acpi/pci_slot.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 77 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/pci_slot.c b/drivers/acpi/pci_slot.c
index 323797a..0b67c13 100644
--- a/drivers/acpi/pci_slot.c
+++ b/drivers/acpi/pci_slot.c
@@ -32,6 +32,7 @@
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
+#include <linux/pci-acpi.h>
#include <linux/dmi.h>
static bool debug;
@@ -145,6 +146,21 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
if (device < 0)
return AE_OK;
+ /*
+ * Slots may have already been created for PCI slots under
+ * hot-added PCI host bridges.
+ */
+ mutex_lock(&slot_list_lock);
+ list_for_each_entry(slot, &slot_list, list) {
+ pci_slot = slot->pci_slot;
+ if (pci_slot && pci_slot->bus == pci_bus &&
+ pci_slot->number == device) {
+ mutex_unlock(&slot_list_lock);
+ return AE_OK;
+ }
+ }
+ mutex_unlock(&slot_list_lock);
+
slot = kmalloc(sizeof(*slot), GFP_KERNEL);
if (!slot) {
err("%s: cannot allocate memory\n", __func__);
@@ -354,17 +370,78 @@ static struct dmi_system_id acpi_pci_slot_dmi_table[] __initdata = {
{}
};
+static void acpi_pci_slot_notify_bus_add(struct pci_bus *bus)
+{
+ acpi_handle handle;
+ struct callback_args context;
+
+ /* Skip root buses */
+ if (!bus->self)
+ return;
+
+ context.pci_bus = bus;
+ context.user_function = register_slot;
+ context.root_handle = acpi_find_root_bridge_handle(bus->self);
+ handle = acpi_pci_get_bridge_handle(bus);
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
+ register_slot, NULL, &context, NULL);
+}
+
+static void acpi_pci_slot_notify_bus_remove(struct pci_bus *bus)
+{
+ struct acpi_pci_slot *slot, *tmp;
+
+ /* Skip root buses */
+ if (!bus->self)
+ return;
+
+ mutex_lock(&slot_list_lock);
+ list_for_each_entry_safe(slot, tmp, &slot_list, list) {
+ if (slot->pci_slot && slot->pci_slot->bus == bus) {
+ list_del(&slot->list);
+ pci_destroy_slot(slot->pci_slot);
+ put_device(&bus->dev);
+ kfree(slot);
+ }
+ }
+ mutex_unlock(&slot_list_lock);
+}
+
+static int acpi_pci_slot_notify_fn(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ switch (event) {
+ case PCI_HP_EVENT_BUS_ADD:
+ acpi_pci_slot_notify_bus_add(data);
+ break;
+ case PCI_HP_EVENT_BUS_REMOVE:
+ acpi_pci_slot_notify_bus_remove(data);
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block acpi_pci_slot_notifier = {
+ .notifier_call = &acpi_pci_slot_notify_fn,
+};
+
static int __init
acpi_pci_slot_init(void)
{
dmi_check_system(acpi_pci_slot_dmi_table);
acpi_pci_register_driver(&acpi_pci_slot_driver);
+ pci_register_hotplug_notifier(&acpi_pci_slot_notifier);
+
return 0;
}
static void __exit
acpi_pci_slot_exit(void)
{
+ pci_unregister_hotplug_notifier(&acpi_pci_slot_notifier);
acpi_pci_unregister_driver(&acpi_pci_slot_driver);
}
--
1.7.5.4
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