diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h
index 1592dbe4f904..b6162be4df40 100644
--- a/drivers/pci/hotplug/acpiphp.h
+++ b/drivers/pci/hotplug/acpiphp.h
@@ -77,6 +77,8 @@ struct acpiphp_bridge {
/* PCI-to-PCI bridge device */
struct pci_dev *pci_dev;
+
+ bool is_going_away;
};
@@ -150,6 +152,7 @@ struct acpiphp_attention_info
/* slot flags */
#define SLOT_ENABLED (0x00000001)
+#define SLOT_IS_GOING_AWAY (0x00000002)
/* function flags */
@@ -169,7 +172,7 @@ void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *slot);
typedef int (*acpiphp_callback)(struct acpiphp_slot *slot, void *data);
int acpiphp_enable_slot(struct acpiphp_slot *slot);
-int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
+int acpiphp_disable_slot(struct acpiphp_slot *slot);
u8 acpiphp_get_power_status(struct acpiphp_slot *slot);
u8 acpiphp_get_attention_status(struct acpiphp_slot *slot);
u8 acpiphp_get_latch_status(struct acpiphp_slot *slot);
diff --git a/drivers/pci/hotplug/acpiphp_core.c b/drivers/pci/hotplug/acpiphp_core.c
index dca66bc44578..728c31f4c2c5 100644
--- a/drivers/pci/hotplug/acpiphp_core.c
+++ b/drivers/pci/hotplug/acpiphp_core.c
@@ -156,7 +156,7 @@ static int disable_slot(struct hotplug_slot *hotplug_slot)
pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
/* disable the specified slot */
- return acpiphp_disable_and_eject_slot(slot->acpi_slot);
+ return acpiphp_disable_slot(slot->acpi_slot);
}
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 1cf605f67673..641ba6761bd7 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -430,6 +430,7 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
pr_err("failed to remove notify handler\n");
}
}
+ slot->flags |= SLOT_IS_GOING_AWAY;
if (slot->slot)
acpiphp_unregister_hotplug_slot(slot);
}
@@ -437,6 +438,8 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
mutex_lock(&bridge_mutex);
list_del(&bridge->list);
mutex_unlock(&bridge_mutex);
+
+ bridge->is_going_away = true;
}
/**
@@ -736,6 +739,10 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
{
struct acpiphp_slot *slot;
+ /* Bail out if the bridge is going away. */
+ if (bridge->is_going_away)
+ return;
+
list_for_each_entry(slot, &bridge->slots, node) {
struct pci_bus *bus = slot->bus;
struct pci_dev *dev, *tmp;
@@ -805,6 +812,8 @@ void acpiphp_check_host_bridge(acpi_handle handle)
}
}
+static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
+
static void hotplug_event(acpi_handle handle, u32 type, void *data)
{
struct acpiphp_context *context = data;
@@ -834,6 +843,9 @@ static void hotplug_event(acpi_handle handle, u32 type, void *data)
} else {
struct acpiphp_slot *slot = func->slot;
+ if (slot->flags & SLOT_IS_GOING_AWAY)
+ break;
+
mutex_lock(&slot->crit_sect);
enable_slot(slot);
mutex_unlock(&slot->crit_sect);
@@ -849,6 +861,9 @@ static void hotplug_event(acpi_handle handle, u32 type, void *data)
struct acpiphp_slot *slot = func->slot;
int ret;
+ if (slot->flags & SLOT_IS_GOING_AWAY)
+ break;
+
/*
* Check if anything has changed in the slot and rescan
* from the parent if that's the case.
@@ -878,9 +893,11 @@ static void hotplug_event_work(void *data, u32 type)
acpi_handle handle = context->handle;
acpi_scan_lock_acquire();
+ pci_lock_rescan_remove();
hotplug_event(handle, type, context);
+ pci_unlock_rescan_remove();
acpi_scan_lock_release();
acpi_evaluate_hotplug_ost(handle, type, ACPI_OST_SC_SUCCESS, NULL);
put_bridge(context->func.parent);
@@ -1048,12 +1065,19 @@ void acpiphp_remove_slots(struct pci_bus *bus)
*/
int acpiphp_enable_slot(struct acpiphp_slot *slot)
{
+ pci_lock_rescan_remove();
+
+ if (slot->flags & SLOT_IS_GOING_AWAY)
+ return -ENODEV;
+
mutex_lock(&slot->crit_sect);
/* configure all functions */
if (!(slot->flags & SLOT_ENABLED))
enable_slot(slot);
mutex_unlock(&slot->crit_sect);
+
+ pci_unlock_rescan_remove();
return 0;
}
@@ -1061,10 +1085,12 @@ int acpiphp_enable_slot(struct acpiphp_slot *slot)
* acpiphp_disable_and_eject_slot - power off and eject slot
* @slot: ACPI PHP slot
*/
-int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
+static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
{
struct acpiphp_func *func;
- int retval = 0;
+
+ if (slot->flags & SLOT_IS_GOING_AWAY)
+ return -ENODEV;
mutex_lock(&slot->crit_sect);
@@ -1082,9 +1108,18 @@ int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
}
mutex_unlock(&slot->crit_sect);
- return retval;
+ return 0;
}
+int acpiphp_disable_slot(struct acpiphp_slot *slot)
+{
+ int ret;
+
+ pci_lock_rescan_remove();
+ ret = acpiphp_disable_and_eject_slot(slot);
+ pci_unlock_rescan_remove();
+ return ret;
+}
/*
* slot enabled: 1
@@ -1095,7 +1130,6 @@ u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
return (slot->flags & SLOT_ENABLED);
}
-
/*
* latch open: 1
* latch closed: 0
@@ -1105,7 +1139,6 @@ u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
}
-
/*
* adapter presence : 1
* absence : 0