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PCI/ACPI: Protect acpi_pci_drivers list with mutex 

Use mutex to protect global acpi_pci_drivers list against PCI
host bridge hotplug operations.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Taku Izumi 2012-09-18 15:21:31 +09:00 committed by Bjorn Helgaas
parent c8e9afb124
commit d0020f6522
1 changed files with 19 additions and 17 deletions
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36
drivers/acpi/pci_root.c
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@ -27,7 +27,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/pci.h>
@ -71,6 +71,8 @@ static struct acpi_driver acpi_pci_root_driver = {
},
};
/* Lock to protect both acpi_pci_roots and acpi_pci_drivers lists */
static DEFINE_MUTEX(acpi_pci_root_lock);
static LIST_HEAD(acpi_pci_roots);
static LIST_HEAD(acpi_pci_drivers);
@ -81,34 +83,30 @@ int acpi_pci_register_driver(struct acpi_pci_driver *driver)
int n = 0;
struct acpi_pci_root *root;
mutex_lock(&acpi_pci_root_lock);
list_add_tail(&driver->node, &acpi_pci_drivers);
if (!driver->add)
return 0;
list_for_each_entry(root, &acpi_pci_roots, node) {
driver->add(root->device->handle);
n++;
}
if (driver->add)
list_for_each_entry(root, &acpi_pci_roots, node) {
driver->add(root->device->handle);
n++;
}
mutex_unlock(&acpi_pci_root_lock);
return n;
}
EXPORT_SYMBOL(acpi_pci_register_driver);
void acpi_pci_unregister_driver(struct acpi_pci_driver *driver)
{
struct acpi_pci_root *root;
mutex_lock(&acpi_pci_root_lock);
list_del(&driver->node);
if (!driver->remove)
return;
list_for_each_entry(root, &acpi_pci_roots, node)
driver->remove(root->device->handle);
if (driver->remove)
list_for_each_entry(root, &acpi_pci_roots, node)
driver->remove(root->device->handle);
mutex_unlock(&acpi_pci_root_lock);
}
EXPORT_SYMBOL(acpi_pci_unregister_driver);
acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
@ -628,9 +626,11 @@ static int acpi_pci_root_start(struct acpi_device *device)
struct acpi_pci_root *root = acpi_driver_data(device);
struct acpi_pci_driver *driver;
mutex_lock(&acpi_pci_root_lock);
list_for_each_entry(driver, &acpi_pci_drivers, node)
if (driver->add)
driver->add(device->handle);
mutex_unlock(&acpi_pci_root_lock);
pci_bus_add_devices(root->bus);
@ -642,9 +642,11 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
struct acpi_pci_root *root = acpi_driver_data(device);
struct acpi_pci_driver *driver;
mutex_lock(&acpi_pci_root_lock);
list_for_each_entry(driver, &acpi_pci_drivers, node)
if (driver->remove)
driver->remove(root->device->handle);
mutex_unlock(&acpi_pci_root_lock);
device_set_run_wake(root->bus->bridge, false);
pci_acpi_remove_bus_pm_notifier(device);