Serialize access to the bridge_list in the acpiphp driver. Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx> Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx> --- drivers/pci/hotplug/acpiphp_glue.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 16fe692..884cbf4 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -53,6 +53,7 @@ #include "../pci.h" #include "acpiphp.h" +static DEFINE_MUTEX(bridge_mutex); static LIST_HEAD(bridge_list); #define MY_NAME "acpiphp_glue" @@ -519,8 +520,10 @@ static int add_bridge(struct acpi_pci_root *root) } /* search P2P bridges under this host bridge */ + mutex_lock(&bridge_mutex); status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, find_p2p_bridge, NULL, NULL, NULL); + mutex_unlock(&bridge_mutex); if (ACPI_FAILURE(status)) warn("find_p2p_bridge failed (error code = 0x%x)\n", status); @@ -618,6 +621,8 @@ static void remove_bridge(struct acpi_pci_root *root) struct acpiphp_bridge *bridge; acpi_handle handle = root->device->handle; + mutex_lock(&bridge_mutex); + /* cleanup p2p bridges under this host bridge in a depth-first manner */ acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, @@ -636,6 +641,8 @@ static void remove_bridge(struct acpi_pci_root *root) else acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, handle_hotplug_event_bridge); + + mutex_unlock(&bridge_mutex); } static int power_on_slot(struct acpiphp_slot *slot) @@ -1438,11 +1445,13 @@ static void acpiphp_hp_notify_add(struct pci_dev *dev) if (!dev->subordinate || !handle) return; + mutex_lock(&bridge_mutex); /* check if this bridge has ejectable slots */ if (detect_ejectable_slots(handle) > 0) { dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); add_p2p_bridge(handle); } + mutex_unlock(&bridge_mutex); } static void acpiphp_hp_notify_del(struct pci_dev *dev) @@ -1453,11 +1462,13 @@ static void acpiphp_hp_notify_del(struct pci_dev *dev) if (!bus) return; + mutex_lock(&bridge_mutex); list_for_each_entry_safe(bridge, tmp, &bridge_list, list) if (bridge->pci_bus == bus) { cleanup_bridge(bridge); break; } + mutex_unlock(&bridge_mutex); } static int acpi_pci_hp_notify_fn(struct notifier_block *nb, -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html