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path: root/drivers/acpi
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-rw-r--r--drivers/acpi/acpi_processor.c3
-rw-r--r--drivers/acpi/glue.c133
-rw-r--r--drivers/acpi/proc.c8
-rw-r--r--drivers/acpi/video.c2
4 files changed, 112 insertions, 34 deletions
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index fd6c51cc3acb..5a74a9c1e42c 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -451,7 +451,6 @@ static void acpi_processor_remove(struct acpi_device *device)
/* Clean up. */
per_cpu(processor_device_array, pr->id) = NULL;
per_cpu(processors, pr->id) = NULL;
- try_offline_node(cpu_to_node(pr->id));
/* Remove the CPU. */
get_online_cpus();
@@ -459,6 +458,8 @@ static void acpi_processor_remove(struct acpi_device *device)
acpi_unmap_lsapic(pr->id);
put_online_cpus();
+ try_offline_node(cpu_to_node(pr->id));
+
out:
free_cpumask_var(pr->throttling.shared_cpu_map);
kfree(pr);
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index f68095756fb7..408f6b2a5fa8 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -31,6 +31,7 @@ static LIST_HEAD(bus_type_list);
static DECLARE_RWSEM(bus_type_sem);
#define PHYSICAL_NODE_STRING "physical_node"
+#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
int register_acpi_bus_type(struct acpi_bus_type *type)
{
@@ -78,41 +79,108 @@ static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
return ret;
}
-static acpi_status do_acpi_find_child(acpi_handle handle, u32 lvl_not_used,
- void *addr_p, void **ret_p)
+static acpi_status acpi_dev_present(acpi_handle handle, u32 lvl_not_used,
+ void *not_used, void **ret_p)
{
- unsigned long long addr, sta;
- acpi_status status;
+ struct acpi_device *adev = NULL;
- status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
- if (ACPI_SUCCESS(status) && addr == *((u64 *)addr_p)) {
+ acpi_bus_get_device(handle, &adev);
+ if (adev) {
*ret_p = handle;
- status = acpi_bus_get_status_handle(handle, &sta);
- if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_ENABLED))
- return AE_CTRL_TERMINATE;
+ return AE_CTRL_TERMINATE;
}
return AE_OK;
}
-acpi_handle acpi_get_child(acpi_handle parent, u64 address)
+static bool acpi_extra_checks_passed(acpi_handle handle, bool is_bridge)
{
- void *ret = NULL;
+ unsigned long long sta;
+ acpi_status status;
+
+ status = acpi_bus_get_status_handle(handle, &sta);
+ if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
+ return false;
+
+ if (is_bridge) {
+ void *test = NULL;
+
+ /* Check if this object has at least one child device. */
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
+ acpi_dev_present, NULL, NULL, &test);
+ return !!test;
+ }
+ return true;
+}
+
+struct find_child_context {
+ u64 addr;
+ bool is_bridge;
+ acpi_handle ret;
+ bool ret_checked;
+};
+
+static acpi_status do_find_child(acpi_handle handle, u32 lvl_not_used,
+ void *data, void **not_used)
+{
+ struct find_child_context *context = data;
+ unsigned long long addr;
+ acpi_status status;
- if (!parent)
- return NULL;
+ status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
+ if (ACPI_FAILURE(status) || addr != context->addr)
+ return AE_OK;
- acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, NULL,
- do_acpi_find_child, &address, &ret);
- return (acpi_handle)ret;
+ if (!context->ret) {
+ /* This is the first matching object. Save its handle. */
+ context->ret = handle;
+ return AE_OK;
+ }
+ /*
+ * There is more than one matching object with the same _ADR value.
+ * That really is unexpected, so we are kind of beyond the scope of the
+ * spec here. We have to choose which one to return, though.
+ *
+ * First, check if the previously found object is good enough and return
+ * its handle if so. Second, check the same for the object that we've
+ * just found.
+ */
+ if (!context->ret_checked) {
+ if (acpi_extra_checks_passed(context->ret, context->is_bridge))
+ return AE_CTRL_TERMINATE;
+ else
+ context->ret_checked = true;
+ }
+ if (acpi_extra_checks_passed(handle, context->is_bridge)) {
+ context->ret = handle;
+ return AE_CTRL_TERMINATE;
+ }
+ return AE_OK;
}
-EXPORT_SYMBOL(acpi_get_child);
+
+acpi_handle acpi_find_child(acpi_handle parent, u64 addr, bool is_bridge)
+{
+ if (parent) {
+ struct find_child_context context = {
+ .addr = addr,
+ .is_bridge = is_bridge,
+ };
+
+ acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, do_find_child,
+ NULL, &context, NULL);
+ return context.ret;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(acpi_find_child);
int acpi_bind_one(struct device *dev, acpi_handle handle)
{
struct acpi_device *acpi_dev;
acpi_status status;
struct acpi_device_physical_node *physical_node, *pn;
- char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
+ char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
+ struct list_head *physnode_list;
+ unsigned int node_id;
int retval = -EINVAL;
if (ACPI_HANDLE(dev)) {
@@ -139,25 +207,27 @@ int acpi_bind_one(struct device *dev, acpi_handle handle)
mutex_lock(&acpi_dev->physical_node_lock);
- /* Sanity check. */
- list_for_each_entry(pn, &acpi_dev->physical_node_list, node)
+ /*
+ * Keep the list sorted by node_id so that the IDs of removed nodes can
+ * be recycled easily.
+ */
+ physnode_list = &acpi_dev->physical_node_list;
+ node_id = 0;
+ list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
+ /* Sanity check. */
if (pn->dev == dev) {
dev_warn(dev, "Already associated with ACPI node\n");
goto err_free;
}
-
- /* allocate physical node id according to physical_node_id_bitmap */
- physical_node->node_id =
- find_first_zero_bit(acpi_dev->physical_node_id_bitmap,
- ACPI_MAX_PHYSICAL_NODE);
- if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) {
- retval = -ENOSPC;
- goto err_free;
+ if (pn->node_id == node_id) {
+ physnode_list = &pn->node;
+ node_id++;
+ }
}
- set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap);
+ physical_node->node_id = node_id;
physical_node->dev = dev;
- list_add_tail(&physical_node->node, &acpi_dev->physical_node_list);
+ list_add(&physical_node->node, physnode_list);
acpi_dev->physical_node_count++;
mutex_unlock(&acpi_dev->physical_node_lock);
@@ -208,7 +278,7 @@ int acpi_unbind_one(struct device *dev)
mutex_lock(&acpi_dev->physical_node_lock);
list_for_each_safe(node, next, &acpi_dev->physical_node_list) {
- char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
+ char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
entry = list_entry(node, struct acpi_device_physical_node,
node);
@@ -216,7 +286,6 @@ int acpi_unbind_one(struct device *dev)
continue;
list_del(node);
- clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap);
acpi_dev->physical_node_count--;
diff --git a/drivers/acpi/proc.c b/drivers/acpi/proc.c
index aa1227a7e3f2..04a13784dd20 100644
--- a/drivers/acpi/proc.c
+++ b/drivers/acpi/proc.c
@@ -311,6 +311,8 @@ acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
dev->pnp.bus_id,
(u32) dev->wakeup.sleep_state);
+ mutex_lock(&dev->physical_node_lock);
+
if (!dev->physical_node_count) {
seq_printf(seq, "%c%-8s\n",
dev->wakeup.flags.run_wake ? '*' : ' ',
@@ -338,6 +340,8 @@ acpi_system_wakeup_device_seq_show(struct seq_file *seq, void *offset)
put_device(ldev);
}
}
+
+ mutex_unlock(&dev->physical_node_lock);
}
mutex_unlock(&acpi_device_lock);
return 0;
@@ -347,12 +351,16 @@ static void physical_device_enable_wakeup(struct acpi_device *adev)
{
struct acpi_device_physical_node *entry;
+ mutex_lock(&adev->physical_node_lock);
+
list_for_each_entry(entry,
&adev->physical_node_list, node)
if (entry->dev && device_can_wakeup(entry->dev)) {
bool enable = !device_may_wakeup(entry->dev);
device_set_wakeup_enable(entry->dev, enable);
}
+
+ mutex_unlock(&adev->physical_node_lock);
}
static ssize_t
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 0ec434d2586d..e1284b8dc6ee 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -689,7 +689,7 @@ static int acpi_video_bqc_quirk(struct acpi_video_device *device,
* Some systems always report current brightness level as maximum
* through _BQC, we need to test another value for them.
*/
- test_level = current_level == max_level ? br->levels[2] : max_level;
+ test_level = current_level == max_level ? br->levels[3] : max_level;
result = acpi_video_device_lcd_set_level(device, test_level);
if (result)