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ACPI: Update _OST handling for notify

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When the kernel calls _OSC with OSC_SB_HOTPLUG_OST_SUPPORT bit
set at boot-time, the OS is responsible for calling _OST for
ACPI hotplug events.  However, when hotplug.enabled attribute
is unset for ACPI scan drivers, their notify handlers are removed
and _OST is not called for ACPI hotplug events as a result.

This patch keeps the notify handler of ACPI scan drivers,
acpi_hotplug_notify_cb(), installed regardless of the state of
hotplug.enabled.  The notify handler then checks if hotplug.enabled
is set for the associated scan handler.  If unset, the notify
handler calls _OST with a proper error code.  The patch also
eliminates ACPI namespace walk when hotplug.enabled is changed
via sysfs.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Toshi Kani 2013-03-05 22:33:31 +00:00 committed by Rafael J. Wysocki
parent 6b772e8f9e
commit 2cbb14fb70
1 changed files with 35 additions and 52 deletions
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87
drivers/acpi/scan.c
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@ -259,11 +259,43 @@ static void acpi_scan_device_check(void *context)
ACPI_NOTIFY_DEVICE_CHECK);
}
static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *not_used)
static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
{
u32 ost_status;
switch (type) {
case ACPI_NOTIFY_BUS_CHECK:
acpi_handle_debug(handle,
"ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
break;
case ACPI_NOTIFY_DEVICE_CHECK:
acpi_handle_debug(handle,
"ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
break;
case ACPI_NOTIFY_EJECT_REQUEST:
acpi_handle_debug(handle,
"ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
break;
default:
/* non-hotplug event; possibly handled by other handler */
return;
}
acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
}
static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
{
acpi_osd_exec_callback callback;
struct acpi_scan_handler *handler = data;
acpi_status status;
if (!handler->hotplug.enabled)
return acpi_hotplug_unsupported(handle, type);
switch (type) {
case ACPI_NOTIFY_BUS_CHECK:
acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
@ -1715,61 +1747,14 @@ static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
return NULL;
}
static acpi_status acpi_scan_hotplug_modify(acpi_handle handle,
u32 lvl_not_used, void *data,
void **ret_not_used)
{
struct acpi_device_pnp pnp = {};
struct acpi_scan_handler *tgt_handler = data, *handler;
struct acpi_hardware_id *hwid;
unsigned long long sta_not_used;
int type;
bool match = false;
if (acpi_bus_type_and_status(handle, &type, &sta_not_used))
return AE_OK;
INIT_LIST_HEAD(&pnp.ids);
acpi_set_pnp_ids(handle, &pnp, type);
if (!pnp.type.hardware_id)
return AE_OK;
list_for_each_entry(hwid, &pnp.ids, list) {
handler = acpi_scan_match_handler(hwid->id, NULL);
if (handler && handler == tgt_handler) {
match = true;
break;
}
}
if (!match)
goto out;
if (handler->hotplug.enabled)
acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
acpi_hotplug_notify_cb, NULL);
else
acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
acpi_hotplug_notify_cb);
out:
acpi_free_pnp_ids(&pnp);
return AE_OK;
}
void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
{
struct acpi_scan_handler *handler;
if (!!hotplug->enabled == !!val)
return;
mutex_lock(&acpi_scan_lock);
hotplug->enabled = val;
handler = container_of(hotplug, struct acpi_scan_handler, hotplug);
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
acpi_scan_hotplug_modify, NULL, handler, NULL);
mutex_unlock(&acpi_scan_lock);
}
@ -1793,10 +1778,8 @@ static void acpi_scan_init_hotplug(acpi_handle handle, int type)
list_for_each_entry(hwid, &pnp.ids, list) {
handler = acpi_scan_match_handler(hwid->id, NULL);
if (handler) {
if (handler->hotplug.enabled)
acpi_install_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
acpi_hotplug_notify_cb, NULL);
acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
acpi_hotplug_notify_cb, handler);
break;
}
}