ACPI / hotplug / PCI: Hotplug notifications from acpi_bus_notify()
Since acpi_bus_notify() is executed on all notifications for all
devices anyway, make it execute acpi_device_hotplug() for all
hotplug events instead of installing notify handlers pointing to
the same function for all hotplug devices.
This change reduces both the size and complexity of ACPI-based device
hotplug code. Moreover, since acpi_device_hotplug() only does
significant things for devices that have either an ACPI scan handler,
or a hotplug context with .eject() defined, and those devices
had notify handlers pointing to acpi_hotplug_notify_cb() installed
before anyway, this modification shouldn't change functionality.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index c323777..e61e7b8 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -340,62 +340,77 @@
*/
static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
{
- struct acpi_device *device;
+ struct acpi_device *adev;
struct acpi_driver *driver;
-
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
- type, handle));
+ acpi_status status;
+ u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
switch (type) {
-
case ACPI_NOTIFY_BUS_CHECK:
- /* TBD */
+ acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
break;
case ACPI_NOTIFY_DEVICE_CHECK:
- /* TBD */
+ acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
break;
case ACPI_NOTIFY_DEVICE_WAKE:
- /* TBD */
+ acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
break;
case ACPI_NOTIFY_EJECT_REQUEST:
- /* TBD */
+ acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
break;
case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
+ acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
/* TBD: Exactly what does 'light' mean? */
break;
case ACPI_NOTIFY_FREQUENCY_MISMATCH:
- /* TBD */
+ acpi_handle_err(handle, "Device cannot be configured due "
+ "to a frequency mismatch\n");
break;
case ACPI_NOTIFY_BUS_MODE_MISMATCH:
- /* TBD */
+ acpi_handle_err(handle, "Device cannot be configured due "
+ "to a bus mode mismatch\n");
break;
case ACPI_NOTIFY_POWER_FAULT:
- /* TBD */
+ acpi_handle_err(handle, "Device has suffered a power fault\n");
break;
default:
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Received unknown/unsupported notification [%08x]\n",
- type));
+ acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type);
+ ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY;
+ goto err;
+ }
+
+ adev = acpi_bus_get_acpi_device(handle);
+ if (!adev)
+ goto err;
+
+ driver = adev->driver;
+ if (driver && driver->ops.notify &&
+ (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
+ driver->ops.notify(adev, type);
+
+ switch (type) {
+ case ACPI_NOTIFY_BUS_CHECK:
+ case ACPI_NOTIFY_DEVICE_CHECK:
+ case ACPI_NOTIFY_EJECT_REQUEST:
+ status = acpi_hotplug_execute(acpi_device_hotplug, adev, type);
+ if (ACPI_SUCCESS(status))
+ return;
+ default:
break;
}
+ acpi_bus_put_acpi_device(adev);
+ return;
- device = acpi_bus_get_acpi_device(handle);
- if (device) {
- driver = device->driver;
- if (driver && driver->ops.notify &&
- (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
- driver->ops.notify(device, type);
-
- acpi_bus_put_acpi_device(device);
- }
+ err:
+ acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
}
/* --------------------------------------------------------------------------
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index dedbb2d..143d5df 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -73,6 +73,7 @@
#endif
bool acpi_queue_hotplug_work(struct work_struct *work);
+void acpi_device_hotplug(void *data, u32 src);
bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent);
/* --------------------------------------------------------------------------
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 59f9e27..8bb48bf 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -470,7 +470,7 @@
return -EINVAL;
}
-static void acpi_device_hotplug(void *data, u32 src)
+void acpi_device_hotplug(void *data, u32 src)
{
u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
struct acpi_device *adev = data;
@@ -520,75 +520,6 @@
unlock_device_hotplug();
}
-static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
-{
- u32 ost_code = ACPI_OST_SC_SUCCESS;
- struct acpi_device *adev;
- acpi_status status;
-
- switch (type) {
- case ACPI_NOTIFY_BUS_CHECK:
- acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
- break;
-
- case ACPI_NOTIFY_DEVICE_CHECK:
- acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
- break;
-
- case ACPI_NOTIFY_EJECT_REQUEST:
- acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
- break;
-
- case ACPI_NOTIFY_DEVICE_WAKE:
- return;
-
- case ACPI_NOTIFY_FREQUENCY_MISMATCH:
- acpi_handle_err(handle, "Device cannot be configured due "
- "to a frequency mismatch\n");
- goto out;
-
- case ACPI_NOTIFY_BUS_MODE_MISMATCH:
- acpi_handle_err(handle, "Device cannot be configured due "
- "to a bus mode mismatch\n");
- goto out;
-
- case ACPI_NOTIFY_POWER_FAULT:
- acpi_handle_err(handle, "Device has suffered a power fault\n");
- goto out;
-
- default:
- acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type);
- ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY;
- goto out;
- }
-
- ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
- adev = acpi_bus_get_acpi_device(handle);
- if (!adev)
- goto out;
-
- status = acpi_hotplug_execute(acpi_device_hotplug, adev, type);
- if (ACPI_SUCCESS(status))
- return;
-
- acpi_bus_put_acpi_device(adev);
-
- out:
- acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
-}
-
-void acpi_install_hotplug_notify_handler(acpi_handle handle)
-{
- acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
- acpi_hotplug_notify_cb, NULL);
-}
-
-void acpi_remove_hotplug_notify_handler(acpi_handle handle)
-{
- acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
- acpi_hotplug_notify_cb);
-}
-
static ssize_t real_power_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -2037,12 +1968,10 @@
struct acpi_scan_handler *handler;
handler = acpi_scan_match_handler(hwid->id, NULL);
- if (!handler)
- continue;
-
- acpi_install_hotplug_notify_handler(adev->handle);
- adev->flags.hotplug_notify = true;
- break;
+ if (handler) {
+ adev->flags.hotplug_notify = true;
+ break;
+ }
}
}