hotplug: wait for device initialization

Signed-off-by: Jaroslav Škarvada <[email protected]>

tuned/consts.py

@@ -215,3 +215,8 @@
 		"console": LOG_LEVEL_CONSOLE,
 		"none": None,
 		}
+
+# number of retries when waiting for device initialization
+HOTPLUG_WAIT_FOR_DEV_INIT_RETRIES = 100
+# how long to wait for device initialization in seconds during retry
+HOTPLUG_WAIT_FOR_DEV_INIT_DELAY = 0.1

tuned/hardware/inventory.py

@@ -54,6 +54,14 @@ def _handle_udev_event(self, event, device):
 		if not device.subsystem in self._subscriptions:
 			return
 
+		retry = consts.HOTPLUG_WAIT_FOR_DEV_INIT_RETRIES
+		while not device.is_initialized and retry > 0:
+			log.debug("Device '%s' is uninitialized, waiting '%d' seconds for its initialization." % (device, consts.HOTPLUG_WAIT_FOR_DEV_INIT_DELAY))
+			time.sleep(consts.HOTPLUG_WAIT_FOR_DEV_INIT_DELAY)
+			retry =- 1
+		if not device.is_initialized:
+			log.warn("Unsuccessfully waited for device '%s' initialization, continuing with uninitialized device, problems may occur." % device)
+
 		for (plugin, callback) in self._subscriptions[device.subsystem]:
 			try:
 				callback(event, device)