HSI: core: switch port event notifier from atomic to blocking

port events should be sent from process context after
irq_safe runtime pm flag is removed in omap-ssi.

Signed-off-By: Sebastian Reichel <[e-mail]>
Tested-by: Pavel Machek <[e-mail]>

drivers/hsi/hsi_core.c

···
 		port[i]->stop_tx = hsi_dummy_cl;
 		port[i]->release = hsi_dummy_cl;
 		mutex_init(&port[i]->lock);
-		ATOMIC_INIT_NOTIFIER_HEAD(&port[i]->n_head);
+		BLOCKING_INIT_NOTIFIER_HEAD(&port[i]->n_head);
 		dev_set_name(&port[i]->device, "port%d", i);
 		hsi->port[i]->device.release = hsi_port_release;
 		device_initialize(&hsi->port[i]->device);
···
 	cl->ehandler = handler;
 	cl->nb.notifier_call = hsi_event_notifier_call;
 
-	return atomic_notifier_chain_register(&port->n_head, &cl->nb);
+	return blocking_notifier_chain_register(&port->n_head, &cl->nb);
 }
 EXPORT_SYMBOL_GPL(hsi_register_port_event);
 
···
 
 	WARN_ON(!hsi_port_claimed(cl));
 
-	err = atomic_notifier_chain_unregister(&port->n_head, &cl->nb);
+	err = blocking_notifier_chain_unregister(&port->n_head, &cl->nb);
 	if (!err)
 		cl->ehandler = NULL;
 
···
  */
 int hsi_event(struct hsi_port *port, unsigned long event)
 {
-	return atomic_notifier_call_chain(&port->n_head, event, NULL);
+	return blocking_notifier_call_chain(&port->n_head, event, NULL);
 }
 EXPORT_SYMBOL_GPL(hsi_event);
 

include/linux/hsi/hsi.h

···
 	int				(*stop_tx)(struct hsi_client *cl);
 	int				(*release)(struct hsi_client *cl);
 	/* private */
-	struct atomic_notifier_head	n_head;
+	struct blocking_notifier_head	n_head;
 };
 
 #define to_hsi_port(dev) container_of(dev, struct hsi_port, device)