firmware: arm_scmi: Move handle get/set helpers

Move handle get/set helpers definitions into driver.c and invoke them
through the bus notifier helper.
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20221222185049.737625-7-cristian.marussi@arm.comSigned-off-by: Sudeep Holla <sudeep.holla@arm.com>

drivers/firmware/arm_scmi/bus.c

@@ -344,27 +344,10 @@ scmi_device_create(struct device_node *np, struct device *parent, int protocol,
 void scmi_device_destroy(struct scmi_device *scmi_dev)
 {
 	kfree_const(scmi_dev->name);
-	scmi_handle_put(scmi_dev->handle);
 	ida_free(&scmi_bus_id, scmi_dev->id);
 	device_unregister(&scmi_dev->dev);
 }
 
-void scmi_device_link_add(struct device *consumer, struct device *supplier)
-{
-	struct device_link *link;
-
-	link = device_link_add(consumer, supplier, DL_FLAG_AUTOREMOVE_CONSUMER);
-
-	WARN_ON(!link);
-}
-
-void scmi_set_handle(struct scmi_device *scmi_dev)
-{
-	scmi_dev->handle = scmi_handle_get(&scmi_dev->dev);
-	if (scmi_dev->handle)
-		scmi_device_link_add(&scmi_dev->dev, scmi_dev->handle->dev);
-}
-
 static int __scmi_devices_unregister(struct device *dev, void *data)
 {
 	struct scmi_device *scmi_dev = to_scmi_dev(dev);

drivers/firmware/arm_scmi/common.h

@@ -96,10 +96,6 @@ static inline void unpack_scmi_header(u32 msg_hdr, struct scmi_msg_hdr *hdr)
 
 struct scmi_revision_info *
 scmi_revision_area_get(const struct scmi_protocol_handle *ph);
-int scmi_handle_put(const struct scmi_handle *handle);
-void scmi_device_link_add(struct device *consumer, struct device *supplier);
-struct scmi_handle *scmi_handle_get(struct device *dev);
-void scmi_set_handle(struct scmi_device *scmi_dev);
 void scmi_setup_protocol_implemented(const struct scmi_protocol_handle *ph,
 				     u8 *prot_imp);
 

drivers/firmware/arm_scmi/driver.c

@@ -1890,13 +1890,6 @@ static bool scmi_is_transport_atomic(const struct scmi_handle *handle,
 	return ret;
 }
 
-static inline
-struct scmi_handle *scmi_handle_get_from_info_unlocked(struct scmi_info *info)
-{
-	info->users++;
-	return &info->handle;
-}
-
 /**
  * scmi_handle_get() - Get the SCMI handle for a device
  *
@@ -1908,7 +1901,7 @@ struct scmi_handle *scmi_handle_get_from_info_unlocked(struct scmi_info *info)
  *
  * Return: pointer to handle if successful, NULL on error
  */
-struct scmi_handle *scmi_handle_get(struct device *dev)
+static struct scmi_handle *scmi_handle_get(struct device *dev)
 {
 	struct list_head *p;
 	struct scmi_info *info;
@@ -1918,7 +1911,8 @@ struct scmi_handle *scmi_handle_get(struct device *dev)
 	list_for_each(p, &scmi_list) {
 		info = list_entry(p, struct scmi_info, node);
 		if (dev->parent == info->dev) {
-			handle = scmi_handle_get_from_info_unlocked(info);
+			info->users++;
+			handle = &info->handle;
 			break;
 		}
 	}
@@ -1939,7 +1933,7 @@ struct scmi_handle *scmi_handle_get(struct device *dev)
  * Return: 0 is successfully released
  *	if null was passed, it returns -EINVAL;
  */
-int scmi_handle_put(const struct scmi_handle *handle)
+static int scmi_handle_put(const struct scmi_handle *handle)
 {
 	struct scmi_info *info;
 
@@ -1955,6 +1949,23 @@ int scmi_handle_put(const struct scmi_handle *handle)
 	return 0;
 }
 
+static void scmi_device_link_add(struct device *consumer,
+				 struct device *supplier)
+{
+	struct device_link *link;
+
+	link = device_link_add(consumer, supplier, DL_FLAG_AUTOREMOVE_CONSUMER);
+
+	WARN_ON(!link);
+}
+
+static void scmi_set_handle(struct scmi_device *scmi_dev)
+{
+	scmi_dev->handle = scmi_handle_get(&scmi_dev->dev);
+	if (scmi_dev->handle)
+		scmi_device_link_add(&scmi_dev->dev, scmi_dev->handle->dev);
+}
+
 static int __scmi_xfer_info_init(struct scmi_info *sinfo,
 				 struct scmi_xfers_info *info)
 {
@@ -2234,8 +2245,12 @@ static int scmi_bus_notifier(struct notifier_block *nb,
 
 	switch (action) {
 	case BUS_NOTIFY_BIND_DRIVER:
+		/* setup handle now as the transport is ready */
+		scmi_set_handle(sdev);
 		break;
 	case BUS_NOTIFY_UNBOUND_DRIVER:
+		scmi_handle_put(sdev->handle);
+		sdev->handle = NULL;
 		break;
 	default:
 		return NOTIFY_DONE;