Message-Id: <1434394615-3754-16-git-send-email-tomas.winkler@intel.com>
Date:	Mon, 15 Jun 2015 21:56:55 +0300
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	gregkh@...uxfoundation.org
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 15/15 V2] mei: bus: link client devices instead of host clients

MEI bus was designed around nfc and was hard to extend.
Instead of the hard coded way of adding the devices on the mei bus
we scan the whole me client list and create a device for each
eligible me client (mei_cl_bus_rescan); currently we support
only clients with single connection and fixed address clients.
NFC radio name detection is run as a fixup routine

The patch replaces handling the device list based on struct me_cl
to device list based on me_cl_devices. The creating a connection
is pushed from the device creation time to device enablement.

Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
V2: Resend
 drivers/misc/mei/bus-fixup.c | 287 ++++++++++---------------------------------
 drivers/misc/mei/bus.c       | 225 +++++++++++++++++++++------------
 drivers/misc/mei/client.c    |   9 +-
 drivers/misc/mei/init.c      |   2 -
 drivers/misc/mei/mei_dev.h   |  11 +-
 5 files changed, 209 insertions(+), 325 deletions(-)

diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index 74ac6a583456..3e536ca85f7d 100644
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -30,6 +30,11 @@
 #define MEI_UUID_NFC_INFO UUID_LE(0xd2de1625, 0x382d, 0x417d, \
 			0x48, 0xa4, 0xef, 0xab, 0xba, 0x8a, 0x12, 0x06)
 
+static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;
+
+#define MEI_UUID_NFC_HCI UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, \
+			0x94, 0xd4, 0x50, 0x26, 0x67, 0x23, 0x77, 0x5c)
+
 #define MEI_UUID_ANY NULL_UUID_LE
 
 /**
@@ -93,68 +98,10 @@ struct mei_nfc_if_version {
 	u8 radio_type;
 } __packed;
 
-struct mei_nfc_connect {
-	u8 fw_ivn;
-	u8 vendor_id;
-} __packed;
-
-struct mei_nfc_connect_resp {
-	u8 fw_ivn;
-	u8 vendor_id;
-	u16 me_major;
-	u16 me_minor;
-	u16 me_hotfix;
-	u16 me_build;
-} __packed;
-
-struct mei_nfc_hci_hdr {
-	u8 cmd;
-	u8 status;
-	u16 req_id;
-	u32 reserved;
-	u16 data_size;
-} __packed;
 
 #define MEI_NFC_CMD_MAINTENANCE 0x00
-#define MEI_NFC_CMD_HCI_SEND 0x01
-#define MEI_NFC_CMD_HCI_RECV 0x02
-
-#define MEI_NFC_SUBCMD_CONNECT    0x00
 #define MEI_NFC_SUBCMD_IF_VERSION 0x01
 
-#define MEI_NFC_HEADER_SIZE 10
-
-/**
- * struct mei_nfc_dev - NFC mei device
- *
- * @me_cl: NFC me client
- * @cl: NFC host client
- * @cl_info: NFC info host client
- * @init_work: perform connection to the info client
- * @fw_ivn: NFC Interface Version Number
- * @vendor_id: NFC manufacturer ID
- * @radio_type: NFC radio type
- * @bus_name: bus name
- *
- */
-struct mei_nfc_dev {
-	struct mei_me_client *me_cl;
-	struct mei_cl *cl;
-	struct mei_cl *cl_info;
-	struct work_struct init_work;
-	u8 fw_ivn;
-	u8 vendor_id;
-	u8 radio_type;
-	const char *bus_name;
-};
-
-/* UUIDs for NFC F/W clients */
-const uuid_le mei_nfc_guid = UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50,
-				     0x94, 0xd4, 0x50, 0x26,
-				     0x67, 0x23, 0x77, 0x5c);
-
-static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;
-
 /* Vendors */
 #define MEI_NFC_VENDOR_INSIDE 0x00
 #define MEI_NFC_VENDOR_NXP    0x01
@@ -163,27 +110,6 @@ static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;
 #define MEI_NFC_VENDOR_INSIDE_UREAD 0x00
 #define MEI_NFC_VENDOR_NXP_PN544    0x01
 
-static void mei_nfc_free(struct mei_nfc_dev *ndev)
-{
-	if (!ndev)
-		return;
-
-	if (ndev->cl) {
-		list_del(&ndev->cl->device_link);
-		mei_cl_unlink(ndev->cl);
-		kfree(ndev->cl);
-	}
-
-	if (ndev->cl_info) {
-		list_del(&ndev->cl_info->device_link);
-		mei_cl_unlink(ndev->cl_info);
-		kfree(ndev->cl_info);
-	}
-
-	mei_me_cl_put(ndev->me_cl);
-	kfree(ndev);
-}
-
 /**
  * mei_nfc_if_version - get NFC interface version
  *
@@ -264,176 +190,86 @@ static const char *mei_nfc_radio_name(struct mei_nfc_if_version *ver)
 	return NULL;
 }
 
-static void mei_nfc_init(struct work_struct *work)
+/**
+ * mei_nfc - The nfc fixup function. The function retrieves nfc radio
+ *    name and set is as device attribute so we can load
+ *    the proper device driver for it
+ *
+ * @cldev: me client device (nfc)
+ */
+static void mei_nfc(struct mei_cl_device *cldev)
 {
 	struct mei_device *bus;
-	struct mei_cl_device *cldev;
-	struct mei_nfc_dev *ndev;
-	struct mei_cl *cl_info;
-	struct mei_me_client *me_cl_info;
-	struct mei_nfc_if_version version;
+	struct mei_cl *cl;
+	struct mei_me_client *me_cl = NULL;
+	struct mei_nfc_if_version ver;
+	const char *radio_name = NULL;
+	int ret;
 
-	ndev = container_of(work, struct mei_nfc_dev, init_work);
+	bus = cldev->bus;
 
-	cl_info = ndev->cl_info;
-	bus = cl_info->dev;
+	dev_dbg(bus->dev, "running hook %s: %pUl match=%d\n",
+		__func__, mei_me_cl_uuid(cldev->me_cl), cldev->do_match);
 
 	mutex_lock(&bus->device_lock);
-
-	/* check for valid client id */
-	me_cl_info = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid);
-	if (!me_cl_info) {
-		mutex_unlock(&bus->device_lock);
-		dev_info(bus->dev, "nfc: failed to find the info client\n");
-		goto err;
-	}
-
-	if (mei_cl_connect(cl_info, me_cl_info, NULL) < 0) {
-		mei_me_cl_put(me_cl_info);
-		mutex_unlock(&bus->device_lock);
-		dev_err(bus->dev, "Could not connect to the NFC INFO ME client");
-
-		goto err;
+	/* we need to connect to INFO GUID */
+	cl = mei_cl_alloc_linked(bus, MEI_HOST_CLIENT_ID_ANY);
+	if (IS_ERR(cl)) {
+		ret = PTR_ERR(cl);
+		cl = NULL;
+		dev_err(bus->dev, "nfc hook alloc failed %d\n", ret);
+		goto out;
 	}
-	mei_me_cl_put(me_cl_info);
-	mutex_unlock(&bus->device_lock);
 
-	if (mei_nfc_if_version(cl_info, &version) < 0) {
-		dev_err(bus->dev, "Could not get the NFC interface version");
-
-		goto err;
+	me_cl = mei_me_cl_by_uuid(bus, &mei_nfc_info_guid);
+	if (!me_cl) {
+		ret = -ENOTTY;
+		dev_err(bus->dev, "Cannot find nfc info %d\n", ret);
+		goto out;
 	}
 
-	ndev->fw_ivn = version.fw_ivn;
-	ndev->vendor_id = version.vendor_id;
-	ndev->radio_type = version.radio_type;
-
-	dev_info(bus->dev, "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
-		ndev->fw_ivn, ndev->vendor_id, ndev->radio_type);
-
-	mutex_lock(&bus->device_lock);
-
-	if (mei_cl_disconnect(cl_info) < 0) {
-		mutex_unlock(&bus->device_lock);
-		dev_err(bus->dev, "Could not disconnect the NFC INFO ME client");
-
-		goto err;
+	ret = mei_cl_connect(cl, me_cl, NULL);
+	if (ret < 0) {
+		dev_err(&cldev->dev, "Can't connect to the NFC INFO ME ret = %d\n",
+			ret);
+		goto out;
 	}
 
 	mutex_unlock(&bus->device_lock);
 
-	ndev->bus_name = mei_nfc_radio_name(&version);
+	ret = mei_nfc_if_version(cl, &ver);
+	if (ret)
+		goto disconnect;
 
-	if (!ndev->bus_name) {
-		dev_err(bus->dev, "Could not build the bus ID name\n");
-		return;
-	}
-
-	cldev = mei_cl_add_device(bus, ndev->me_cl, ndev->cl,
-				  ndev->bus_name);
-	if (!cldev) {
-		dev_err(bus->dev, "Could not add the NFC device to the MEI bus\n");
+	radio_name = mei_nfc_radio_name(&ver);
 
-		goto err;
+	if (!radio_name) {
+		ret = -ENOENT;
+		dev_err(&cldev->dev, "Can't get the NFC interface version ret = %d\n",
+			ret);
+		goto disconnect;
 	}
 
-	cldev->priv_data = ndev;
-
+	dev_dbg(bus->dev, "nfc radio %s\n", radio_name);
+	strlcpy(cldev->name, radio_name, sizeof(cldev->name));
 
-	return;
-
-err:
+disconnect:
 	mutex_lock(&bus->device_lock);
-	mei_nfc_free(ndev);
-	mutex_unlock(&bus->device_lock);
-
-}
-
-
-int mei_nfc_host_init(struct mei_device *bus, struct mei_me_client *me_cl)
-{
-	struct mei_nfc_dev *ndev;
-	struct mei_cl *cl_info, *cl;
-	int ret;
-
-
-	/* in case of internal reset bail out
-	 * as the device is already setup
-	 */
-	cl = mei_cl_bus_find_cl_by_uuid(bus, mei_nfc_guid);
-	if (cl)
-		return 0;
-
-	ndev = kzalloc(sizeof(struct mei_nfc_dev), GFP_KERNEL);
-	if (!ndev) {
-		ret = -ENOMEM;
-		goto err;
-	}
-
-	ndev->me_cl = mei_me_cl_get(me_cl);
-	if (!ndev->me_cl) {
-		ret = -ENODEV;
-		goto err;
-	}
+	if (mei_cl_disconnect(cl) < 0)
+		dev_err(bus->dev, "Can't disconnect the NFC INFO ME\n");
 
-	cl_info = mei_cl_alloc_linked(bus, MEI_HOST_CLIENT_ID_ANY);
-	if (IS_ERR(cl_info)) {
-		ret = PTR_ERR(cl_info);
-		goto err;
-	}
-
-	list_add_tail(&cl_info->device_link, &bus->device_list);
-
-	ndev->cl_info = cl_info;
-
-	cl = mei_cl_alloc_linked(bus, MEI_HOST_CLIENT_ID_ANY);
-	if (IS_ERR(cl)) {
-		ret = PTR_ERR(cl);
-		goto err;
-	}
-
-	list_add_tail(&cl->device_link, &bus->device_list);
-
-	ndev->cl = cl;
-
-	INIT_WORK(&ndev->init_work, mei_nfc_init);
-	schedule_work(&ndev->init_work);
-
-	return 0;
+	mei_cl_flush_queues(cl, NULL);
 
-err:
-	mei_nfc_free(ndev);
-
-	return ret;
-}
-
-void mei_nfc_host_exit(struct mei_device *bus)
-{
-	struct mei_nfc_dev *ndev;
-	struct mei_cl *cl;
-	struct mei_cl_device *cldev;
-
-	cl = mei_cl_bus_find_cl_by_uuid(bus, mei_nfc_guid);
-	if (!cl)
-		return;
-
-	cldev = cl->cldev;
-	if (!cldev)
-		return;
-
-	ndev = (struct mei_nfc_dev *)cldev->priv_data;
-	if (ndev)
-		cancel_work_sync(&ndev->init_work);
+out:
+	mei_cl_unlink(cl);
+	mutex_unlock(&bus->device_lock);
+	mei_me_cl_put(me_cl);
+	kfree(cl);
 
-	cldev->priv_data = NULL;
+	if (ret)
+		cldev->do_match = 0;
 
-	mutex_lock(&bus->device_lock);
-	/* Need to remove the device here
-	 * since mei_nfc_free will unlink the clients
-	 */
-	mei_cl_remove_device(cldev);
-	mei_nfc_free(ndev);
-	mutex_unlock(&bus->device_lock);
+	dev_dbg(bus->dev, "end of fixup match = %d\n", cldev->do_match);
 }
 
 #define MEI_FIXUP(_uuid, _hook) { _uuid, _hook }
@@ -445,6 +281,7 @@ static struct mei_fixup {
 } mei_fixups[] = {
 	MEI_FIXUP(MEI_UUID_ANY, number_of_connections),
 	MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
+	MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc),
 };
 
 /**
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 137104d339b6..681dbcbfbacb 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -308,34 +308,43 @@ EXPORT_SYMBOL_GPL(mei_cl_set_drvdata);
  */
 int mei_cl_enable_device(struct mei_cl_device *cldev)
 {
-	int err;
-	struct mei_device *bus;
-	struct mei_cl *cl = cldev->cl;
+	struct mei_device *bus = cldev->bus;
+	struct mei_cl *cl;
+	int ret;
 
-	if (cl == NULL)
-		return -ENODEV;
+	cl = cldev->cl;
 
-	bus = cl->dev;
+	if (!cl) {
+		mutex_lock(&bus->device_lock);
+		cl = mei_cl_alloc_linked(bus, MEI_HOST_CLIENT_ID_ANY);
+		mutex_unlock(&bus->device_lock);
+		if (IS_ERR(cl))
+			return PTR_ERR(cl);
+		/* update pointers */
+		cldev->cl = cl;
+		cl->cldev = cldev;
+	}
 
 	mutex_lock(&bus->device_lock);
-
 	if (mei_cl_is_connected(cl)) {
-		mutex_unlock(&bus->device_lock);
-		dev_warn(bus->dev, "Already connected");
-		return -EBUSY;
+		ret = 0;
+		goto out;
 	}
 
-	err = mei_cl_connect(cl, cldev->me_cl, NULL);
-	if (err < 0) {
-		mutex_unlock(&bus->device_lock);
-		dev_err(bus->dev, "Could not connect to the ME client");
-
-		return err;
+	if (!mei_me_cl_is_active(cldev->me_cl)) {
+		dev_err(&cldev->dev, "me client is not active\n");
+		ret = -ENOTTY;
+		goto out;
 	}
 
+	ret = mei_cl_connect(cl, cldev->me_cl, NULL);
+	if (ret < 0)
+		dev_err(&cldev->dev, "cannot connect\n");
+
+out:
 	mutex_unlock(&bus->device_lock);
 
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(mei_cl_enable_device);
 
@@ -349,14 +358,16 @@ EXPORT_SYMBOL_GPL(mei_cl_enable_device);
  */
 int mei_cl_disable_device(struct mei_cl_device *cldev)
 {
-	int err;
 	struct mei_device *bus;
-	struct mei_cl *cl = cldev->cl;
+	struct mei_cl *cl;
+	int err;
 
-	if (cl == NULL)
+	if (!cldev || !cldev->cl)
 		return -ENODEV;
 
-	bus = cl->dev;
+	cl = cldev->cl;
+
+	bus = cldev->bus;
 
 	cldev->event_cb = NULL;
 
@@ -369,18 +380,19 @@ int mei_cl_disable_device(struct mei_cl_device *cldev)
 	}
 
 	err = mei_cl_disconnect(cl);
-	if (err < 0) {
+	if (err < 0)
 		dev_err(bus->dev, "Could not disconnect from the ME client");
-		goto out;
-	}
 
+out:
 	/* Flush queues and remove any pending read */
 	mei_cl_flush_queues(cl, NULL);
+	mei_cl_unlink(cl);
+
+	kfree(cl);
+	cldev->cl = NULL;
 
-out:
 	mutex_unlock(&bus->device_lock);
 	return err;
-
 }
 EXPORT_SYMBOL_GPL(mei_cl_disable_device);
 
@@ -622,20 +634,6 @@ static struct device_type mei_cl_device_type = {
 	.release	= mei_cl_dev_release,
 };
 
-struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *bus,
-					 uuid_le uuid)
-{
-	struct mei_cl *cl;
-
-	list_for_each_entry(cl, &bus->device_list, device_link) {
-		if (cl->cldev && cl->cldev->me_cl &&
-		    !uuid_le_cmp(uuid, *mei_me_cl_uuid(cl->cldev->me_cl)))
-			return cl;
-	}
-
-	return NULL;
-}
-
 /**
  * mei_cl_dev_alloc - initialize and allocate mei client device
  *
@@ -706,45 +704,125 @@ static int mei_cl_bus_dev_add(struct mei_cl_device *cldev)
 	return ret;
 }
 
-struct mei_cl_device *mei_cl_add_device(struct mei_device *bus,
-					struct mei_me_client *me_cl,
-					struct mei_cl *cl,
-					const char *name)
+/**
+ * mei_cl_bus_dev_stop - stop the driver
+ *
+ * @cldev: me client device
+ */
+static void mei_cl_bus_dev_stop(struct mei_cl_device *cldev)
+{
+	if (cldev->is_added)
+		device_release_driver(&cldev->dev);
+}
+
+/**
+ * mei_cl_bus_dev_destroy - destroy me client devices object
+ *
+ * @cldev: me client device
+ */
+static void mei_cl_bus_dev_destroy(struct mei_cl_device *cldev)
+{
+	if (!cldev->is_added)
+		return;
+
+	device_del(&cldev->dev);
+
+	mutex_lock(&cldev->bus->cl_bus_lock);
+	list_del_init(&cldev->bus_list);
+	mutex_unlock(&cldev->bus->cl_bus_lock);
+
+	cldev->is_added = 0;
+	put_device(&cldev->dev);
+}
+
+/**
+ * mei_cl_bus_remove_device - remove a devices form the bus
+ *
+ * @cldev: me client device
+ */
+static void mei_cl_bus_remove_device(struct mei_cl_device *cldev)
+{
+	mei_cl_bus_dev_stop(cldev);
+	mei_cl_bus_dev_destroy(cldev);
+}
+
+/**
+ * mei_cl_bus_remove_devices - remove all devices form the bus
+ *
+ * @bus: mei device
+ */
+void mei_cl_bus_remove_devices(struct mei_device *bus)
+{
+	struct mei_cl_device *cldev, *next;
+
+	list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list)
+		mei_cl_bus_remove_device(cldev);
+}
+
+
+/**
+ * mei_cl_dev_init - allocate and initializes an mei client devices based on me client
+ *
+ * @bus: mei device
+ * @me_cl: me client
+ */
+static void mei_cl_dev_init(struct mei_device *bus, struct mei_me_client *me_cl)
 {
 	struct mei_cl_device *cldev;
-	int status;
+
+	dev_dbg(bus->dev, "initializing %pUl", mei_me_cl_uuid(me_cl));
+
+	if (me_cl->bus_added)
+		return;
 
 	cldev = mei_cl_dev_alloc(bus, me_cl);
 	if (!cldev)
-		return NULL;
+		return;
 
-	cldev->cl = cl;
-	strlcpy(cldev->name, name, sizeof(cldev->name));
+	mutex_lock(&cldev->bus->cl_bus_lock);
+	me_cl->bus_added = true;
+	list_add_tail(&cldev->bus_list, &bus->device_list);
+	mutex_unlock(&cldev->bus->cl_bus_lock);
 
-	mei_cl_dev_setup(bus, cldev);
+}
 
-	status = mei_cl_bus_dev_add(cldev);
-	if (status) {
-		dev_err(bus->dev, "Failed to register MEI device\n");
-		mei_me_cl_put(cldev->me_cl);
-		mei_dev_bus_put(bus);
-		kfree(cldev);
-		return NULL;
-	}
+/**
+ * mei_cl_bus_rescan - scan me clients list and add create devices for eligible clients
+ *
+ * @bus: mei device
+ */
+void mei_cl_bus_rescan(struct mei_device *bus)
+{
+	struct mei_cl_device *cldev, *n;
+	struct mei_me_client *me_cl;
 
-	cl->cldev = cldev;
+	down_read(&bus->me_clients_rwsem);
+	list_for_each_entry(me_cl, &bus->me_clients, list)
+		mei_cl_dev_init(bus, me_cl);
+	up_read(&bus->me_clients_rwsem);
 
-	dev_dbg(&cldev->dev, "client %s registered\n", name);
+	mutex_lock(&bus->cl_bus_lock);
+	list_for_each_entry_safe(cldev, n, &bus->device_list, bus_list) {
 
-	return cldev;
-}
-EXPORT_SYMBOL_GPL(mei_cl_add_device);
+		if (!mei_me_cl_is_active(cldev->me_cl)) {
+			mei_cl_bus_remove_device(cldev);
+			continue;
+		}
 
-void mei_cl_remove_device(struct mei_cl_device *cldev)
-{
-	device_unregister(&cldev->dev);
+		if (cldev->is_added)
+			continue;
+
+		if (mei_cl_dev_setup(bus, cldev))
+			mei_cl_bus_dev_add(cldev);
+		else {
+			list_del_init(&cldev->bus_list);
+			put_device(&cldev->dev);
+		}
+	}
+	mutex_unlock(&bus->cl_bus_lock);
+
+	dev_dbg(bus->dev, "rescan end");
 }
-EXPORT_SYMBOL_GPL(mei_cl_remove_device);
 
 int __mei_cl_driver_register(struct mei_cl_driver *cldrv, struct module *owner)
 {
@@ -772,21 +850,6 @@ void mei_cl_driver_unregister(struct mei_cl_driver *cldrv)
 }
 EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
 
-void mei_cl_bus_remove_devices(struct mei_device *bus)
-{
-	struct mei_cl *cl, *next;
-
-	mutex_lock(&bus->device_lock);
-	list_for_each_entry_safe(cl, next, &bus->device_list, device_link) {
-		if (cl->cldev)
-			mei_cl_remove_device(cl->cldev);
-
-		list_del(&cl->device_link);
-		mei_cl_unlink(cl);
-		kfree(cl);
-	}
-	mutex_unlock(&bus->device_lock);
-}
 
 int __init mei_cl_bus_init(void)
 {
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 6decbe136ea7..cb9a19340054 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -558,7 +558,6 @@ void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
 	INIT_LIST_HEAD(&cl->rd_completed);
 	INIT_LIST_HEAD(&cl->rd_pending);
 	INIT_LIST_HEAD(&cl->link);
-	INIT_LIST_HEAD(&cl->device_link);
 	cl->writing_state = MEI_IDLE;
 	cl->state = MEI_FILE_INITIALIZING;
 	cl->dev = dev;
@@ -690,16 +689,12 @@ void mei_host_client_init(struct work_struct *work)
 		mei_wd_host_init(dev, me_cl);
 	mei_me_cl_put(me_cl);
 
-	me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_guid);
-	if (me_cl)
-		mei_nfc_host_init(dev, me_cl);
-	mei_me_cl_put(me_cl);
-
-
 	dev->dev_state = MEI_DEV_ENABLED;
 	dev->reset_count = 0;
 	mutex_unlock(&dev->device_lock);
 
+	mei_cl_bus_rescan(dev);
+
 	pm_runtime_mark_last_busy(dev->dev);
 	dev_dbg(dev->dev, "rpm: autosuspend\n");
 	pm_runtime_autosuspend(dev->dev);
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index ddd355f8676c..e374661652cd 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -331,8 +331,6 @@ void mei_stop(struct mei_device *dev)
 
 	mei_cancel_work(dev);
 
-	mei_nfc_host_exit(dev);
-
 	mei_cl_bus_remove_devices(dev);
 
 	mutex_lock(&dev->device_lock);
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 7098dcaccc96..71c55f4cabb4 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -241,7 +241,6 @@ struct mei_cl_cb {
  * @rd_completed: completed read
  *
  * @cldev: device on the mei client bus
- * @device_link:  link to bus clients
  */
 struct mei_cl {
 	struct list_head link;
@@ -260,9 +259,7 @@ struct mei_cl {
 	struct list_head rd_pending;
 	struct list_head rd_completed;
 
-	/* MEI CL bus data */
 	struct mei_cl_device *cldev;
-	struct list_head device_link;
 };
 
 /** struct mei_hw_ops
@@ -329,12 +326,7 @@ struct mei_hw_ops {
 };
 
 /* MEI bus API*/
-
-struct mei_cl_device *mei_cl_add_device(struct mei_device *bus,
-					struct mei_me_client *me_cl,
-					struct mei_cl *cl,
-					const char *name);
-void mei_cl_remove_device(struct mei_cl_device *cldev);
+void mei_cl_bus_rescan(struct mei_device *bus);
 void mei_cl_dev_fixup(struct mei_cl_device *dev);
 ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
 			bool blocking);
@@ -343,7 +335,6 @@ void mei_cl_bus_rx_event(struct mei_cl *cl);
 void mei_cl_bus_remove_devices(struct mei_device *bus);
 int mei_cl_bus_init(void);
 void mei_cl_bus_exit(void);
-struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *bus, uuid_le uuid);
 
 /**
  * enum mei_pg_event - power gating transition events
-- 
2.4.3

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