mei: revamp me client search function

me client search functions returns index
into me_client array according me client id
or me client uuid.

1. Add common prefix for the functions mei_me_cl_<>
2. create new function mei_me_cl_by_id that wraps open
 coded loops scattered over the code
3. rename mei_find_me_client_index to  mei_me_cl_by_uuid
4. rename mei_find_me_client_update_filext  to
 mei_me_cl_update_filext and updates its parameter names

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/init.c

@@ -522,12 +522,12 @@ void mei_cl_init(struct mei_cl *priv, struct mei_device *dev)
 	priv->dev = dev;
 }
 
-int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid)
+int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *cuuid)
 {
-	int i, res = -1;
+	int i, res = -ENOENT;
 
 	for (i = 0; i < dev->me_clients_num; ++i)
-		if (uuid_le_cmp(cuuid,
+		if (uuid_le_cmp(*cuuid,
 				dev->me_clients[i].props.protocol_name) == 0) {
 			res = i;
 			break;
@@ -538,35 +538,35 @@ int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid)
 
 
 /**
- * mei_find_me_client_update_filext - searches for ME client guid
+ * mei_me_cl_update_filext - searches for ME client guid
  *                       sets client_id in mei_file_private if found
  * @dev: the device structure
- * @priv: private file structure to set client_id in
- * @cguid: searched guid of ME client
+ * @cl: private file structure to set client_id in
+ * @cuuid: searched uuid of ME client
  * @client_id: id of host client to be set in file private structure
  *
  * returns ME client index
  */
-u8 mei_find_me_client_update_filext(struct mei_device *dev, struct mei_cl *priv,
-				const uuid_le *cguid, u8 client_id)
+int mei_me_cl_update_filext(struct mei_device *dev, struct mei_cl *cl,
+				const uuid_le *cuuid, u8 host_cl_id)
 {
 	int i;
 
-	if (!dev || !priv || !cguid)
-		return 0;
+	if (!dev || !cl || !cuuid)
+		return -EINVAL;
 
 	/* check for valid client id */
-	i = mei_find_me_client_index(dev, *cguid);
+	i = mei_me_cl_by_uuid(dev, cuuid);
 	if (i >= 0) {
-		priv->me_client_id = dev->me_clients[i].client_id;
-		priv->state = MEI_FILE_CONNECTING;
-		priv->host_client_id = client_id;
+		cl->me_client_id = dev->me_clients[i].client_id;
+		cl->state = MEI_FILE_CONNECTING;
+		cl->host_client_id = host_cl_id;
 
-		list_add_tail(&priv->link, &dev->file_list);
+		list_add_tail(&cl->link, &dev->file_list);
 		return (u8)i;
 	}
 
-	return 0;
+	return -ENOENT;
 }
 
 /**
@@ -577,16 +577,16 @@ u8 mei_find_me_client_update_filext(struct mei_device *dev, struct mei_cl *priv,
  */
 void mei_host_init_iamthif(struct mei_device *dev)
 {
-	u8 i;
+	int i;
 	unsigned char *msg_buf;
 
 	mei_cl_init(&dev->iamthif_cl, dev);
 	dev->iamthif_cl.state = MEI_FILE_DISCONNECTED;
 
 	/* find ME amthi client */
-	i = mei_find_me_client_update_filext(dev, &dev->iamthif_cl,
+	i = mei_me_cl_update_filext(dev, &dev->iamthif_cl,
 			    &mei_amthi_guid, MEI_IAMTHIF_HOST_CLIENT_ID);
-	if (dev->iamthif_cl.state != MEI_FILE_CONNECTING) {
+	if (i < 0) {
 		dev_dbg(&dev->pdev->dev, "failed to find iamthif client.\n");
 		return;
 	}

drivers/misc/mei/iorw.c

@@ -38,7 +38,31 @@
 #include <linux/mei.h>
 #include "interface.h"
 
+/**
+ * mei_me_cl_by_id return index to me_clients for client_id
+ *
+ * @dev: the device structure
+ * @client_id: me client id
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * returns index on success, -ENOENT on failure.
+ */
 
+int mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
+{
+	int i;
+	for (i = 0; i < dev->me_clients_num; i++)
+		if (dev->me_clients[i].client_id == client_id)
+			break;
+	if (WARN_ON(dev->me_clients[i].client_id != client_id))
+		return -ENOENT;
+
+	if (i == dev->me_clients_num)
+		return -ENOENT;
+
+	return i;
+}
 
 /**
  * mei_ioctl_connect_client - the connect to fw client IOCTL function
@@ -95,7 +119,7 @@ int mei_ioctl_connect_client(struct file *file,
 	}
 
 	/* find ME client we're trying to connect to */
-	i = mei_find_me_client_index(dev, data->in_client_uuid);
+	i = mei_me_cl_by_uuid(dev, &data->in_client_uuid);
 	if (i >= 0 && !dev->me_clients[i].props.fixed_address) {
 		cl->me_client_id = dev->me_clients[i].client_id;
 		cl->state = MEI_FILE_CONNECTING;
@@ -273,19 +297,12 @@ int amthi_read(struct mei_device *dev, struct file *file,
 		return -ETIMEDOUT;
 	}
 
-	for (i = 0; i < dev->me_clients_num; i++) {
-		if (dev->me_clients[i].client_id ==
-		    dev->iamthif_cl.me_client_id)
-			break;
-	}
+	i = mei_me_cl_by_id(dev, dev->iamthif_cl.me_client_id);
 
-	if (i == dev->me_clients_num) {
+	if (i < 0) {
 		dev_dbg(&dev->pdev->dev, "amthi client not found.\n");
 		return -ENODEV;
 	}
-	if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id))
-		return -ENODEV;
-
 	dev_dbg(&dev->pdev->dev, "checking amthi data\n");
 	cb = find_amthi_read_list_entry(dev, file);
 
@@ -316,8 +333,7 @@ int amthi_read(struct mei_device *dev, struct file *file,
 	dev->iamthif_timer = 0;
 
 	if (cb) {
-		timeout = cb->read_time +
-					msecs_to_jiffies(IAMTHIF_READ_TIMER);
+		timeout = cb->read_time + msecs_to_jiffies(IAMTHIF_READ_TIMER);
 		dev_dbg(&dev->pdev->dev, "amthi timeout = %lud\n",
 				timeout);
 
@@ -401,19 +417,8 @@ int mei_start_read(struct mei_device *dev, struct mei_cl *cl)
 
 	dev_dbg(&dev->pdev->dev, "allocation call back successful. host client = %d, ME client = %d\n",
 		cl->host_client_id, cl->me_client_id);
-
-	for (i = 0; i < dev->me_clients_num; i++) {
-		if (dev->me_clients[i].client_id == cl->me_client_id)
-			break;
-
-	}
-
-	if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) {
-		rets = -ENODEV;
-		goto unlock;
-	}
-
-	if (i == dev->me_clients_num) {
+	i = mei_me_cl_by_id(dev, cl->me_client_id);
+	if (i < 0) {
 		rets = -ENODEV;
 		goto unlock;
 	}

drivers/misc/mei/main.c

@@ -393,10 +393,9 @@ static ssize_t mei_read(struct file *file, char __user *ubuf,
 
 	if ((cl->sm_state & MEI_WD_STATE_INDEPENDENCE_MSG_SENT) == 0) {
 		/* Do not allow to read watchdog client */
-		i = mei_find_me_client_index(dev, mei_wd_guid);
+		i = mei_me_cl_by_uuid(dev, &mei_wd_guid);
 		if (i >= 0) {
 			struct mei_me_client *me_client = &dev->me_clients[i];
-
 			if (cl->me_client_id == me_client->client_id) {
 				rets = -EBADF;
 				goto out;
@@ -620,22 +619,12 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
 			rets = -ENODEV;
 			goto unlock_dev;
 		}
-		for (i = 0; i < dev->me_clients_num; i++) {
-			if (dev->me_clients[i].client_id ==
-				dev->iamthif_cl.me_client_id)
-				break;
-		}
-
-		if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) {
+		i = mei_me_cl_by_id(dev, dev->iamthif_cl.me_client_id);
+		if (i < 0) {
 			rets = -ENODEV;
 			goto unlock_dev;
 		}
-		if (i == dev->me_clients_num ||
-		    (dev->me_clients[i].client_id !=
-		      dev->iamthif_cl.me_client_id)) {
-			rets = -ENODEV;
-			goto unlock_dev;
-		} else if (length > dev->me_clients[i].props.max_msg_length ||
+		if (length > dev->me_clients[i].props.max_msg_length ||
 			   length <= 0) {
 			rets = -EMSGSIZE;
 			goto unlock_dev;
@@ -688,16 +677,8 @@ static ssize_t mei_write(struct file *file, const char __user *ubuf,
 		    cl->me_client_id);
 		goto unlock_dev;
 	}
-	for (i = 0; i < dev->me_clients_num; i++) {
-		if (dev->me_clients[i].client_id ==
-		    cl->me_client_id)
-			break;
-	}
-	if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) {
-		rets = -ENODEV;
-		goto unlock_dev;
-	}
-	if (i == dev->me_clients_num) {
+	i = mei_me_cl_by_id(dev, cl->me_client_id);
+	if (i < 0) {
 		rets = -ENODEV;
 		goto unlock_dev;
 	}

drivers/misc/mei/mei_dev.h

@@ -279,9 +279,10 @@ void mei_host_init_iamthif(struct mei_device *dev);
 void mei_allocate_me_clients_storage(struct mei_device *dev);
 
 
-u8 mei_find_me_client_update_filext(struct mei_device *dev,
-				struct mei_cl *priv,
-				const uuid_le *cguid, u8 client_id);
+int mei_me_cl_update_filext(struct mei_device *dev, struct mei_cl *cl,
+			const uuid_le *cguid, u8 host_client_id);
+int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *cuuid);
+int mei_me_cl_by_id(struct mei_device *dev, u8 client_id);
 
 /*
  * MEI IO List Functions
@@ -348,7 +349,6 @@ void mei_run_next_iamthif_cmd(struct mei_device *dev);
 
 void mei_free_cb_private(struct mei_cl_cb *priv_cb);
 
-int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid);
 
 /*
  * Register Access Function

drivers/misc/mei/wd.c

@@ -69,7 +69,7 @@ int mei_wd_host_init(struct mei_device *dev)
 	dev->wd_timeout = AMT_WD_DEFAULT_TIMEOUT;
 
 	/* find ME WD client */
-	mei_find_me_client_update_filext(dev, &dev->wd_cl,
+	mei_me_cl_update_filext(dev, &dev->wd_cl,
 				&mei_wd_guid, MEI_WD_HOST_CLIENT_ID);
 
 	dev_dbg(&dev->pdev->dev, "wd: check client\n");