mei: me_client lookup function to return me_client object

For support of dynamic addition and removal of me clients
it is more convenient to use a list instead of static array
as is use now.
As the first step of the transition to the new data structure
we change the lookup function so it returns me client address
instead of an index.

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

1 files changed, 20 insertions, 23 deletions

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 3c5a1d328977..a20e6e9422f8 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -33,18 +33,19 @@
  *
  * Locking: called under "dev->device_lock" lock
  *
- * returns me client index or -ENOENT if not found
+ * returns me client or NULL if not found
  */
-int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *uuid)
+struct mei_me_client *mei_me_cl_by_uuid(const struct mei_device *dev,
+					const uuid_le *uuid)
 {
 	int i;
 
 	for (i = 0; i < dev->me_clients_num; ++i)
 		if (uuid_le_cmp(*uuid,
 				dev->me_clients[i].props.protocol_name) == 0)
-			return i;
+			return &dev->me_clients[i];
 
-	return -ENOENT;
+	return NULL;
 }
 
 
@@ -56,18 +57,18 @@ int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *uuid)
  *
  * Locking: called under "dev->device_lock" lock
  *
- * returns index on success, -ENOENT on failure.
+ * returns me client or NULL if not found
  */
 
-int mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
+struct mei_me_client *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)
-			return i;
+			return &dev->me_clients[i];
 
-	return -ENOENT;
+	return NULL;
 }
 
 
@@ -646,7 +647,6 @@ int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
 {
 	struct mei_device *dev;
 	struct mei_me_client *me_cl;
-	int id;
 
 	if (WARN_ON(!cl || !cl->dev))
 		return -EINVAL;
@@ -659,13 +659,12 @@ int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
 	if (cl->mei_flow_ctrl_creds > 0)
 		return 1;
 
-	id = mei_me_cl_by_id(dev, cl->me_client_id);
-	if (id < 0) {
+	me_cl = mei_me_cl_by_id(dev, cl->me_client_id);
+	if (!me_cl) {
 		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
-		return id;
+		return -ENOENT;
 	}
 
-	me_cl = &dev->me_clients[id];
 	if (me_cl->mei_flow_ctrl_creds) {
 		if (WARN_ON(me_cl->props.single_recv_buf == 0))
 			return -EINVAL;
@@ -688,21 +687,19 @@ int mei_cl_flow_ctrl_reduce(struct mei_cl *cl)
 {
 	struct mei_device *dev;
 	struct mei_me_client *me_cl;
-	int id;
 
 	if (WARN_ON(!cl || !cl->dev))
 		return -EINVAL;
 
 	dev = cl->dev;
 
-	id = mei_me_cl_by_id(dev, cl->me_client_id);
-	if (id < 0) {
+	me_cl = mei_me_cl_by_id(dev, cl->me_client_id);
+	if (!me_cl) {
 		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
-		return id;
+		return -ENOENT;
 	}
 
-	me_cl = &dev->me_clients[id];
-	if (me_cl->props.single_recv_buf != 0) {
+	if (me_cl->props.single_recv_buf) {
 		if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0))
 			return -EINVAL;
 		me_cl->mei_flow_ctrl_creds--;
@@ -725,8 +722,8 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length)
 {
 	struct mei_device *dev;
 	struct mei_cl_cb *cb;
+	struct mei_me_client *me_cl;
 	int rets;
-	int i;
 
 	if (WARN_ON(!cl || !cl->dev))
 		return -ENODEV;
@@ -740,8 +737,8 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length)
 		cl_dbg(dev, cl, "read is pending.\n");
 		return -EBUSY;
 	}
-	i = mei_me_cl_by_id(dev, cl->me_client_id);
-	if (i < 0) {
+	me_cl = mei_me_cl_by_id(dev, cl->me_client_id);
+	if (!me_cl) {
 		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
 		return  -ENOTTY;
 	}
@@ -760,7 +757,7 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length)
 	}
 
 	/* always allocate at least client max message */
-	length = max_t(size_t, length, dev->me_clients[i].props.max_msg_length);
+	length = max_t(size_t, length, me_cl->props.max_msg_length);
 	rets = mei_io_cb_alloc_resp_buf(cb, length);
 	if (rets)
 		goto out;