mei: add reference counting for me clients
To support dynamic addition and removal of
me clients we add reference counter.
Update kdoc with locking requirements.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 239d7f5..c8412d4 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -105,21 +105,6 @@
}
/**
- * mei_me_cl_remove_all - remove all me clients
- *
- * @dev: the device structure
- */
-static void mei_me_cl_remove_all(struct mei_device *dev)
-{
- struct mei_me_client *me_cl, *next;
-
- list_for_each_entry_safe(me_cl, next, &dev->me_clients, list) {
- list_del(&me_cl->list);
- kfree(me_cl);
- }
-}
-
-/**
* mei_hbm_reset - reset hbm counters and book keeping data structurs
*
* @dev: the device structure
@@ -128,7 +113,7 @@
{
dev->me_client_index = 0;
- mei_me_cl_remove_all(dev);
+ mei_me_cl_rm_all(dev);
mei_hbm_idle(dev);
}
@@ -339,11 +324,16 @@
struct hbm_props_response *res)
{
struct mei_me_client *me_cl;
+ const uuid_le *uuid = &res->client_properties.protocol_name;
+
+ mei_me_cl_rm_by_uuid(dev, uuid);
me_cl = kzalloc(sizeof(struct mei_me_client), GFP_KERNEL);
if (!me_cl)
return -ENOMEM;
+ mei_me_cl_init(me_cl);
+
me_cl->props = res->client_properties;
me_cl->client_id = res->me_addr;
me_cl->mei_flow_ctrl_creds = 0;
@@ -484,6 +474,7 @@
struct hbm_flow_control *flow)
{
struct mei_me_client *me_cl;
+ int rets;
me_cl = mei_me_cl_by_id(dev, flow->me_addr);
if (!me_cl) {
@@ -492,14 +483,19 @@
return -ENOENT;
}
- if (WARN_ON(me_cl->props.single_recv_buf == 0))
- return -EINVAL;
+ if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
+ rets = -EINVAL;
+ goto out;
+ }
me_cl->mei_flow_ctrl_creds++;
dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
flow->me_addr, me_cl->mei_flow_ctrl_creds);
- return 0;
+ rets = 0;
+out:
+ mei_me_cl_put(me_cl);
+ return rets;
}
/**