mei: bus: blacklist clients by number of connections

Currently we support only clients with single connection
and fixed address clients so all other clients are blacklisted

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

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index 696918a6fa4f..fd6470f42671 100644
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -33,6 +33,24 @@
 #define MEI_UUID_ANY NULL_UUID_LE
 
 /**
+ * number_of_connections - determine whether an client be on the bus
+ *    according number of connections
+ *    We support only clients:
+ *       1. with single connection
+ *       2. and fixed clients (max_number_of_connections == 0)
+ *
+ * @cldev: me clients device
+ */
+static void number_of_connections(struct mei_cl_device *cldev)
+{
+        dev_dbg(&cldev->dev, "running hook %s on %pUl\n",
+                        __func__, mei_me_cl_uuid(cldev->me_cl));
+
+        if (cldev->me_cl->props.max_number_of_connections > 1)
+                cldev->do_match = 0;
+}
+
+/**
  * blacklist - blacklist a client from the bus
  *
  * @cldev: me clients device
@@ -435,6 +453,7 @@ static struct mei_fixup {
         const uuid_le uuid;
         void (*hook)(struct mei_cl_device *cldev);
 } mei_fixups[] = {
+        MEI_FIXUP(MEI_UUID_ANY, number_of_connections),
         MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
 };