linux-kernel - [char-misc-next 13/15 V3] mei: bus: blacklist clients by number of connections

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Message-Id: <1437653327-3308-14-git-send-email-tomas.winkler@intel.com>
Date:	Thu, 23 Jul 2015 15:08:45 +0300
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	arnd@...db.de, Alexander Usyskin <alexander.usyskin@...el.com>,
	linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 13/15 V3] 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@...el.com>
---
V2: a new patch in the 2nd series
V3: rebase
 drivers/misc/mei/bus-fixup.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

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),
 };
 
-- 
2.4.3

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