mei: abort waiting for notification on unsupported HW

On legacy HW, pre Skylake, the notifications are not supported,
return -EOPNOTSUPP in mei_cl_notify_get and prevent
waiting indefinitely.

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

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index ecfaef93457d9b3b2af871c21d93658437173b59..923fad39535c1e4ff242d27ad2483e032f281996 100644 (file)
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -1428,6 +1428,11 @@ int mei_cl_notify_get(struct mei_cl *cl, bool block, bool *notify_ev)
 
        dev = cl->dev;
 
+       if (!dev->hbm_f_ev_supported) {
+               cl_dbg(dev, cl, "notifications not supported\n");
+               return -EOPNOTSUPP;
+       }
+
        if (!mei_cl_is_connected(cl))
                return -ENODEV;