mei: reset flow control on the last client disconnection

The FW resets the flow control for single buffer clients when the last
host client disconnects, also the driver has to follow this policy and
zero the flow control counter in such case.

Cc: <stable@vger.kernel.org> #4.1
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>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 7a5a6636f0fd..d089b136f12c 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -755,6 +755,9 @@ void mei_cl_set_disconnected(struct mei_cl *cl)
         if (!WARN_ON(cl->me_cl->connect_count == 0))
                 cl->me_cl->connect_count--;
 
+        if (cl->me_cl->connect_count == 0)
+                cl->me_cl->mei_flow_ctrl_creds = 0;
+
         mei_me_cl_put(cl->me_cl);
         cl->me_cl = NULL;
 }