[PATCH review for 4.9 43/50] mei: return error on notification request to a disconnected client

[Levin, Alexander (Sasha Levin)]

From: Alexander Usyskin <alexander.usys...@intel.com>

[ Upstream commit 7c47d2ca0feca767479329da23523ed798acb854 ]

Request for a notification from a disconnected client will be ignored
silently by the FW but the caller should know that the operation hasn't
succeeded.

Signed-off-by: Alexander Usyskin <alexander.usys...@intel.com>
Signed-off-by: Tomas Winkler <tomas.wink...@intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
---
 drivers/misc/mei/client.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index e2af61f7e3b6..451d417eb451 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -1320,6 +1320,9 @@ int mei_cl_notify_request(struct mei_cl *cl,
                return -EOPNOTSUPP;
        }
 
+       if (!mei_cl_is_connected(cl))
+               return -ENODEV;
+
        rets = pm_runtime_get(dev->dev);
        if (rets < 0 && rets != -EINPROGRESS) {
                pm_runtime_put_noidle(dev->dev);
-- 
2.11.0