From: Alexander Usyskin <alexander.usyskin@intel.com>
Date: Sat, 7 Oct 2017 22:37:48 +0000 (+0000)
Subject: mei: return error on notification request to a disconnected client
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=45a012ace954efc08670fd6cd5698facbcdb119c;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

mei: return error on notification request to a disconnected client


[ 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.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.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 2ff39fbc70d1..df268365e04e 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -1300,6 +1300,9 @@ int mei_cl_notify_request(struct mei_cl *cl, struct file *file, u8 request)
 		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);