linux-kernel - [char-misc-next 18/18] mei: bus: call device disable handler prior to disconnection

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Date:	Tue, 10 Feb 2015 10:39:47 +0200
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	gregkh@...uxfoundation.org
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org,
	Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 18/18] mei: bus: call device disable handler prior to disconnection

call device's disable handler prior to disconnection
so it can possibly close the communication with fw client
in graceful way

Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
 drivers/misc/mei/bus.c | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 17ca7e20fb6a..45896f95fed1 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -467,37 +467,34 @@ int mei_cl_disable_device(struct mei_cl_device *device)
 
 	dev = cl->dev;
 
+	if (device->ops && device->ops->disable)
+		device->ops->disable(device);
+
+	device->event_cb = NULL;
+
 	mutex_lock(&dev->device_lock);
 
 	if (cl->state != MEI_FILE_CONNECTED) {
-		mutex_unlock(&dev->device_lock);
 		dev_err(dev->dev, "Already disconnected");
-
-		return 0;
+		err = 0;
+		goto out;
 	}
 
 	cl->state = MEI_FILE_DISCONNECTING;
 
 	err = mei_cl_disconnect(cl);
 	if (err < 0) {
-		mutex_unlock(&dev->device_lock);
-		dev_err(dev->dev,
-			"Could not disconnect from the ME client");
-
-		return err;
+		dev_err(dev->dev, "Could not disconnect from the ME client");
+		goto out;
 	}
 
 	/* Flush queues and remove any pending read */
 	mei_cl_flush_queues(cl, NULL);
 
-	device->event_cb = NULL;
-
+out:
 	mutex_unlock(&dev->device_lock);
+	return err;
 
-	if (!device->ops || !device->ops->disable)
-		return 0;
-
-	return device->ops->disable(device);
 }
 EXPORT_SYMBOL_GPL(mei_cl_disable_device);
 
-- 
1.9.3

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