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patch "mei: bus: call mei_cl_read_start under device lock" added to char-misc-next

PATCH [email protected] 1 participant 1 message May 4, 2016

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Stable branch Char and misc drivers Intel management engine (mei)
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This is a note to let you know that I've just added the patch titled

mei: bus: call mei_cl_read_start under device lock

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-next branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release during the merge window.

If you have any questions about this process, please let me know.

Quoted 1 line

From bc46b45a421a64a0895dd41a34d3d2086e1ac7f6 Mon Sep 17 00:00:00 2001

From: Alexander Usyskin <[email protected]>
Date: Tue, 3 May 2016 18:54:21 -0400
Subject: mei: bus: call mei_cl_read_start under device lock

Ensure that mei_cl_read_start is called under the device lock also in the bus layer. The function updates global ctrl_wr_list which should be locked.

Cc <[email protected]> #4.4+
Signed-off-by Alexander Usyskin <[email protected]>
Signed-off-by Tomas Winkler <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 drivers/misc/mei/bus.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)
drivers/misc/mei/bus.c +12 -3
index bc13f5f35a19..1f33fea9299f 100644
@@ -220,17 +220,23 @@ EXPORT_SYMBOL_GPL(mei_cldev_recv);
 static void mei_cl_bus_event_work(struct work_struct *work)
 {
 	struct mei_cl_device *cldev;
+	struct mei_device *bus;
 
 	cldev = container_of(work, struct mei_cl_device, event_work);
 
+	bus = cldev->bus;
+
 	if (cldev->event_cb)
 		cldev->event_cb(cldev, cldev->events, cldev->event_context);
 
 	cldev->events = 0;
 
 	/* Prepare for the next read */
-	if (cldev->events_mask & BIT(MEI_CL_EVENT_RX))
+	if (cldev->events_mask & BIT(MEI_CL_EVENT_RX)) {
+		mutex_lock(&bus->device_lock);
 		mei_cl_read_start(cldev->cl, 0, NULL);
+		mutex_unlock(&bus->device_lock);
+	}
 }
 
 /**

@@ -304,6 +310,7 @@ int mei_cldev_register_event_cb(struct mei_cl_device *cldev,
 				unsigned long events_mask,
 				mei_cldev_event_cb_t event_cb, void *context)
 {
+	struct mei_device *bus = cldev->bus;
 	int ret;
 
 	if (cldev->event_cb)

@@ -316,15 +323,17 @@ int mei_cldev_register_event_cb(struct mei_cl_device *cldev,
 	INIT_WORK(&cldev->event_work, mei_cl_bus_event_work);
 
 	if (cldev->events_mask & BIT(MEI_CL_EVENT_RX)) {
+		mutex_lock(&bus->device_lock);
 		ret = mei_cl_read_start(cldev->cl, 0, NULL);
+		mutex_unlock(&bus->device_lock);
 		if (ret && ret != -EBUSY)
 			return ret;
 	}
 
 	if (cldev->events_mask & BIT(MEI_CL_EVENT_NOTIF)) {
-		mutex_lock(&cldev->cl->dev->device_lock);
+		mutex_lock(&bus->device_lock);
 		ret = mei_cl_notify_request(cldev->cl, NULL, event_cb ? 1 : 0);
-		mutex_unlock(&cldev->cl->dev->device_lock);
+		mutex_unlock(&bus->device_lock);
 		if (ret)
 			return ret;
 	}
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