Skip to contentSkip to conversation

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

PATCH [email protected] 1 participant 1 message May 3, 2016

Subsystems (3)
Stable branch Char and misc drivers Intel management engine (mei)
lore
Share & tools
lore

[email protected]

author maintainer Applied
#0 lore raw

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-testing 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 be merged to the char-misc-next branch sometime soon, after it passes testing, and the merge window is open.

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;
 	}
Signature · 1 line
2.8.2