linux-kernel - [char-misc-next v2 9/9] mei: amthif: fix deadlock in initialization during a reset

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Date:	Tue, 26 Jul 2016 01:06:09 +0300
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alexander Usyskin <alexander.usyskin@...el.com>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org#4.6+,
	Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next v2 9/9] mei: amthif: fix deadlock in initialization during a reset

From: Alexander Usyskin <alexander.usyskin@...el.com>

The device lock was unnecessary obtained in bus rescan work before the
amthif client search.  That causes incorrect lock ordering and task
hang:
...
[88004.613213] INFO: task kworker/1:14:21832 blocked for more than 120 seconds.
...
[88004.645934] Workqueue: events mei_cl_bus_rescan_work
...

The correct lock order is
 cl_bus_lock
  device_lock
   me_clients_rwsem

Move device_lock into amthif init function that called
after me_clients_rwsem is released.

This fixes regression introduced by commit:
commit 025fb792bac3 ("mei: split amthif client init from end of clients enumeration")

Cc: <stable@...r.kernel.org> # 4.6+
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
V2: new in the seriese

 drivers/misc/mei/amthif.c | 12 +++++++++---
 drivers/misc/mei/bus.c    |  2 --
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index 2222b60e9208..082462ea90c9 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -66,8 +66,12 @@ int mei_amthif_host_init(struct mei_device *dev, struct mei_me_client *me_cl)
 	struct mei_cl *cl = &dev->iamthif_cl;
 	int ret;
 
-	if (mei_cl_is_connected(cl))
-		return 0;
+	mutex_lock(&dev->device_lock);
+
+	if (mei_cl_is_connected(cl)) {
+		ret = 0;
+		goto out;
+	}
 
 	dev->iamthif_state = MEI_IAMTHIF_IDLE;
 
@@ -76,11 +80,13 @@ int mei_amthif_host_init(struct mei_device *dev, struct mei_me_client *me_cl)
 	ret = mei_cl_link(cl);
 	if (ret < 0) {
 		dev_err(dev->dev, "amthif: failed cl_link %d\n", ret);
-		return ret;
+		goto out;
 	}
 
 	ret = mei_cl_connect(cl, me_cl, NULL);
 
+out:
+	mutex_unlock(&dev->device_lock);
 	return ret;
 }
 
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index cdf13f6d2697..8cac7ef9ad0d 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -984,12 +984,10 @@ void mei_cl_bus_rescan_work(struct work_struct *work)
 		container_of(work, struct mei_device, bus_rescan_work);
 	struct mei_me_client *me_cl;
 
-	mutex_lock(&bus->device_lock);
 	me_cl = mei_me_cl_by_uuid(bus, &mei_amthif_guid);
 	if (me_cl)
 		mei_amthif_host_init(bus, me_cl);
 	mei_me_cl_put(me_cl);
-	mutex_unlock(&bus->device_lock);
 
 	mei_cl_bus_rescan(bus);
 }
-- 
2.7.4