Patch "mei: request async autosuspend at the end of enumeration" has been added to the 4.9-stable tree

Patch "mei: request async autosuspend at the end of enumeration" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mei: request async autosuspend at the end of enumeration

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mei-request-async-autosuspend-at-the-end-of-enumeration.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d5f8e166c25750adc147b0adf64a62a91653438a Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <alexander.usyskin@intel.com>
Date: Thu, 24 Nov 2016 13:34:02 +0200
Subject: mei: request async autosuspend at the end of enumeration

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

commit d5f8e166c25750adc147b0adf64a62a91653438a upstream.

pm_runtime_autosuspend can take synchronous or asynchronous
paths, Because we are calling pm_runtime_mark_last_busy just before
this most of the cases it takes the asynchronous way. However,
when the FW or driver resets during already running runtime suspend,
the call will result in calling to the driver's rpm callback and results
in a deadlock on device_lock.
The simplest fix is to replace pm_runtime_autosuspend with
asynchronous pm_request_autosuspend.

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>

---
 drivers/misc/mei/client.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -686,7 +686,7 @@ void mei_host_client_init(struct mei_dev
 
 	pm_runtime_mark_last_busy(dev->dev);
 	dev_dbg(dev->dev, "rpm: autosuspend\n");
-	pm_runtime_autosuspend(dev->dev);
+	pm_request_autosuspend(dev->dev);
 }
 
 /**


Patches currently in stable-queue which might be from alexander.usyskin@intel.com are

queue-4.9/mei-request-async-autosuspend-at-the-end-of-enumeration.patch
queue-4.9/mei-me-add-lewisburg-device-ids.patch