Patch "cpu/hotplug: Drop the device lock on error" has been added to the 4.11-stable tree

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

cpu/hotplug: Drop the device lock on error

to the 4.11-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:
cpu-hotplug-drop-the-device-lock-on-error.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Sebastian Andrzej Siewior <[email protected]>
Date: Fri, 2 Jun 2017 16:27:14 +0200
Subject: cpu/hotplug: Drop the device lock on error

From: Sebastian Andrzej Siewior <[email protected]>

commit 40da1b11f01e43aad1aa6cea64681b6125e8a2a7 upstream.

If a custom CPU target is specified and that one is not available _or_ can't be interrupted then the code returns to userland without dropping a lock as notices by lockdep:

|echo 133 > /sys/devices/system/cpu/cpu7/hotplug/target
| ================================================
| [ BUG: lock held when returning to user space! ]
| ------------------------------------------------
| bash/503 is leaving the kernel with locks still held!
| 1 lock held by bash/503:
|  #0:  (device_hotplug_lock){+.+...}, at: [<ffffffff815b5650>] lock_device_hotplug_sysfs+0x10/0x40

So release the lock then.

---
 kernel/cpu.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -1656,13 +1656,13 @@ static ssize_t write_cpuhp_target(struct
 	ret = !sp->name || sp->cant_stop ? -EINVAL : 0;
 	mutex_unlock(&cpuhp_state_mutex);
 	if (ret)
-		return ret;
+		goto out;
 
 	if (st->state < target)
 		ret = do_cpu_up(dev->id, target);
 	else
 		ret = do_cpu_down(dev->id, target);
-
+out:
 	unlock_device_hotplug();
 	return ret ? ret : count;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.11/cpu-hotplug-drop-the-device-lock-on-error.patch