Patch "btrfs: initialize the seq counter in struct btrfs_device" has been added to the 4.4-stable tree

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

btrfs: initialize the seq counter in struct btrfs_device

to the 4.4-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:
btrfs-initialize-the-seq-counter-in-struct-btrfs_device.patch
and it can be found in the queue-4.4 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, 15 Jan 2016 14:37:15 +0100
Subject: btrfs: initialize the seq counter in struct btrfs_device

From: Sebastian Andrzej Siewior <[email protected]>

commit 546bed631203344611f42b2af1d224d2eedb4e6b upstream.

I managed to trigger this:

| INFO: trying to register non-static key.
| the code is fine but needs lockdep annotation.
| turning off the locking correctness validator.
| CPU: 1 PID: 781 Comm: systemd-gpt-aut Not tainted 4.4.0-rt2+ #14
| Hardware name: ARM-Versatile Express
| [<80307cec>] (dump_stack)
| [<80070e98>] (__lock_acquire)
| [<8007184c>] (lock_acquire)
| [<80287800>] (btrfs_ioctl)
| [<8012a8d4>] (do_vfs_ioctl)
| [<8012ac14>] (SyS_ioctl)

so I think that btrfs_device_data_ordered_init() is not invoked behind a macro somewhere.

---
 fs/btrfs/volumes.c |    1 +
 1 file changed, 1 insertion(+)

@@ -232,6 +232,7 @@ static struct btrfs_device *__alloc_devi
 	spin_lock_init(&dev->reada_lock);
 	atomic_set(&dev->reada_in_flight, 0);
 	atomic_set(&dev->dev_stats_ccnt, 0);
+	btrfs_device_data_ordered_init(dev);
 	INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
 	INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
 

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

queue-4.4/btrfs-initialize-the-seq-counter-in-struct-btrfs_device.patch