Patch "dm btree: silence lockdep lock inversion in dm_btree_del()" has been added to the 4.1-stable tree

Patch "dm btree: silence lockdep lock inversion in dm_btree_del()" has been added to the 4.1-stable tree

[gregkh]

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

    dm btree: silence lockdep lock inversion in dm_btree_del()

to the 4.1-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:
     dm-btree-silence-lockdep-lock-inversion-in-dm_btree_del.patch
and it can be found in the queue-4.1 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 1c7518794a3647eb345d59ee52844e8a40405198 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Fri, 3 Jul 2015 14:51:32 +0100
Subject: dm btree: silence lockdep lock inversion in dm_btree_del()

From: Joe Thornber <ejt@redhat.com>

commit 1c7518794a3647eb345d59ee52844e8a40405198 upstream.

Allocate memory using GFP_NOIO when deleting a btree.  dm_btree_del()
can be called via an ioctl and we don't want to recurse into the FS or
block layer.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/persistent-data/dm-btree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/persistent-data/dm-btree.c
+++ b/drivers/md/persistent-data/dm-btree.c
@@ -255,7 +255,7 @@ int dm_btree_del(struct dm_btree_info *i
 	int r;
 	struct del_stack *s;
 
-	s = kmalloc(sizeof(*s), GFP_KERNEL);
+	s = kmalloc(sizeof(*s), GFP_NOIO);
 	if (!s)
 		return -ENOMEM;
 	s->info = info;


Patches currently in stable-queue which might be from ejt@redhat.com are

queue-4.1/dm-btree-remove-fix-bug-in-redistribute3.patch
queue-4.1/dm-btree-silence-lockdep-lock-inversion-in-dm_btree_del.patch
queue-4.1/dm-cache-fix-race-when-issuing-a-policy_replace-operation.patch
queue-4.1/dm-thin-allocate-the-cell_sort_array-dynamically.patch
queue-4.1/dm-space-map-metadata-fix-occasional-leak-of-a-metadata-block-on-resize.patch