From: Joe Thornber <ejt@redhat.com>
Date: Fri, 3 Jul 2015 13:51:32 +0000 (+0100)
Subject: dm btree: silence lockdep lock inversion in dm_btree_del()
X-Git-Tag: v4.9.8~3890^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1c7518794a3647eb345d59ee52844e8a40405198;p=platform%2Fkernel%2Flinux-rpi3.git

dm btree: silence lockdep lock inversion in dm_btree_del()

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>
Cc: stable@vger.kernel.org
---

diff --git a/drivers/md/persistent-data/dm-btree.c b/drivers/md/persistent-data/dm-btree.c
index 200ac12..fdd3793 100644
--- 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 *info, dm_block_t root)
 	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;