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-Url: https://git.stricted.de/?a=commitdiff_plain;h=47af854f2ad3d458238a5dedc747415dc218e8c8;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

dm btree: silence lockdep lock inversion in dm_btree_del()

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>
---

diff --git a/drivers/md/persistent-data/dm-btree.c b/drivers/md/persistent-data/dm-btree.c
index 0a7592e8881..e3ecb0b824b 100644
--- a/drivers/md/persistent-data/dm-btree.c
+++ b/drivers/md/persistent-data/dm-btree.c
@@ -240,7 +240,7 @@ 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->tm = info->tm;