[PATCH 3.2 071/110] dm btree: silence lockdep lock inversion in dm_btree_del()

From: Ben Hutchings
Date: Mon Aug 10 2015 - 06:27:52 EST

3.2.71-rc1 review patch. If anyone has any objections, please let me know.


From: Joe Thornber <ejt@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
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
@@ -236,7 +236,7 @@ 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->tm = info->tm;

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