[PATCH 3.16.y-ckt 030/118] dm btree: silence lockdep lock inversion in dm_btree_del()

From: Luis Henriques
Date: Wed Aug 12 2015 - 05:36:20 EST

3.16.7-ckt16 -stable 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: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
drivers/md/persistent-data/dm-btree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/persistent-data/dm-btree.c b/drivers/md/persistent-data/dm-btree.c
index 200ac12a1d40..fdd3793e22f9 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;
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