[PATCH fixup] maple_tree: Fix dereference of rcu type

["Liam R. Howlett (Oracle)" <liam@infradead.org>]

When getting the slot, the rcu type of the slot needs to use
rcu_dereference_protected() to ensure no locking issues.

Signed-off-by: Liam R. Howlett (Oracle) <liam@infradead.org>
---
 lib/maple_tree.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Andrew,

Please apply this fix to "[PATCH 11/18] maple_tree: Add bulk parent set
helper" to avoid type complaints.

Thanks,
Liam

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index eb7f32081b65d..f1b9c9b32bd42 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -525,8 +525,10 @@ void mas_set_parent_slots(struct ma_state *mas, struct maple_enode *parent,
 
 	for (i = 0; i < count; i++) {
 		unsigned long pval = val | ((start_slot + i) << shift) | type;
-		struct maple_enode *child = (struct maple_enode *)slots[i];
+		struct maple_enode *child;
 
+		child = ma_enode_ptr(rcu_dereference_protected(slots[i],
+						       mt_locked(mas->tree)));
 		mte_to_node(child)->parent = ma_parent_ptr(pval);
 	}
 }
-- 
2.47.3