btrfs: prevent RCU warning when dereferencing radix tree slot

Mark the dereference as protected by lock. Not doing so triggers
an RCU warning since the radix tree assumed that RCU is in use.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/tests/btrfs-tests.c b/fs/btrfs/tests/btrfs-tests.c
index a5dcacb5df9cc16027240549101e078c03b9220f..9626252ee6b47d2b391f3383cfa9b3bb80e4110c 100644 (file)
--- a/fs/btrfs/tests/btrfs-tests.c
+++ b/fs/btrfs/tests/btrfs-tests.c
@@ -135,7 +135,7 @@ restart:
        radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, 0) {
                struct extent_buffer *eb;
 
-               eb = radix_tree_deref_slot(slot);
+               eb = radix_tree_deref_slot_protected(slot, &fs_info->buffer_lock);
                if (!eb)
                        continue;
                /* Shouldn't happen but that kind of thinking creates CVE's */