1 files changed, 5 insertions, 1 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 35c57074a376..43d23148a4fe 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -221,7 +221,9 @@ int btrfs_cow_block(struct btrfs_trans_handle *trans,
                     struct extent_buffer **cow_ret)
 {
         u64 search_start;
+        u64 header_trans;
         int ret;
+
         if (trans->transaction != root->fs_info->running_transaction) {
                 printk(KERN_CRIT "trans %Lu running %Lu\n", trans->transid,
                        root->fs_info->running_transaction->transid);
@@ -232,7 +234,9 @@ int btrfs_cow_block(struct btrfs_trans_handle *trans,
                        root->fs_info->generation);
                 WARN_ON(1);
         }
-        if (btrfs_header_generation(buf) == trans->transid) {
+
+        header_trans = btrfs_header_generation(buf);
+        if (header_trans == trans->transid) {
                 *cow_ret = buf;
                 return 0;
         }