1 files changed, 4 insertions, 1 deletions

diff --git a/fs/btrfs/hash.c b/fs/btrfs/hash.c
index a97fdc156a03..baacc1866861 100644
--- a/fs/btrfs/hash.c
+++ b/fs/btrfs/hash.c
@@ -38,6 +38,7 @@ u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
 {
         SHASH_DESC_ON_STACK(shash, tfm);
         u32 *ctx = (u32 *)shash_desc_ctx(shash);
+        u32 retval;
         int err;
 
         shash->tfm = tfm;
@@ -47,5 +48,7 @@ u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length)
         err = crypto_shash_update(shash, address, length);
         BUG_ON(err);
 
-        return *ctx;
+        retval = *ctx;
+        barrier_data(ctx);
+        return retval;
 }