1 files changed, 7 insertions, 2 deletions

diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 6e28000a4b21..78c299218681 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -760,8 +760,13 @@ wait_for_iobuf:
                    required. */
                 JBUFFER_TRACE(jh, "file as BJ_Forget");
                 jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget);
-                /* Wake up any transactions which were waiting for this
-                   IO to complete */
+                /*
+                 * Wake up any transactions which were waiting for this IO to
+                 * complete. The barrier must be here so that changes by
+                 * jbd2_journal_file_buffer() take effect before wake_up_bit()
+                 * does the waitqueue check.
+                 */
+                smp_mb();
                 wake_up_bit(&bh->b_state, BH_Unshadow);
                 JBUFFER_TRACE(jh, "brelse shadowed buffer");
                 __brelse(bh);