1 files changed, 7 insertions, 2 deletions

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 8aaa7eec7b74..e88421d9a48d 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -164,8 +164,13 @@ static void finish_writeback_work(struct bdi_writeback *wb,
 
         if (work->auto_free)
                 kfree(work);
-        if (done && atomic_dec_and_test(&done->cnt))
-                wake_up_all(done->waitq);
+        if (done) {
+                wait_queue_head_t *waitq = done->waitq;
+
+                /* @done can't be accessed after the following dec */
+                if (atomic_dec_and_test(&done->cnt))
+                        wake_up_all(waitq);
+        }
 }
 
 static void wb_queue_work(struct bdi_writeback *wb,