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-rw-r--r--fs/fs-writeback.c9
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,