From: Pavel Begunkov <asml.silence@gmail.com>
Date: Fri, 8 Jan 2021 20:57:22 +0000 (+0000)
Subject: io_uring: io_rw_reissue lockdep annotations
X-Git-Tag: io_uring-5.11-2021-01-10~3
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=55e6ac1e1f31c7f678d9f3c8d54c6f102e5f1550;p=linux-block.git

io_uring: io_rw_reissue lockdep annotations

We expect io_rw_reissue() to take place only during submission with
uring_lock held. Add a lockdep annotation to check that invariant.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index cb57e0360fcb..55ba1922a349 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2692,6 +2692,8 @@ static bool io_rw_reissue(struct io_kiocb *req, long res)
 	if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker())
 		return false;
 
+	lockdep_assert_held(&req->ctx->uring_lock);
+
 	ret = io_sq_thread_acquire_mm_files(req->ctx, req);
 
 	if (io_resubmit_prep(req, ret)) {