[PATCH for-next 2/7] io_uring: hold locks for io_req_complete_failed

[Pavel Begunkov <asml.silence@gmail.com>]

A preparation patch, make sure we always hold uring_lock around
io_req_complete_failed(). The only place deviating from the rule
is io_cancel_defer_files(), queue a tw instead.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/io_uring.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 2087ada65284..a4e6866f24c8 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -861,9 +861,12 @@ inline void __io_req_complete(struct io_kiocb *req, unsigned issue_flags)
 }
 
 void io_req_complete_failed(struct io_kiocb *req, s32 res)
+	__must_hold(&ctx->uring_lock)
 {
 	const struct io_op_def *def = &io_op_defs[req->opcode];
 
+	lockdep_assert_held(&req->ctx->uring_lock);
+
 	req_set_fail(req);
 	io_req_set_res(req, res, io_put_kbuf(req, IO_URING_F_UNLOCKED));
 	if (def->fail)
@@ -1614,6 +1617,7 @@ static u32 io_get_sequence(struct io_kiocb *req)
 }
 
 static __cold void io_drain_req(struct io_kiocb *req)
+	__must_hold(&ctx->uring_lock)
 {
 	struct io_ring_ctx *ctx = req->ctx;
 	struct io_defer_entry *de;
@@ -2847,7 +2851,7 @@ static __cold bool io_cancel_defer_files(struct io_ring_ctx *ctx,
 	while (!list_empty(&list)) {
 		de = list_first_entry(&list, struct io_defer_entry, list);
 		list_del_init(&de->list);
-		io_req_complete_failed(de->req, -ECANCELED);
+		io_req_task_queue_fail(de->req, -ECANCELED);
 		kfree(de);
 	}
 	return true;
-- 
2.38.1