io_uring: remove timeout.list after hrtimer cancel

Remove timeouts from ctx->timeout_list after hrtimer_try_to_cancel()
successfully cancels it. With this we don't need to care whether there
was a race and it was removed in io_timeout_fn(), and that will be handy
for following patches.

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 09b8f2c..3ce72d4 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5301,16 +5301,10 @@ static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer)
        unsigned long flags;
 
        spin_lock_irqsave(&ctx->completion_lock, flags);
+       list_del_init(&req->timeout.list);
        atomic_set(&req->ctx->cq_timeouts,
                atomic_read(&req->ctx->cq_timeouts) + 1);
 
-       /*
-        * We could be racing with timeout deletion. If the list is empty,
-        * then timeout lookup already found it and will be handling it.
-        */
-       if (!list_empty(&req->timeout.list))
-               list_del_init(&req->timeout.list);
-
        io_cqring_fill_event(req, -ETIME);
        io_commit_cqring(ctx);
        spin_unlock_irqrestore(&ctx->completion_lock, flags);
@@ -5326,11 +5320,10 @@ static int __io_timeout_cancel(struct io_kiocb *req)
        struct io_timeout_data *io = req->async_data;
        int ret;
 
-       list_del_init(&req->timeout.list);
-
        ret = hrtimer_try_to_cancel(&io->timer);
        if (ret == -1)
                return -EALREADY;
+       list_del_init(&req->timeout.list);
 
        req_set_fail_links(req);
        req->flags |= REQ_F_COMP_LOCKED;