io_uring: update sq_thread_idle after ctx deleted

we shall update sq_thread_idle anytime we do ctx deletion from ctx_list

Fixes:734551df ("io_uring: fix shared sqpoll cancellation hangs")
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Link: https://lore.kernel.org/r/1619256380-236460-1-git-send-email-haoxu@linux.alibaba.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -9018,6 +9018,7 @@ static void io_sqpoll_cancel_cb(struct callback_head *cb)
 	if (sqd->thread)
 		io_uring_cancel_sqpoll(sqd);
 	list_del_init(&work->ctx->sqd_list);
+	io_sqd_update_thread_idle(sqd);
 	complete(&work->completion);
 }
 
@@ -9028,7 +9029,6 @@ static void io_sqpoll_cancel_sync(struct io_ring_ctx *ctx)
 	struct task_struct *task;
 
 	io_sq_thread_park(sqd);
-	io_sqd_update_thread_idle(sqd);
 	task = sqd->thread;
 	if (task) {
 		init_completion(&work.completion);
@@ -9037,6 +9037,7 @@ static void io_sqpoll_cancel_sync(struct io_ring_ctx *ctx)
 		wake_up_process(task);
 	} else {
 		list_del_init(&ctx->sqd_list);
+		io_sqd_update_thread_idle(sqd);
 	}
 	io_sq_thread_unpark(sqd);