io_uring/waitid: use generic io_cancel_remove() helper

Don't implement our own loop rolling and checking, just use the generic
helper to find and cancel requests.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/waitid.c

@@ -158,29 +158,7 @@ static bool __io_waitid_cancel(struct io_kiocb *req)
 int io_waitid_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
 		     unsigned int issue_flags)
 {
-	struct hlist_node *tmp;
-	struct io_kiocb *req;
-	int nr = 0;
-
-	if (cd->flags & (IORING_ASYNC_CANCEL_FD|IORING_ASYNC_CANCEL_FD_FIXED))
-		return -ENOENT;
-
-	io_ring_submit_lock(ctx, issue_flags);
-	hlist_for_each_entry_safe(req, tmp, &ctx->waitid_list, hash_node) {
-		if (req->cqe.user_data != cd->data &&
-		    !(cd->flags & IORING_ASYNC_CANCEL_ANY))
-			continue;
-		if (__io_waitid_cancel(req))
-			nr++;
-		if (!(cd->flags & IORING_ASYNC_CANCEL_ALL))
-			break;
-	}
-	io_ring_submit_unlock(ctx, issue_flags);
-
-	if (nr)
-		return nr;
-
-	return -ENOENT;
+	return io_cancel_remove(ctx, cd, issue_flags, &ctx->waitid_list, __io_waitid_cancel);
 }
 
 bool io_waitid_remove_all(struct io_ring_ctx *ctx, struct io_uring_task *tctx,