io_uring/net: make POLL_FIRST receive side checks consistent

io_recv() and io_recvzc() are the odd ones out, as they checks for
whether POLL_FIRST should be honored before checking if the file is a
socket. It doesn't really matter, but might as well make it consistent
across all receive and send types.

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

Author: axboe

io_uring/net.c

@@ -1216,14 +1216,14 @@ int io_recv(struct io_kiocb *req, unsigned int issue_flags)
 	bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
 	bool mshot_finished;
 
-	if (!(req->flags & REQ_F_POLLED) &&
-	    (sr->flags & IORING_RECVSEND_POLL_FIRST))
-		return -EAGAIN;
-
 	sock = sock_from_file(req->file);
 	if (unlikely(!sock))
 		return -ENOTSOCK;
 
+	if (!(req->flags & REQ_F_POLLED) &&
+	    (sr->flags & IORING_RECVSEND_POLL_FIRST))
+		return -EAGAIN;
+
 	flags = sr->msg_flags;
 	if (force_nonblock)
 		flags |= MSG_DONTWAIT;
@@ -1328,14 +1328,14 @@ int io_recvzc(struct io_kiocb *req, unsigned int issue_flags)
 	unsigned int len;
 	int ret;
 
-	if (!(req->flags & REQ_F_POLLED) &&
-	    (zc->flags & IORING_RECVSEND_POLL_FIRST))
-		return -EAGAIN;
-
 	sock = sock_from_file(req->file);
 	if (unlikely(!sock))
 		return -ENOTSOCK;
 
+	if (!(req->flags & REQ_F_POLLED) &&
+	    (zc->flags & IORING_RECVSEND_POLL_FIRST))
+		return -EAGAIN;
+
 	len = zc->len;
 	ret = io_zcrx_recv(req, zc->ifq, sock, 0, issue_flags, &zc->len);
 	if (len && zc->len == 0) {