linux-kernel - [RFC PATCH v1] vsock: check error queue to set EPOLLERR

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Message-ID: <76e7698d-890b-d14d-fa34-da5dd7dd13d8@sberdevices.ru>
Date:   Wed, 1 Mar 2023 08:19:45 +0300
From:   Arseniy Krasnov <avkrasnov@...rdevices.ru>
To:     Stefano Garzarella <sgarzare@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     <oxffffaa@...il.com>, <kernel@...rdevices.ru>,
        <avkrasnov@...rdevices.ru>,
        <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH v1] vsock: check error queue to set EPOLLERR

EPOLLERR must be set not only when there is error on the socket, but also
when error queue of it is not empty (may be it contains some control
messages). Without this patch 'poll()' won't detect data in error queue.
This patch is based on 'tcp_poll()'.

Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
---
 net/vmw_vsock/af_vsock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 19aea7cba26e..b5e51ef4a74c 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1026,7 +1026,7 @@ static __poll_t vsock_poll(struct file *file, struct socket *sock,
 	poll_wait(file, sk_sleep(sk), wait);
 	mask = 0;
 
-	if (sk->sk_err)
+	if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
 		/* Signify that there has been an error on this socket. */
 		mask |= EPOLLERR;
 
-- 
2.25.1