netdev - Re: [PATCH net 1/2] RDS: TCP: rds_tcp_accept_worker() must exit gracefully when terminating rds-tcp

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Message-ID: <1b519ce2-89f2-3b98-e00b-73d453e1e53e@oracle.com>
Date:	Wed, 18 May 2016 11:33:19 -0700
From:	Santosh Shilimkar <santosh.shilimkar@...cle.com>
To:	Sowmini Varadhan <sowmini.varadhan@...cle.com>,
	netdev@...r.kernel.org
Cc:	davem@...emloft.net, rds-devel@....oracle.com,
	ajaykumar.hotchandani@...cle.com
Subject: Re: [PATCH net 1/2] RDS: TCP: rds_tcp_accept_worker() must exit
 gracefully when terminating rds-tcp

On 5/18/2016 10:06 AM, Sowmini Varadhan wrote:
> There are two instances where we want to terminate RDS-TCP: when
> exiting the netns or during module unload. In either case, the
> termination sequence is to stop the listen socket, mark the
> rtn->rds_tcp_listen_sock as null, and flush any accept workqs.
> Thus any workqs that get flushed at this point will encounter a
> null rds_tcp_listen_sock, and must exit gracefully to allow
> the RDS-TCP termination to complete successfully.
>
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
> ---
>  net/rds/tcp_listen.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/net/rds/tcp_listen.c b/net/rds/tcp_listen.c
> index be263cd..e10b422 100644
> --- a/net/rds/tcp_listen.c
> +++ b/net/rds/tcp_listen.c
> @@ -80,6 +80,9 @@ int rds_tcp_accept_one(struct socket *sock)
>  	int conn_state;
>  	struct sock *nsk;
>
> +	if (!sock) /* module unload or netns delete in progress */
> +		return -ENETUNREACH;
> +
New error code type in RDS but seems appropriate :-)
Patch looks good to me.
Acked-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>