netdev - Re: [PATCH net 2/2] net/smc: Don't call clcsock shutdown twice when smc shutdown

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Date:   Thu, 25 Nov 2021 12:02:06 +0100
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     Tony Lu <tonylu@...ux.alibaba.com>
Cc:     kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH net 2/2] net/smc: Don't call clcsock shutdown twice when
 smc shutdown

On 25/11/2021 07:19, Tony Lu wrote:
> diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
> index 4b62c925a13e..7b04cb4d15f4 100644
> --- a/net/smc/af_smc.c
> +++ b/net/smc/af_smc.c
> @@ -2373,6 +2373,7 @@ static int smc_shutdown(struct socket *sock, int how)
>  	struct smc_sock *smc;
>  	int rc = -EINVAL;
>  	int rc1 = 0;
> +	int old_state;

Reverse Christmas tree formatting, please.

>  
>  	smc = smc_sk(sk);
>  
> @@ -2398,7 +2399,12 @@ static int smc_shutdown(struct socket *sock, int how)
>  	}
>  	switch (how) {
>  	case SHUT_RDWR:		/* shutdown in both directions */
> +		old_state = sk->sk_state;
>  		rc = smc_close_active(smc);
> +		if (old_state == SMC_ACTIVE &&
> +		    sk->sk_state == SMC_PEERCLOSEWAIT1)
> +			goto out_no_shutdown;
> +

I would prefer a new "bool do_shutdown" instead of a goto for this skip
of the shutdown. What do you think?

>  		break;
>  	case SHUT_WR:
>  		rc = smc_close_shutdown_write(smc);
> @@ -2410,6 +2416,8 @@ static int smc_shutdown(struct socket *sock, int how)
>  	}
>  	if (smc->clcsock)
>  		rc1 = kernel_sock_shutdown(smc->clcsock, how);
> +
> +out_no_shutdown:
>  	/* map sock_shutdown_cmd constants to sk_shutdown value range */
>  	sk->sk_shutdown |= how + 1;
>  
> 

-- 
Karsten