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

On Thu, Nov 25, 2021 at 12:02:06PM +0100, Karsten Graul wrote:

On 25/11/2021 07:19, Tony Lu wrote:

quoted

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.

Sorry for that, I will fix it in the next patch.

quoted

 
 	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?

I agree with you, I'd like bool condition rather than goto, which will
disturb the continuity of reading code.

I will fix it soon. Thank you.

Tony Lu

quoted

 		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