* [PATCH net v3] net/smc: Don't call clcsock shutdown twice when smc shutdown
@ 2021-11-26 2:41 Tony Lu
2021-11-26 9:04 ` Karsten Graul
2021-11-26 19:40 ` patchwork-bot+netdevbpf
0 siblings, 2 replies; 3+ messages in thread
From: Tony Lu @ 2021-11-26 2:41 UTC (permalink / raw)
To: kgraul; +Cc: kuba, davem, netdev, linux-s390, linux-rdma
When applications call shutdown() with SHUT_RDWR in userspace,
smc_close_active() calls kernel_sock_shutdown(), and it is called
twice in smc_shutdown().
This fixes this by checking sk_state before do clcsock shutdown, and
avoids missing the application's call of smc_shutdown().
Link: https://lore.kernel.org/linux-s390/1f67548e-cbf6-0dce-82b5-10288a4583bd@linux.ibm.com/
Fixes: 606a63c9783a ("net/smc: Ensure the active closing peer first closes clcsock")
Signed-off-by: Tony Lu <tonylu@linux.alibaba.com>
Reviewed-by: Wen Gu <guwen@linux.alibaba.com>
---
changes:
v2->v3:
- code format
v1->v2:
- code format
- use bool do_shutdown
---
net/smc/af_smc.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 4b62c925a13e..230072f9ec48 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -2370,8 +2370,10 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
static int smc_shutdown(struct socket *sock, int how)
{
struct sock *sk = sock->sk;
+ bool do_shutdown = true;
struct smc_sock *smc;
int rc = -EINVAL;
+ int old_state;
int rc1 = 0;
smc = smc_sk(sk);
@@ -2398,7 +2400,11 @@ 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)
+ do_shutdown = false;
break;
case SHUT_WR:
rc = smc_close_shutdown_write(smc);
@@ -2408,7 +2414,7 @@ static int smc_shutdown(struct socket *sock, int how)
/* nothing more to do because peer is not involved */
break;
}
- if (smc->clcsock)
+ if (do_shutdown && smc->clcsock)
rc1 = kernel_sock_shutdown(smc->clcsock, how);
/* map sock_shutdown_cmd constants to sk_shutdown value range */
sk->sk_shutdown |= how + 1;
--
2.32.0.3.g01195cf9f
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net v3] net/smc: Don't call clcsock shutdown twice when smc shutdown
2021-11-26 2:41 [PATCH net v3] net/smc: Don't call clcsock shutdown twice when smc shutdown Tony Lu
@ 2021-11-26 9:04 ` Karsten Graul
2021-11-26 19:40 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: Karsten Graul @ 2021-11-26 9:04 UTC (permalink / raw)
To: Tony Lu; +Cc: kuba, davem, netdev, linux-s390, linux-rdma
On 26/11/2021 03:41, Tony Lu wrote:
> When applications call shutdown() with SHUT_RDWR in userspace,
> smc_close_active() calls kernel_sock_shutdown(), and it is called
> twice in smc_shutdown().
>
> This fixes this by checking sk_state before do clcsock shutdown, and
> avoids missing the application's call of smc_shutdown().
>
> Link: https://lore.kernel.org/linux-s390/1f67548e-cbf6-0dce-82b5-10288a4583bd@linux.ibm.com/
> Fixes: 606a63c9783a ("net/smc: Ensure the active closing peer first closes clcsock")
> Signed-off-by: Tony Lu <tonylu@linux.alibaba.com>
> Reviewed-by: Wen Gu <guwen@linux.alibaba.com>
> ---
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net v3] net/smc: Don't call clcsock shutdown twice when smc shutdown
2021-11-26 2:41 [PATCH net v3] net/smc: Don't call clcsock shutdown twice when smc shutdown Tony Lu
2021-11-26 9:04 ` Karsten Graul
@ 2021-11-26 19:40 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-11-26 19:40 UTC (permalink / raw)
To: Tony Lu; +Cc: kgraul, kuba, davem, netdev, linux-s390, linux-rdma
Hello:
This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:
On Fri, 26 Nov 2021 10:41:35 +0800 you wrote:
> When applications call shutdown() with SHUT_RDWR in userspace,
> smc_close_active() calls kernel_sock_shutdown(), and it is called
> twice in smc_shutdown().
>
> This fixes this by checking sk_state before do clcsock shutdown, and
> avoids missing the application's call of smc_shutdown().
>
> [...]
Here is the summary with links:
- [net,v3] net/smc: Don't call clcsock shutdown twice when smc shutdown
https://git.kernel.org/netdev/net/c/bacb6c1e4769
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-11-26 2:41 [PATCH net v3] net/smc: Don't call clcsock shutdown twice when smc shutdown Tony Lu
2021-11-26 9:04 ` Karsten Graul
2021-11-26 19:40 ` patchwork-bot+netdevbpf
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