| Message ID | 20211126024134.45693-1-tonylu@linux.alibaba.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [net,v3] net/smc: Don't call clcsock shutdown twice when smc shutdown | expand |
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>
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!
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;
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(-)