[PATCH net-next 10/10] net/smc: check for pending termination

Ursula Braun
2018-05-15T15:05:03Z

Avoid to run the processing in smc_lgr_terminate() more than once,
remember when the link group termination is triggered.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
---
net/smc/smc_clc.c | 2 +-
net/smc/smc_core.c | 5 ++++-
net/smc/smc_core.h | 3 ++-
3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index 3a988c22f627..236cb3f12c71 100644
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -316,7 +316,7 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
if (clcm->type == SMC_CLC_DECLINE) {
reason_code = SMC_CLC_DECL_REPLY;
if (((struct smc_clc_msg_decline *)buf)->hdr.flag) {
- smc->conn.lgr->sync_err = true;
+ smc->conn.lgr->sync_err = 1;
smc_lgr_terminate(smc->conn.lgr);
}
}
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index a48ee00b65ff..08c05cd0bbae 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -172,7 +172,7 @@ static int smc_lgr_create(struct smc_sock *smc,
goto out;
}
lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
- lgr->sync_err = false;
+ lgr->sync_err = 0;
memcpy(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN);
lgr->vlan_id = vlan_id;
rwlock_init(&lgr->sndbufs_lock);
@@ -352,6 +352,9 @@ void smc_lgr_terminate(struct smc_link_group *lgr)
struct smc_sock *smc;
struct rb_node *node;

+ if (lgr->terminating)
+ return; /* lgr already terminating */
+ lgr->terminating = 1;
smc_lgr_forget(lgr);
smc_llc_link_inactive(&lgr->lnk[SMC_SINGLE_LINK]);

diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
index d1753850684b..845dc073de13 100644
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -166,7 +166,8 @@ struct smc_link_group {

u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */
struct delayed_work free_work; /* delayed freeing of an lgr */
- bool sync_err; /* lgr no longer fits to peer */
+ u8 sync_err : 1; /* lgr no longer fits to peer */
+ u8 terminating : 1;/* lgr is terminating */
};

/* Find the connection associated with the given alert token in the link group.
--
2.16.3