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authorUrsula Braun <ubraun@linux.ibm.com>2019-11-14 15:02:43 +0300
committerDavid S. Miller <davem@davemloft.net>2019-11-15 23:28:28 +0300
commit5edd6b9cb8d7c6c346c93c52a53735591127e879 (patch)
treeb8ef0b599ed2379d37c113e1b9a3f39c444a979b /net/smc
parent5421ec281df9dfda4418c02959e1f76097cabd9a (diff)
downloadlinux-5edd6b9cb8d7c6c346c93c52a53735591127e879.tar.xz
net/smc: introduce bookkeeping of SMCD link groups
If the ism module is unloaded return control from exit routine only, if all link groups are freed. If an IB device is thrown away return control from device removal only, if all link groups belonging to this device are freed. A counters for the total number of SMCD link groups per ISM device is introduced. ism module unloading continues only if the total number of SMCD link groups for all ISM devices is zero. ISM device removal continues only it the total number of SMCD link groups per ISM device has decreased to zero. Signed-off-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc')
-rw-r--r--net/smc/smc_core.c6
-rw-r--r--net/smc/smc_ism.c1
2 files changed, 7 insertions, 0 deletions
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index d79dd78c1cd8..30854acb846c 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -276,6 +276,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
lgr_list = &ini->ism_dev->lgr_list;
lgr_lock = &lgr->smcd->lgr_lock;
lgr->peer_shutdown = 0;
+ atomic_inc(&ini->ism_dev->lgr_cnt);
} else {
/* SMC-R specific settings */
get_device(&ini->ib_dev->ibdev->dev);
@@ -486,6 +487,8 @@ static void smc_lgr_free(struct smc_link_group *lgr)
smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
put_device(&lgr->smcd->dev);
}
+ if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
+ wake_up(&lgr->smcd->lgrs_deleted);
} else {
smc_link_clear(&lgr->lnk[SMC_SINGLE_LINK]);
put_device(&lgr->lnk[SMC_SINGLE_LINK].smcibdev->ibdev->dev);
@@ -685,6 +688,9 @@ void smc_smcd_terminate_all(struct smcd_dev *smcd)
list_del_init(&lgr->list);
__smc_lgr_terminate(lgr, false);
}
+
+ if (atomic_read(&smcd->lgr_cnt))
+ wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
}
/* Determine vlan of internal TCP socket.
diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index 56cdab8be1fa..5c4727d5066e 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -302,6 +302,7 @@ struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
spin_lock_init(&smcd->lgr_lock);
INIT_LIST_HEAD(&smcd->vlan);
INIT_LIST_HEAD(&smcd->lgr_list);
+ init_waitqueue_head(&smcd->lgrs_deleted);
smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
WQ_MEM_RECLAIM, name);
if (!smcd->event_wq) {