Commit 8caa6544 authored by Ursula Braun's avatar Ursula Braun Committed by Jakub Kicinski

net/smc: terminate link group without holding lgr lock

When a link group is to be terminated, it is sufficient to hold
the lgr lock when unlinking the link group from its list.
Move the lock-protected link group unlinking into smc_lgr_terminate().
Signed-off-by: default avatarUrsula Braun <ubraun@linux.ibm.com>
Signed-off-by: default avatarKarsten Graul <kgraul@linux.ibm.com>
Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
parent b2900980
......@@ -182,7 +182,6 @@ static void smc_lgr_free_work(struct work_struct *work)
spin_unlock_bh(lgr_lock);
return;
}
if (!list_empty(&lgr->list))
list_del_init(&lgr->list); /* remove from smc_lgr_list */
spin_unlock_bh(lgr_lock);
......@@ -479,7 +478,7 @@ void smc_lgr_forget(struct smc_link_group *lgr)
spin_unlock_bh(lgr_lock);
}
/* terminate linkgroup abnormally */
/* terminate link group */
static void __smc_lgr_terminate(struct smc_link_group *lgr)
{
struct smc_connection *conn;
......@@ -489,8 +488,6 @@ static void __smc_lgr_terminate(struct smc_link_group *lgr)
if (lgr->terminating)
return; /* lgr already terminating */
lgr->terminating = 1;
if (!list_empty(&lgr->list)) /* forget lgr */
list_del_init(&lgr->list);
if (!lgr->is_smcd)
smc_llc_link_inactive(&lgr->lnk[SMC_SINGLE_LINK]);
......@@ -516,29 +513,41 @@ static void __smc_lgr_terminate(struct smc_link_group *lgr)
smc_lgr_schedule_free_work(lgr);
}
/* unlink and terminate link group */
void smc_lgr_terminate(struct smc_link_group *lgr)
{
spinlock_t *lgr_lock;
smc_lgr_list_head(lgr, &lgr_lock);
spin_lock_bh(lgr_lock);
__smc_lgr_terminate(lgr);
if (lgr->terminating) {
spin_unlock_bh(lgr_lock);
return; /* lgr already terminating */
}
list_del_init(&lgr->list);
spin_unlock_bh(lgr_lock);
__smc_lgr_terminate(lgr);
}
/* Called when IB port is terminated */
void smc_port_terminate(struct smc_ib_device *smcibdev, u8 ibport)
{
struct smc_link_group *lgr, *l;
LIST_HEAD(lgr_free_list);
spin_lock_bh(&smc_lgr_list.lock);
list_for_each_entry_safe(lgr, l, &smc_lgr_list.list, list) {
if (!lgr->is_smcd &&
lgr->lnk[SMC_SINGLE_LINK].smcibdev == smcibdev &&
lgr->lnk[SMC_SINGLE_LINK].ibport == ibport)
__smc_lgr_terminate(lgr);
list_move(&lgr->list, &lgr_free_list);
}
spin_unlock_bh(&smc_lgr_list.lock);
list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
list_del_init(&lgr->list);
__smc_lgr_terminate(lgr);
}
}
/* Called when SMC-D device is terminated or peer is lost */
......@@ -552,7 +561,6 @@ void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
if ((!peer_gid || lgr->peer_gid == peer_gid) &&
(vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
__smc_lgr_terminate(lgr);
list_move(&lgr->list, &lgr_free_list);
}
}
......@@ -561,6 +569,7 @@ void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
/* cancel the regular free workers and actually free lgrs */
list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
list_del_init(&lgr->list);
__smc_lgr_terminate(lgr);
cancel_delayed_work_sync(&lgr->free_work);
if (!peer_gid && vlan == VLAN_VID_MASK) /* dev terminated? */
smc_ism_signal_shutdown(lgr);
......
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