[PATCH 41/43] qla2xxx: Serialize session deletion by using work_lock

Himanshu Madhani
2017-12-20T06:57:46Z

for session deletion, replace sess_lock with work_lock.
Under certain case sess_lock is not feasiable to acquire.
The lock is needed temporarily to make sure a single
call to schedule of the work element.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
---
drivers/scsi/qla2xxx/qla_gbl.h | 1 -
drivers/scsi/qla2xxx/qla_gs.c | 14 ++++++--------
drivers/scsi/qla2xxx/qla_init.c | 9 +++------
drivers/scsi/qla2xxx/qla_isr.c | 4 ++--
drivers/scsi/qla2xxx/qla_mbx.c | 2 +-
drivers/scsi/qla2xxx/qla_os.c | 5 ++---
drivers/scsi/qla2xxx/qla_target.c | 29 ++++++++++++++---------------
7 files changed, 28 insertions(+), 36 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_gbl.h b/drivers/scsi/qla2xxx/qla_gbl.h
index ab8ffd7933c9..733906cb6c69 100644
--- a/drivers/scsi/qla2xxx/qla_gbl.h
+++ b/drivers/scsi/qla2xxx/qla_gbl.h
@@ -889,7 +889,6 @@ void qlt_plogi_ack_link(struct scsi_qla_host *, struct qlt_plogi_ack_t *,
struct fc_port *, enum qlt_plogi_link_t);
void qlt_plogi_ack_unref(struct scsi_qla_host *, struct qlt_plogi_ack_t *);
extern void qlt_schedule_sess_for_deletion(struct fc_port *);
-extern void qlt_schedule_sess_for_deletion_lock(struct fc_port *);
extern struct fc_port *qlt_find_sess_invalidate_other(scsi_qla_host_t *,
uint64_t wwn, port_id_t port_id, uint16_t loop_id, struct fc_port **);
void qla24xx_delete_sess_fn(struct work_struct *);
diff --git a/drivers/scsi/qla2xxx/qla_gs.c b/drivers/scsi/qla2xxx/qla_gs.c
index dd02cbfd0fb1..f26d680fe6c1 100644
--- a/drivers/scsi/qla2xxx/qla_gs.c
+++ b/drivers/scsi/qla2xxx/qla_gs.c
@@ -3096,7 +3096,7 @@ void qla24xx_handle_gidpn_event(scsi_qla_host_t *vha, struct event_arg *ea)
ql_dbg(ql_dbg_disc, vha, 0x2021,
"%s %d %8phC post del sess\n",
__func__, __LINE__, fcport->port_name);
- qlt_schedule_sess_for_deletion_lock(fcport);
+ qlt_schedule_sess_for_deletion(fcport);
}
}
} else { /* ea->sp->gen1 != fcport->rscn_gen */
@@ -3113,7 +3113,7 @@ void qla24xx_handle_gidpn_event(scsi_qla_host_t *vha, struct event_arg *ea)
ql_dbg(ql_dbg_disc, vha, 0x2042,
"%s %d %8phC post del sess\n", __func__,
__LINE__, fcport->port_name);
- qlt_schedule_sess_for_deletion_lock(fcport);
+ qlt_schedule_sess_for_deletion(fcport);
} else {
ql_dbg(ql_dbg_disc, vha, 0x2045,
"%s %d %8phC login\n", __func__, __LINE__,
@@ -3485,8 +3485,7 @@ void qla24xx_handle_gpnid_event(scsi_qla_host_t *vha, struct event_arg *ea)
"%s %d %8phC post del sess\n",
__func__, __LINE__,
fcport->port_name);
- qlt_schedule_sess_for_deletion_lock
- (fcport);
+ qlt_schedule_sess_for_deletion(fcport);
break;
}
}
@@ -3519,7 +3518,7 @@ void qla24xx_handle_gpnid_event(scsi_qla_host_t *vha, struct event_arg *ea)
"%s %d %8phC post del sess\n",
__func__, __LINE__,
conflict->port_name);
- qlt_schedule_sess_for_deletion_lock
+ qlt_schedule_sess_for_deletion
(conflict);
break;
}
@@ -3577,7 +3576,7 @@ void qla24xx_handle_gpnid_event(scsi_qla_host_t *vha, struct event_arg *ea)
"%s %d %8phC post del sess\n",
__func__, __LINE__,
conflict->port_name);
- qlt_schedule_sess_for_deletion_lock
+ qlt_schedule_sess_for_deletion
(conflict);
break;
}
@@ -4008,8 +4007,7 @@ void qla24xx_async_gnnft_done(scsi_qla_host_t *vha, srb_t *sp)
__func__, __LINE__,
fcport->port_name);

- qlt_schedule_sess_for_deletion_lock
- (fcport);
+ qlt_schedule_sess_for_deletion(fcport);
continue;
}
}
diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 3e03c264f7bd..fdb453fc9708 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -1093,7 +1093,7 @@ void qla24xx_handle_gpdb_event(scsi_qla_host_t *vha, struct event_arg *ea)
default:
ql_dbg(ql_dbg_disc, vha, 0x20d5, "%s %d %8phC post del sess\n",
__func__, __LINE__, fcport->port_name);
- qlt_schedule_sess_for_deletion_lock(fcport);
+ qlt_schedule_sess_for_deletion(fcport);
return;
}
__qla24xx_handle_gpdb_event(vha, ea);
@@ -5002,8 +5002,7 @@ qla2x00_configure_local_loop(scsi_qla_host_t *vha)
__func__, __LINE__,
fcport->port_name);

- qlt_schedule_sess_for_deletion_lock
- (fcport);
+ qlt_schedule_sess_for_deletion(fcport);
continue;
}
}
@@ -5590,9 +5589,7 @@ qla2x00_find_all_fabric_devs(scsi_qla_host_t *vha)
"%s %d %8phC post del sess\n",
__func__, __LINE__,
fcport->port_name);
-
- qlt_schedule_sess_for_deletion_lock
- (fcport);
+ qlt_schedule_sess_for_deletion(fcport);
continue;
}
}
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 6974657dd8c6..8c771aaa523c 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1009,7 +1009,7 @@ qla2x00_async_event(scsi_qla_host_t *vha, struct rsp_que *rsp, uint16_t *mb)
if (qla_ini_mode_enabled(vha)) {
qla2x00_mark_device_lost(fcport->vha, fcport, 1, 1);
fcport->logout_on_delete = 0;
- qlt_schedule_sess_for_deletion_lock(fcport);
+ qlt_schedule_sess_for_deletion(fcport);
}
break;

@@ -2706,7 +2706,7 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt)
comp_status);

qla2x00_mark_device_lost(fcport->vha, fcport, 1, 1);
- qlt_schedule_sess_for_deletion_lock(fcport);
+ qlt_schedule_sess_for_deletion(fcport);
}

break;
diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
index 68587e631f60..663509e58d9d 100644
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -3897,7 +3897,7 @@ qla24xx_report_id_acquisition(scsi_qla_host_t *vha,
case DSC_DELETE_PEND:
break;
default:
- qlt_schedule_sess_for_deletion_lock(fcport);
+ qlt_schedule_sess_for_deletion(fcport);
break;
}
} else {
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 22ab1a6dd577..a58b9de73afa 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -3858,7 +3858,7 @@ qla2x00_mark_all_devices_lost(scsi_qla_host_t *vha, int defer)

list_for_each_entry(fcport, &vha->vp_fcports, list) {
fcport->scan_state = 0;
- qlt_schedule_sess_for_deletion_lock(fcport);
+ qlt_schedule_sess_for_deletion(fcport);

if (vha->vp_idx != 0 && vha->vp_idx != fcport->vha->vp_idx)
continue;
@@ -4886,8 +4886,7 @@ void qla24xx_create_new_sess(struct scsi_qla_host *vha, struct qla_work_evt *e)
default:
fcport->login_pause = 1;
tfcp->conflict = fcport;
- qlt_schedule_sess_for_deletion_lock
- (tfcp);
+ qlt_schedule_sess_for_deletion(tfcp);
break;
}
}
diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 6b16f0dbd588..814dfb1036de 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -1214,6 +1214,7 @@ static void qla24xx_chk_fcp_state(struct fc_port *sess)
void qlt_schedule_sess_for_deletion(struct fc_port *sess)
{
struct qla_tgt *tgt = sess->tgt;
+ unsigned long flags;

if (sess->disc_state == DSC_DELETE_PEND)
return;
@@ -1229,12 +1230,19 @@ void qlt_schedule_sess_for_deletion(struct fc_port *sess)
return;
}

- sess->disc_state = DSC_DELETE_PEND;
-
if (sess->deleted == QLA_SESS_DELETED)
sess->logout_on_delete = 0;

+ spin_lock_irqsave(&sess->vha->work_lock, flags);
+ if (sess->deleted == QLA_SESS_DELETION_IN_PROGRESS) {
+ spin_unlock_irqrestore(&sess->vha->work_lock, flags);
+ return;
+ }
sess->deleted = QLA_SESS_DELETION_IN_PROGRESS;
+ spin_unlock_irqrestore(&sess->vha->work_lock, flags);
+
+ sess->disc_state = DSC_DELETE_PEND;
+
qla24xx_chk_fcp_state(sess);

ql_dbg(ql_dbg_tgt, sess->vha, 0xe001,
@@ -1244,15 +1252,6 @@ void qlt_schedule_sess_for_deletion(struct fc_port *sess)
queue_work(sess->vha->hw->wq, &sess->del_work);
}

-void qlt_schedule_sess_for_deletion_lock(struct fc_port *sess)
-{
- unsigned long flags;
- struct qla_hw_data *ha = sess->vha->hw;
- spin_lock_irqsave(&ha->tgt.sess_lock, flags);
- qlt_schedule_sess_for_deletion(sess);
- spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
-}
-
/* ha->tgt.sess_lock supposed to be held on entry */
static void qlt_clear_tgt_db(struct qla_tgt *tgt)
{
@@ -2208,7 +2207,7 @@ void qlt_xmit_tm_rsp(struct qla_tgt_mgmt_cmd *mcmd)
"TM response logo %phC status %#x state %#x",
mcmd->sess->port_name, mcmd->fc_tm_rsp,
mcmd->flags);
- qlt_schedule_sess_for_deletion_lock(mcmd->sess);
+ qlt_schedule_sess_for_deletion(mcmd->sess);
} else {
qlt_send_notify_ack(vha->hw->base_qpair,
&mcmd->orig_iocb.imm_ntfy, 0, 0, 0, 0, 0, 0);
@@ -3924,7 +3923,7 @@ static void qlt_do_ctio_completion(struct scsi_qla_host *vha,
"%s %d %8phC post del sess\n",
__func__, __LINE__, cmd->sess->port_name);

- qlt_schedule_sess_for_deletion_lock(cmd->sess);
+ qlt_schedule_sess_for_deletion(cmd->sess);
}
break;
}
@@ -4742,7 +4741,7 @@ static int qlt_handle_login(struct scsi_qla_host *vha,
__func__, __LINE__, sess->port_name);

- qlt_schedule_sess_for_deletion_lock(sess);
+ qlt_schedule_sess_for_deletion(sess);
break;
}
out:
@@ -4970,7 +4969,7 @@ static int qlt_24xx_handle_els(struct scsi_qla_host *vha,
} else {
/* cmd did not go to upper layer. */
if (sess) {
- qlt_schedule_sess_for_deletion_lock(sess);
+ qlt_schedule_sess_for_deletion(sess);
res = 0;
}
/* else logo will be ack */
--
2.12.0