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tcm_qla2xxx: introduce a private sess_kref 

This stops abusing the common sess_kref to overload it for private
usage, which allows removing the shutdown_session method as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2016-05-02 15:45:23 +02:00 committed by Nicholas Bellinger
parent 36ec2ddc0d
commit e3dc0e3165
3 changed files with 35 additions and 64 deletions
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56
drivers/scsi/qla2xxx/qla_target.c
View File

@ -637,8 +637,10 @@ static void qlt_free_session_done(struct work_struct *work)
}
/* ha->tgt.sess_lock supposed to be held on entry */
void qlt_unreg_sess(struct qla_tgt_sess *sess)
static void qlt_release_session(struct kref *kref)
{
struct qla_tgt_sess *sess =
container_of(kref, struct qla_tgt_sess, sess_kref);
struct scsi_qla_host *vha = sess->vha;
if (sess->se_sess)
@ -651,8 +653,16 @@ void qlt_unreg_sess(struct qla_tgt_sess *sess)
INIT_WORK(&sess->free_work, qlt_free_session_done);
schedule_work(&sess->free_work);
}
EXPORT_SYMBOL(qlt_unreg_sess);
void qlt_put_sess(struct qla_tgt_sess *sess)
{
if (!sess)
return;
assert_spin_locked(&sess->vha->hw->tgt.sess_lock);
kref_put(&sess->sess_kref, qlt_release_session);
}
EXPORT_SYMBOL(qlt_put_sess);
static int qlt_reset(struct scsi_qla_host *vha, void *iocb, int mcmd)
{
@ -857,12 +867,9 @@ static void qlt_del_sess_work_fn(struct delayed_work *work)
ql_dbg(ql_dbg_tgt_mgt, vha, 0xf004,
"Timeout: sess %p about to be deleted\n",
sess);
if (sess->se_sess) {
if (sess->se_sess)
ha->tgt.tgt_ops->shutdown_sess(sess);
ha->tgt.tgt_ops->put_sess(sess);
} else {
qlt_unreg_sess(sess);
}
qlt_put_sess(sess);
} else {
schedule_delayed_work(&tgt->sess_del_work,
sess->expires - elapsed);
@ -917,7 +924,7 @@ static struct qla_tgt_sess *qlt_create_sess(
}
}
kref_get(&sess->se_sess->sess_kref);
kref_get(&sess->sess_kref);
ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id,
(fcport->flags & FCF_CONF_COMP_SUPPORTED));
@ -947,6 +954,7 @@ static struct qla_tgt_sess *qlt_create_sess(
sess->s_id = fcport->d_id;
sess->loop_id = fcport->loop_id;
sess->local = local;
kref_init(&sess->sess_kref);
INIT_LIST_HEAD(&sess->del_list_entry);
/* Under normal circumstances we want to logout from firmware when
@ -991,7 +999,7 @@ static struct qla_tgt_sess *qlt_create_sess(
* Take an extra reference to ->sess_kref here to handle qla_tgt_sess
* access across ->tgt.sess_lock reaquire.
*/
kref_get(&sess->se_sess->sess_kref);
kref_get(&sess->sess_kref);
}
return sess;
@ -1035,7 +1043,7 @@ void qlt_fc_port_added(struct scsi_qla_host *vha, fc_port_t *fcport)
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
return;
} else {
kref_get(&sess->se_sess->sess_kref);
kref_get(&sess->sess_kref);
if (sess->deleted) {
qlt_undelete_sess(sess);
@ -1060,7 +1068,7 @@ void qlt_fc_port_added(struct scsi_qla_host *vha, fc_port_t *fcport)
fcport->port_name, sess->loop_id);
sess->local = 0;
}
ha->tgt.tgt_ops->put_sess(sess);
qlt_put_sess(sess);
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
}
@ -3817,7 +3825,7 @@ static void __qlt_do_work(struct qla_tgt_cmd *cmd)
* Drop extra session reference from qla_tgt_handle_cmd_for_atio*(
*/
spin_lock_irqsave(&ha->tgt.sess_lock, flags);
ha->tgt.tgt_ops->put_sess(sess);
qlt_put_sess(sess);
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
return;
@ -3836,7 +3844,7 @@ out_term:
spin_unlock_irqrestore(&ha->hardware_lock, flags);
spin_lock_irqsave(&ha->tgt.sess_lock, flags);
ha->tgt.tgt_ops->put_sess(sess);
qlt_put_sess(sess);
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
}
@ -3936,13 +3944,13 @@ static void qlt_create_sess_from_atio(struct work_struct *work)
if (!cmd) {
spin_lock_irqsave(&ha->hardware_lock, flags);
qlt_send_busy(vha, &op->atio, SAM_STAT_BUSY);
ha->tgt.tgt_ops->put_sess(sess);
qlt_put_sess(sess);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
kfree(op);
return;
}
/*
* __qlt_do_work() will call ha->tgt.tgt_ops->put_sess() to release
* __qlt_do_work() will call qlt_put_sess() to release
* the extra reference taken above by qlt_make_local_sess()
*/
__qlt_do_work(cmd);
@ -4003,13 +4011,13 @@ static int qlt_handle_cmd_for_atio(struct scsi_qla_host *vha,
/*
* Do kref_get() before returning + dropping qla_hw_data->hardware_lock.
*/
kref_get(&sess->se_sess->sess_kref);
kref_get(&sess->sess_kref);
cmd = qlt_get_tag(vha, sess, atio);
if (!cmd) {
ql_dbg(ql_dbg_io, vha, 0x3062,
"qla_target(%d): Allocation of cmd failed\n", vha->vp_idx);
ha->tgt.tgt_ops->put_sess(sess);
qlt_put_sess(sess);
return -ENOMEM;
}
@ -5911,7 +5919,7 @@ static void qlt_abort_work(struct qla_tgt *tgt,
goto out_term2;
}
kref_get(&sess->se_sess->sess_kref);
kref_get(&sess->sess_kref);
}
spin_lock_irqsave(&ha->hardware_lock, flags);
@ -5924,7 +5932,7 @@ static void qlt_abort_work(struct qla_tgt *tgt,
goto out_term;
spin_unlock_irqrestore(&ha->hardware_lock, flags);
ha->tgt.tgt_ops->put_sess(sess);
qlt_put_sess(sess);
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags2);
return;
@ -5935,8 +5943,7 @@ out_term:
qlt_24xx_send_abts_resp(vha, &prm->abts, FCP_TMF_REJECTED, false);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
if (sess)
ha->tgt.tgt_ops->put_sess(sess);
qlt_put_sess(sess);
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags2);
}
@ -5976,7 +5983,7 @@ static void qlt_tmr_work(struct qla_tgt *tgt,
goto out_term;
}
kref_get(&sess->se_sess->sess_kref);
kref_get(&sess->sess_kref);
}
iocb = a;
@ -5988,14 +5995,13 @@ static void qlt_tmr_work(struct qla_tgt *tgt,
if (rc != 0)
goto out_term;
ha->tgt.tgt_ops->put_sess(sess);
qlt_put_sess(sess);
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
return;
out_term:
qlt_send_term_exchange(vha, NULL, &prm->tm_iocb2, 1, 0);
if (sess)
ha->tgt.tgt_ops->put_sess(sess);
qlt_put_sess(sess);
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
}

4
drivers/scsi/qla2xxx/qla_target.h
View File

@ -738,7 +738,6 @@ struct qla_tgt_func_tmpl {
struct qla_tgt_sess *(*find_sess_by_s_id)(struct scsi_qla_host *,
const uint8_t *);
void (*clear_nacl_from_fcport_map)(struct qla_tgt_sess *);
void (*put_sess)(struct qla_tgt_sess *);
void (*shutdown_sess)(struct qla_tgt_sess *);
};
@ -930,6 +929,7 @@ struct qla_tgt_sess {
int generation;
struct se_session *se_sess;
struct kref sess_kref;
struct scsi_qla_host *vha;
struct qla_tgt *tgt;
@ -1101,7 +1101,7 @@ extern int qlt_remove_target(struct qla_hw_data *, struct scsi_qla_host *);
extern int qlt_lport_register(void *, u64, u64, u64,
int (*callback)(struct scsi_qla_host *, void *, u64, u64));
extern void qlt_lport_deregister(struct scsi_qla_host *);
extern void qlt_unreg_sess(struct qla_tgt_sess *);
void qlt_put_sess(struct qla_tgt_sess *sess);
extern void qlt_fc_port_added(struct scsi_qla_host *, fc_port_t *);
extern void qlt_fc_port_deleted(struct scsi_qla_host *, fc_port_t *, int);
extern int __init qlt_init(void);

39
drivers/scsi/qla2xxx/tcm_qla2xxx.c
View File

@ -339,22 +339,6 @@ static void tcm_qla2xxx_release_cmd(struct se_cmd *se_cmd)
qlt_free_cmd(cmd);
}
static int tcm_qla2xxx_shutdown_session(struct se_session *se_sess)
{
struct qla_tgt_sess *sess = se_sess->fabric_sess_ptr;
struct scsi_qla_host *vha;
unsigned long flags;
BUG_ON(!sess);
vha = sess->vha;
spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
target_sess_cmd_list_set_waiting(se_sess);
spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
return 1;
}
static void tcm_qla2xxx_close_session(struct se_session *se_sess)
{
struct qla_tgt_sess *sess = se_sess->fabric_sess_ptr;
@ -365,7 +349,8 @@ static void tcm_qla2xxx_close_session(struct se_session *se_sess)
vha = sess->vha;
spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
qlt_unreg_sess(sess);
target_sess_cmd_list_set_waiting(se_sess);
qlt_put_sess(sess);
spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
}
@ -758,23 +743,6 @@ static void tcm_qla2xxx_clear_nacl_from_fcport_map(struct qla_tgt_sess *sess)
tcm_qla2xxx_clear_sess_lookup(lport, nacl, sess);
}
static void tcm_qla2xxx_release_session(struct kref *kref)
{
struct se_session *se_sess = container_of(kref,
struct se_session, sess_kref);
qlt_unreg_sess(se_sess->fabric_sess_ptr);
}
static void tcm_qla2xxx_put_sess(struct qla_tgt_sess *sess)
{
if (!sess)
return;
assert_spin_locked(&sess->vha->hw->tgt.sess_lock);
kref_put(&sess->se_sess->sess_kref, tcm_qla2xxx_release_session);
}
static void tcm_qla2xxx_shutdown_sess(struct qla_tgt_sess *sess)
{
assert_spin_locked(&sess->vha->hw->tgt.sess_lock);
@ -1579,7 +1547,6 @@ static struct qla_tgt_func_tmpl tcm_qla2xxx_template = {
.find_sess_by_s_id = tcm_qla2xxx_find_sess_by_s_id,
.find_sess_by_loop_id = tcm_qla2xxx_find_sess_by_loop_id,
.clear_nacl_from_fcport_map = tcm_qla2xxx_clear_nacl_from_fcport_map,
.put_sess = tcm_qla2xxx_put_sess,
.shutdown_sess = tcm_qla2xxx_shutdown_sess,
};
@ -1847,7 +1814,6 @@ static const struct target_core_fabric_ops tcm_qla2xxx_ops = {
.tpg_get_inst_index = tcm_qla2xxx_tpg_get_inst_index,
.check_stop_free = tcm_qla2xxx_check_stop_free,
.release_cmd = tcm_qla2xxx_release_cmd,
.shutdown_session = tcm_qla2xxx_shutdown_session,
.close_session = tcm_qla2xxx_close_session,
.sess_get_index = tcm_qla2xxx_sess_get_index,
.sess_get_initiator_sid = NULL,
@ -1890,7 +1856,6 @@ static const struct target_core_fabric_ops tcm_qla2xxx_npiv_ops = {
.tpg_get_inst_index = tcm_qla2xxx_tpg_get_inst_index,
.check_stop_free = tcm_qla2xxx_check_stop_free,
.release_cmd = tcm_qla2xxx_release_cmd,
.shutdown_session = tcm_qla2xxx_shutdown_session,
.close_session = tcm_qla2xxx_close_session,
.sess_get_index = tcm_qla2xxx_sess_get_index,
.sess_get_initiator_sid = NULL,