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Commit 28638887 authored by Roland Dreier's avatar Roland Dreier Committed by Nicholas Bellinger
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target: Convert acl_node_lock to be IRQ-disabling 



With qla2xxx, acl_node_lock is taken inside qla2xxx's hardware_lock,
which is taken in hardirq context.  This means acl_node_lock must become
an IRQ-disabling lock; in particular this fixes lockdep warnings along
the lines of

    ======================================================
    [ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ]

     (&(&se_tpg->acl_node_lock)->rlock){+.....}, at: [<ffffffffa026f872>] transport_deregister_session+0x92/0x140 [target_core_mod]

    and this task is already holding:
     (&(&ha->hardware_lock)->rlock){-.-...}, at: [<ffffffffa017c5e7>] qla_tgt_stop_phase1+0x57/0x2c0 [qla2xxx]
    which would create a new lock dependency:
     (&(&ha->hardware_lock)->rlock){-.-...} -> (&(&se_tpg->acl_node_lock)->rlock){+.....}

    but this new dependency connects a HARDIRQ-irq-safe lock:
     (&(&ha->hardware_lock)->rlock){-.-...}

    to a HARDIRQ-irq-unsafe lock:
     (&(&se_tpg->acl_node_lock)->rlock){+.....}

Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent e63a8e19

drivers/target/target_core_device.c

+8 −8
Original line number Diff line number Diff line
@@ -472,9 +472,9 @@ void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg) 
	struct se_dev_entry *deve;

	u32 i;



	spin_lock_bh(&tpg->acl_node_lock);

	spin_lock_irq(&tpg->acl_node_lock);

	list_for_each_entry(nacl, &tpg->acl_node_list, acl_list) {

		spin_unlock_bh(&tpg->acl_node_lock);

		spin_unlock_irq(&tpg->acl_node_lock);



		spin_lock_irq(&nacl->device_list_lock);

		for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
@@ -491,9 +491,9 @@ void core_clear_lun_from_tpg(struct se_lun *lun, struct se_portal_group *tpg) 
		}

		spin_unlock_irq(&nacl->device_list_lock);



		spin_lock_bh(&tpg->acl_node_lock);

		spin_lock_irq(&tpg->acl_node_lock);

	}

	spin_unlock_bh(&tpg->acl_node_lock);

	spin_unlock_irq(&tpg->acl_node_lock);

}



static struct se_port *core_alloc_port(struct se_device *dev)
@@ -1372,17 +1372,17 @@ struct se_lun *core_dev_add_lun( 
	 */

	if (tpg->se_tpg_tfo->tpg_check_demo_mode(tpg)) {

		struct se_node_acl *acl;

		spin_lock_bh(&tpg->acl_node_lock);

		spin_lock_irq(&tpg->acl_node_lock);

		list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {

			if (acl->dynamic_node_acl &&

			    (!tpg->se_tpg_tfo->tpg_check_demo_mode_login_only ||

			     !tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg))) {

				spin_unlock_bh(&tpg->acl_node_lock);

				spin_unlock_irq(&tpg->acl_node_lock);

				core_tpg_add_node_to_devs(acl, tpg);

				spin_lock_bh(&tpg->acl_node_lock);

				spin_lock_irq(&tpg->acl_node_lock);

			}

		}

		spin_unlock_bh(&tpg->acl_node_lock);

		spin_unlock_irq(&tpg->acl_node_lock);

	}



	return lun_p;

drivers/target/target_core_pr.c

+4 −4
Original line number Diff line number Diff line
@@ -1598,14 +1598,14 @@ static int core_scsi3_decode_spec_i_port( 
			 * from the decoded fabric module specific TransportID

			 * at *i_str.

			 */

			spin_lock_bh(&tmp_tpg->acl_node_lock);

			spin_lock_irq(&tmp_tpg->acl_node_lock);

			dest_node_acl = __core_tpg_get_initiator_node_acl(

						tmp_tpg, i_str);

			if (dest_node_acl) {

				atomic_inc(&dest_node_acl->acl_pr_ref_count);

				smp_mb__after_atomic_inc();

			}

			spin_unlock_bh(&tmp_tpg->acl_node_lock);

			spin_unlock_irq(&tmp_tpg->acl_node_lock);



			if (!dest_node_acl) {

				core_scsi3_tpg_undepend_item(tmp_tpg);
@@ -3496,14 +3496,14 @@ after_iport_check: 
	/*

	 * Locate the destination struct se_node_acl from the received Transport ID

	 */

	spin_lock_bh(&dest_se_tpg->acl_node_lock);

	spin_lock_irq(&dest_se_tpg->acl_node_lock);

	dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,

				initiator_str);

	if (dest_node_acl) {

		atomic_inc(&dest_node_acl->acl_pr_ref_count);

		smp_mb__after_atomic_inc();

	}

	spin_unlock_bh(&dest_se_tpg->acl_node_lock);

	spin_unlock_irq(&dest_se_tpg->acl_node_lock);



	if (!dest_node_acl) {

		pr_err("Unable to locate %s dest_node_acl for"

drivers/target/target_core_tpg.c

+26 −26
Original line number Diff line number Diff line
@@ -137,15 +137,15 @@ struct se_node_acl *core_tpg_get_initiator_node_acl( 
{

	struct se_node_acl *acl;



	spin_lock_bh(&tpg->acl_node_lock);

	spin_lock_irq(&tpg->acl_node_lock);

	list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {

		if (!strcmp(acl->initiatorname, initiatorname) &&

		    !acl->dynamic_node_acl) {

			spin_unlock_bh(&tpg->acl_node_lock);

			spin_unlock_irq(&tpg->acl_node_lock);

			return acl;

		}

	}

	spin_unlock_bh(&tpg->acl_node_lock);

	spin_unlock_irq(&tpg->acl_node_lock);



	return NULL;

}
@@ -309,10 +309,10 @@ struct se_node_acl *core_tpg_check_initiator_node_acl( 
	else

		core_tpg_add_node_to_devs(acl, tpg);



	spin_lock_bh(&tpg->acl_node_lock);

	spin_lock_irq(&tpg->acl_node_lock);

	list_add_tail(&acl->acl_list, &tpg->acl_node_list);

	tpg->num_node_acls++;

	spin_unlock_bh(&tpg->acl_node_lock);

	spin_unlock_irq(&tpg->acl_node_lock);



	pr_debug("%s_TPG[%u] - Added DYNAMIC ACL with TCQ Depth: %d for %s"

		" Initiator Node: %s\n", tpg->se_tpg_tfo->get_fabric_name(),
@@ -362,7 +362,7 @@ struct se_node_acl *core_tpg_add_initiator_node_acl( 
{

	struct se_node_acl *acl = NULL;



	spin_lock_bh(&tpg->acl_node_lock);

	spin_lock_irq(&tpg->acl_node_lock);

	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);

	if (acl) {

		if (acl->dynamic_node_acl) {
@@ -370,7 +370,7 @@ struct se_node_acl *core_tpg_add_initiator_node_acl( 
			pr_debug("%s_TPG[%u] - Replacing dynamic ACL"

				" for %s\n", tpg->se_tpg_tfo->get_fabric_name(),

				tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);

			spin_unlock_bh(&tpg->acl_node_lock);

			spin_unlock_irq(&tpg->acl_node_lock);

			/*

			 * Release the locally allocated struct se_node_acl

			 * because * core_tpg_add_initiator_node_acl() returned
@@ -386,10 +386,10 @@ struct se_node_acl *core_tpg_add_initiator_node_acl( 
			" Node %s already exists for TPG %u, ignoring"

			" request.\n",  tpg->se_tpg_tfo->get_fabric_name(),

			initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));

		spin_unlock_bh(&tpg->acl_node_lock);

		spin_unlock_irq(&tpg->acl_node_lock);

		return ERR_PTR(-EEXIST);

	}

	spin_unlock_bh(&tpg->acl_node_lock);

	spin_unlock_irq(&tpg->acl_node_lock);



	if (!se_nacl) {

		pr_err("struct se_node_acl pointer is NULL\n");
@@ -426,10 +426,10 @@ struct se_node_acl *core_tpg_add_initiator_node_acl( 
		return ERR_PTR(-EINVAL);

	}



	spin_lock_bh(&tpg->acl_node_lock);

	spin_lock_irq(&tpg->acl_node_lock);

	list_add_tail(&acl->acl_list, &tpg->acl_node_list);

	tpg->num_node_acls++;

	spin_unlock_bh(&tpg->acl_node_lock);

	spin_unlock_irq(&tpg->acl_node_lock);



done:

	pr_debug("%s_TPG[%hu] - Added ACL with TCQ Depth: %d for %s"
@@ -453,14 +453,14 @@ int core_tpg_del_initiator_node_acl( 
	struct se_session *sess, *sess_tmp;

	int dynamic_acl = 0;



	spin_lock_bh(&tpg->acl_node_lock);

	spin_lock_irq(&tpg->acl_node_lock);

	if (acl->dynamic_node_acl) {

		acl->dynamic_node_acl = 0;

		dynamic_acl = 1;

	}

	list_del(&acl->acl_list);

	tpg->num_node_acls--;

	spin_unlock_bh(&tpg->acl_node_lock);

	spin_unlock_irq(&tpg->acl_node_lock);



	spin_lock_bh(&tpg->session_lock);

	list_for_each_entry_safe(sess, sess_tmp,
@@ -511,21 +511,21 @@ int core_tpg_set_initiator_node_queue_depth( 
	struct se_node_acl *acl;

	int dynamic_acl = 0;



	spin_lock_bh(&tpg->acl_node_lock);

	spin_lock_irq(&tpg->acl_node_lock);

	acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);

	if (!acl) {

		pr_err("Access Control List entry for %s Initiator"

			" Node %s does not exists for TPG %hu, ignoring"

			" request.\n", tpg->se_tpg_tfo->get_fabric_name(),

			initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));

		spin_unlock_bh(&tpg->acl_node_lock);

		spin_unlock_irq(&tpg->acl_node_lock);

		return -ENODEV;

	}

	if (acl->dynamic_node_acl) {

		acl->dynamic_node_acl = 0;

		dynamic_acl = 1;

	}

	spin_unlock_bh(&tpg->acl_node_lock);

	spin_unlock_irq(&tpg->acl_node_lock);



	spin_lock_bh(&tpg->session_lock);

	list_for_each_entry(sess, &tpg->tpg_sess_list, sess_list) {
@@ -541,10 +541,10 @@ int core_tpg_set_initiator_node_queue_depth( 
				tpg->se_tpg_tfo->get_fabric_name(), initiatorname);

			spin_unlock_bh(&tpg->session_lock);



			spin_lock_bh(&tpg->acl_node_lock);

			spin_lock_irq(&tpg->acl_node_lock);

			if (dynamic_acl)

				acl->dynamic_node_acl = 1;

			spin_unlock_bh(&tpg->acl_node_lock);

			spin_unlock_irq(&tpg->acl_node_lock);

			return -EEXIST;

		}

		/*
@@ -579,10 +579,10 @@ int core_tpg_set_initiator_node_queue_depth( 
		if (init_sess)

			tpg->se_tpg_tfo->close_session(init_sess);



		spin_lock_bh(&tpg->acl_node_lock);

		spin_lock_irq(&tpg->acl_node_lock);

		if (dynamic_acl)

			acl->dynamic_node_acl = 1;

		spin_unlock_bh(&tpg->acl_node_lock);

		spin_unlock_irq(&tpg->acl_node_lock);

		return -EINVAL;

	}

	spin_unlock_bh(&tpg->session_lock);
@@ -598,10 +598,10 @@ int core_tpg_set_initiator_node_queue_depth( 
		initiatorname, tpg->se_tpg_tfo->get_fabric_name(),

		tpg->se_tpg_tfo->tpg_get_tag(tpg));



	spin_lock_bh(&tpg->acl_node_lock);

	spin_lock_irq(&tpg->acl_node_lock);

	if (dynamic_acl)

		acl->dynamic_node_acl = 1;

	spin_unlock_bh(&tpg->acl_node_lock);

	spin_unlock_irq(&tpg->acl_node_lock);



	return 0;

}
@@ -725,20 +725,20 @@ int core_tpg_deregister(struct se_portal_group *se_tpg) 
	 * not been released because of TFO->tpg_check_demo_mode_cache() == 1

	 * in transport_deregister_session().

	 */

	spin_lock_bh(&se_tpg->acl_node_lock);

	spin_lock_irq(&se_tpg->acl_node_lock);

	list_for_each_entry_safe(nacl, nacl_tmp, &se_tpg->acl_node_list,

			acl_list) {

		list_del(&nacl->acl_list);

		se_tpg->num_node_acls--;

		spin_unlock_bh(&se_tpg->acl_node_lock);

		spin_unlock_irq(&se_tpg->acl_node_lock);



		core_tpg_wait_for_nacl_pr_ref(nacl);

		core_free_device_list_for_node(nacl, se_tpg);

		se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg, nacl);



		spin_lock_bh(&se_tpg->acl_node_lock);

		spin_lock_irq(&se_tpg->acl_node_lock);

	}

	spin_unlock_bh(&se_tpg->acl_node_lock);

	spin_unlock_irq(&se_tpg->acl_node_lock);



	if (se_tpg->se_tpg_type == TRANSPORT_TPG_TYPE_NORMAL)

		core_tpg_release_virtual_lun0(se_tpg);

drivers/target/tcm_fc/tfc_conf.c

+2 −2
Original line number Diff line number Diff line
@@ -256,7 +256,7 @@ struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata) 
	struct se_portal_group *se_tpg = &tpg->se_tpg;

	struct se_node_acl *se_acl;



	spin_lock_bh(&se_tpg->acl_node_lock);

	spin_lock_irq(&se_tpg->acl_node_lock);

	list_for_each_entry(se_acl, &se_tpg->acl_node_list, acl_list) {

		acl = container_of(se_acl, struct ft_node_acl, se_node_acl);

		pr_debug("acl %p port_name %llx\n",
@@ -270,7 +270,7 @@ struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata) 
			break;

		}

	}

	spin_unlock_bh(&se_tpg->acl_node_lock);

	spin_unlock_irq(&se_tpg->acl_node_lock);

	return found;

}