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authorRoland Dreier <roland@purestorage.com>2011-08-16 09:40:01 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2011-08-22 19:28:36 +0000
commit28638887f351d11867562322b7abaa014dd5528a (patch)
tree6540c800b66ef3045e942125e57b756053fc84b5 /drivers/target/tcm_fc
parente63a8e1933a2218cf801e46dd01bd8cca4a555ec (diff)
downloadlinux-28638887f351d11867562322b7abaa014dd5528a.tar.bz2
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: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/tcm_fc')
-rw-r--r--drivers/target/tcm_fc/tfc_conf.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/target/tcm_fc/tfc_conf.c b/drivers/target/tcm_fc/tfc_conf.c
index 520a8baae794..b15879d43e22 100644
--- a/drivers/target/tcm_fc/tfc_conf.c
+++ b/drivers/target/tcm_fc/tfc_conf.c
@@ -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;
}