target: Convert se_lun->lun_deve_lock to normal spinlock

This patch converts se_lun->lun_deve_lock acquire/release access
to use a normal, non bottom-half spin_lock_t for protecting
se_lun->lun_deve_list access.
Reported-by: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_alua.c

@@ -968,7 +968,7 @@ static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
 			continue;
 		spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
 
-		spin_lock_bh(&lun->lun_deve_lock);
+		spin_lock(&lun->lun_deve_lock);
 		list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
 			lacl = rcu_dereference_check(se_deve->se_lun_acl,
 					lockdep_is_held(&lun->lun_deve_lock));
@@ -1000,7 +1000,7 @@ static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
 			core_scsi3_ua_allocate(se_deve, 0x2A,
 				ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
 		}
-		spin_unlock_bh(&lun->lun_deve_lock);
+		spin_unlock(&lun->lun_deve_lock);
 
 		spin_lock(&tg_pt_gp->tg_pt_gp_lock);
 		percpu_ref_put(&lun->lun_ref);

drivers/target/target_core_device.c

@@ -352,10 +352,10 @@ int core_enable_device_list_for_node(
 		hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 		mutex_unlock(&nacl->lun_entry_mutex);
 
-		spin_lock_bh(&lun->lun_deve_lock);
+		spin_lock(&lun->lun_deve_lock);
 		list_del(&orig->lun_link);
 		list_add_tail(&new->lun_link, &lun->lun_deve_list);
-		spin_unlock_bh(&lun->lun_deve_lock);
+		spin_unlock(&lun->lun_deve_lock);
 
 		kref_put(&orig->pr_kref, target_pr_kref_release);
 		wait_for_completion(&orig->pr_comp);
@@ -369,9 +369,9 @@ int core_enable_device_list_for_node(
 	hlist_add_head_rcu(&new->link, &nacl->lun_entry_hlist);
 	mutex_unlock(&nacl->lun_entry_mutex);
 
-	spin_lock_bh(&lun->lun_deve_lock);
+	spin_lock(&lun->lun_deve_lock);
 	list_add_tail(&new->lun_link, &lun->lun_deve_list);
-	spin_unlock_bh(&lun->lun_deve_lock);
+	spin_unlock(&lun->lun_deve_lock);
 
 	return 0;
 }
@@ -403,9 +403,9 @@ void core_disable_device_list_for_node(
 	 * NodeACL context specific PR metadata for demo-mode
 	 * MappedLUN *deve will be released below..
 	 */
-	spin_lock_bh(&lun->lun_deve_lock);
+	spin_lock(&lun->lun_deve_lock);
 	list_del(&orig->lun_link);
-	spin_unlock_bh(&lun->lun_deve_lock);
+	spin_unlock(&lun->lun_deve_lock);
 	/*
 	 * Disable struct se_dev_entry LUN ACL mapping
 	 */

drivers/target/target_core_pr.c

@@ -709,7 +709,7 @@ static struct t10_pr_registration *__core_scsi3_alloc_registration(
 			continue;
 		spin_unlock(&dev->se_port_lock);
 
-		spin_lock_bh(&lun_tmp->lun_deve_lock);
+		spin_lock(&lun_tmp->lun_deve_lock);
 		list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
 			/*
 			 * This pointer will be NULL for demo mode MappedLUNs
@@ -742,7 +742,7 @@ static struct t10_pr_registration *__core_scsi3_alloc_registration(
 				continue;
 
 			kref_get(&deve_tmp->pr_kref);
-			spin_unlock_bh(&lun_tmp->lun_deve_lock);
+			spin_unlock(&lun_tmp->lun_deve_lock);
 			/*
 			 * Grab a configfs group dependency that is released
 			 * for the exception path at label out: below, or upon
@@ -779,9 +779,9 @@ static struct t10_pr_registration *__core_scsi3_alloc_registration(
 
 			list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
 				      &pr_reg->pr_reg_atp_list);
-			spin_lock_bh(&lun_tmp->lun_deve_lock);
+			spin_lock(&lun_tmp->lun_deve_lock);
 		}
-		spin_unlock_bh(&lun_tmp->lun_deve_lock);
+		spin_unlock(&lun_tmp->lun_deve_lock);
 
 		spin_lock(&dev->se_port_lock);
 		percpu_ref_put(&lun_tmp->lun_ref);