Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax

Pull IDA updates from Matthew Wilcox:
 "A better IDA API:

      id = ida_alloc(ida, GFP_xxx);
      ida_free(ida, id);

  rather than the cumbersome ida_simple_get(), ida_simple_remove().

  The new IDA API is similar to ida_simple_get() but better named.  The
  internal restructuring of the IDA code removes the bitmap
  preallocation nonsense.

  I hope the net -200 lines of code is convincing"

* 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax: (29 commits)
  ida: Change ida_get_new_above to return the id
  ida: Remove old API
  test_ida: check_ida_destroy and check_ida_alloc
  test_ida: Convert check_ida_conv to new API
  test_ida: Move ida_check_max
  test_ida: Move ida_check_leaf
  idr-test: Convert ida_check_nomem to new API
  ida: Start new test_ida module
  target/iscsi: Allocate session IDs from an IDA
  iscsi target: fix session creation failure handling
  drm/vmwgfx: Convert to new IDA API
  dmaengine: Convert to new IDA API
  ppc: Convert vas ID allocation to new IDA API
  media: Convert entity ID allocation to new IDA API
  ppc: Convert mmu context allocation to new IDA API
  Convert net_namespace to new IDA API
  cb710: Convert to new IDA API
  rsxx: Convert to new IDA API
  osd: Convert to new IDA API
  sd: Convert to new IDA API
  ...

11 files changed, 72 insertions, 179 deletions

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index db253cd5b32a..d0666f5ce003 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -118,7 +118,6 @@ static struct dentry *dfs_device_status;
 
 static u32 cpu_use[NR_CPUS];
 
-static DEFINE_SPINLOCK(rssd_index_lock);
 static DEFINE_IDA(rssd_index_ida);
 
 static int mtip_block_initialize(struct driver_data *dd);
@@ -3767,20 +3766,10 @@ static int mtip_block_initialize(struct driver_data *dd)
 		goto alloc_disk_error;
 	}
 
-	/* Generate the disk name, implemented same as in sd.c */
-	do {
-		if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL)) {
-			rv = -ENOMEM;
-			goto ida_get_error;
-		}
-
-		spin_lock(&rssd_index_lock);
-		rv = ida_get_new(&rssd_index_ida, &index);
-		spin_unlock(&rssd_index_lock);
-	} while (rv == -EAGAIN);
-
-	if (rv)
+	rv = ida_alloc(&rssd_index_ida, GFP_KERNEL);
+	if (rv < 0)
 		goto ida_get_error;
+	index = rv;
 
 	rv = rssd_disk_name_format("rssd",
 				index,
@@ -3922,9 +3911,7 @@ block_queue_alloc_init_error:
 block_queue_alloc_tag_error:
 	mtip_hw_debugfs_exit(dd);
 disk_index_error:
-	spin_lock(&rssd_index_lock);
-	ida_remove(&rssd_index_ida, index);
-	spin_unlock(&rssd_index_lock);
+	ida_free(&rssd_index_ida, index);
 
 ida_get_error:
 	put_disk(dd->disk);
@@ -4012,9 +3999,7 @@ static int mtip_block_remove(struct driver_data *dd)
 	}
 	dd->disk  = NULL;
 
-	spin_lock(&rssd_index_lock);
-	ida_remove(&rssd_index_ida, dd->index);
-	spin_unlock(&rssd_index_lock);
+	ida_free(&rssd_index_ida, dd->index);
 
 	/* De-initialize the protocol layer. */
 	mtip_hw_exit(dd);
@@ -4054,9 +4039,7 @@ static int mtip_block_shutdown(struct driver_data *dd)
 		dd->queue = NULL;
 	}
 
-	spin_lock(&rssd_index_lock);
-	ida_remove(&rssd_index_ida, dd->index);
-	spin_unlock(&rssd_index_lock);
+	ida_free(&rssd_index_ida, dd->index);
 	return 0;
 }
 
diff --git a/drivers/block/rsxx/core.c b/drivers/block/rsxx/core.c
index b7d71914a32a..f2c631ce793c 100644
--- a/drivers/block/rsxx/core.c
+++ b/drivers/block/rsxx/core.c
@@ -58,7 +58,6 @@ MODULE_PARM_DESC(sync_start, "On by Default: Driver load will not complete "
 			     "until the card startup has completed.");
 
 static DEFINE_IDA(rsxx_disk_ida);
-static DEFINE_SPINLOCK(rsxx_ida_lock);
 
 /* --------------------Debugfs Setup ------------------- */
 
@@ -771,19 +770,10 @@ static int rsxx_pci_probe(struct pci_dev *dev,
 	card->dev = dev;
 	pci_set_drvdata(dev, card);
 
-	do {
-		if (!ida_pre_get(&rsxx_disk_ida, GFP_KERNEL)) {
-			st = -ENOMEM;
-			goto failed_ida_get;
-		}
-
-		spin_lock(&rsxx_ida_lock);
-		st = ida_get_new(&rsxx_disk_ida, &card->disk_id);
-		spin_unlock(&rsxx_ida_lock);
-	} while (st == -EAGAIN);
-
-	if (st)
+	st = ida_alloc(&rsxx_disk_ida, GFP_KERNEL);
+	if (st < 0)
 		goto failed_ida_get;
+	card->disk_id = st;
 
 	st = pci_enable_device(dev);
 	if (st)
@@ -985,9 +975,7 @@ failed_request_regions:
 failed_dma_mask:
 	pci_disable_device(dev);
 failed_enable:
-	spin_lock(&rsxx_ida_lock);
-	ida_remove(&rsxx_disk_ida, card->disk_id);
-	spin_unlock(&rsxx_ida_lock);
+	ida_free(&rsxx_disk_ida, card->disk_id);
 failed_ida_get:
 	kfree(card);
 
@@ -1050,6 +1038,7 @@ static void rsxx_pci_remove(struct pci_dev *dev)
 	pci_disable_device(dev);
 	pci_release_regions(dev);
 
+	ida_free(&rsxx_disk_ida, card->disk_id);
 	kfree(card);
 }
 
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 272bed6c8ba7..f1a441ab395d 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -161,9 +161,7 @@ static void chan_dev_release(struct device *dev)
 
 	chan_dev = container_of(dev, typeof(*chan_dev), device);
 	if (atomic_dec_and_test(chan_dev->idr_ref)) {
-		mutex_lock(&dma_list_mutex);
-		ida_remove(&dma_ida, chan_dev->dev_id);
-		mutex_unlock(&dma_list_mutex);
+		ida_free(&dma_ida, chan_dev->dev_id);
 		kfree(chan_dev->idr_ref);
 	}
 	kfree(chan_dev);
@@ -898,17 +896,12 @@ static bool device_has_all_tx_types(struct dma_device *device)
 
 static int get_dma_id(struct dma_device *device)
 {
-	int rc;
-
-	do {
-		if (!ida_pre_get(&dma_ida, GFP_KERNEL))
-			return -ENOMEM;
-		mutex_lock(&dma_list_mutex);
-		rc = ida_get_new(&dma_ida, &device->dev_id);
-		mutex_unlock(&dma_list_mutex);
-	} while (rc == -EAGAIN);
+	int rc = ida_alloc(&dma_ida, GFP_KERNEL);
 
-	return rc;
+	if (rc < 0)
+		return rc;
+	device->dev_id = rc;
+	return 0;
 }
 
 /**
@@ -1092,9 +1085,7 @@ int dma_async_device_register(struct dma_device *device)
 err_out:
 	/* if we never registered a channel just release the idr */
 	if (atomic_read(idr_ref) == 0) {
-		mutex_lock(&dma_list_mutex);
-		ida_remove(&dma_ida, device->dev_id);
-		mutex_unlock(&dma_list_mutex);
+		ida_free(&dma_ida, device->dev_id);
 		kfree(idr_ref);
 		return rc;
 	}
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c b/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
index ddb1e9365a3e..b93c558dd86e 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
@@ -51,51 +51,34 @@ static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
 {
 	struct vmwgfx_gmrid_man *gman =
 		(struct vmwgfx_gmrid_man *)man->priv;
-	int ret = 0;
 	int id;
 
 	mem->mm_node = NULL;
 
+	id = ida_alloc_max(&gman->gmr_ida, gman->max_gmr_ids - 1, GFP_KERNEL);
+	if (id < 0)
+		return id;
+
 	spin_lock(&gman->lock);
 
 	if (gman->max_gmr_pages > 0) {
 		gman->used_gmr_pages += bo->num_pages;
 		if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
-			goto out_err_locked;
+			goto nospace;
 	}
 
-	do {
-		spin_unlock(&gman->lock);
-		if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
-			ret = -ENOMEM;
-			goto out_err;
-		}
-		spin_lock(&gman->lock);
-
-		ret = ida_get_new(&gman->gmr_ida, &id);
-		if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
-			ida_remove(&gman->gmr_ida, id);
-			ret = 0;
-			goto out_err_locked;
-		}
-	} while (ret == -EAGAIN);
-
-	if (likely(ret == 0)) {
-		mem->mm_node = gman;
-		mem->start = id;
-		mem->num_pages = bo->num_pages;
-	} else
-		goto out_err_locked;
+	mem->mm_node = gman;
+	mem->start = id;
+	mem->num_pages = bo->num_pages;
 
 	spin_unlock(&gman->lock);
 	return 0;
 
-out_err:
-	spin_lock(&gman->lock);
-out_err_locked:
+nospace:
 	gman->used_gmr_pages -= bo->num_pages;
 	spin_unlock(&gman->lock);
-	return ret;
+	ida_free(&gman->gmr_ida, id);
+	return 0;
 }
 
 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
@@ -105,8 +88,8 @@ static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
 		(struct vmwgfx_gmrid_man *)man->priv;
 
 	if (mem->mm_node) {
+		ida_free(&gman->gmr_ida, mem->start);
 		spin_lock(&gman->lock);
-		ida_remove(&gman->gmr_ida, mem->start);
 		gman->used_gmr_pages -= mem->num_pages;
 		spin_unlock(&gman->lock);
 		mem->mm_node = NULL;
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index fcdf3d5dc4b6..3bae24b15eaa 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -585,18 +585,12 @@ int __must_check media_device_register_entity(struct media_device *mdev,
 	entity->num_links = 0;
 	entity->num_backlinks = 0;
 
-	if (!ida_pre_get(&mdev->entity_internal_idx, GFP_KERNEL))
-		return -ENOMEM;
-
-	mutex_lock(&mdev->graph_mutex);
-
-	ret = ida_get_new_above(&mdev->entity_internal_idx, 1,
-				&entity->internal_idx);
-	if (ret < 0) {
-		mutex_unlock(&mdev->graph_mutex);
+	ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL);
+	if (ret < 0)
 		return ret;
-	}
+	entity->internal_idx = ret;
 
+	mutex_lock(&mdev->graph_mutex);
 	mdev->entity_internal_idx_max =
 		max(mdev->entity_internal_idx_max, entity->internal_idx);
 
@@ -642,7 +636,7 @@ static void __media_device_unregister_entity(struct media_entity *entity)
 	struct media_interface *intf;
 	unsigned int i;
 
-	ida_simple_remove(&mdev->entity_internal_idx, entity->internal_idx);
+	ida_free(&mdev->entity_internal_idx, entity->internal_idx);
 
 	/* Remove all interface links pointing to this entity */
 	list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
diff --git a/drivers/misc/cb710/core.c b/drivers/misc/cb710/core.c
index 4d4acf763b65..2c43fd09d602 100644
--- a/drivers/misc/cb710/core.c
+++ b/drivers/misc/cb710/core.c
@@ -16,7 +16,6 @@
 #include <linux/gfp.h>
 
 static DEFINE_IDA(cb710_ida);
-static DEFINE_SPINLOCK(cb710_ida_lock);
 
 void cb710_pci_update_config_reg(struct pci_dev *pdev,
 	int reg, uint32_t mask, uint32_t xor)
@@ -205,7 +204,6 @@ static int cb710_probe(struct pci_dev *pdev,
 	const struct pci_device_id *ent)
 {
 	struct cb710_chip *chip;
-	unsigned long flags;
 	u32 val;
 	int err;
 	int n = 0;
@@ -256,18 +254,10 @@ static int cb710_probe(struct pci_dev *pdev,
 	if (err)
 		return err;
 
-	do {
-		if (!ida_pre_get(&cb710_ida, GFP_KERNEL))
-			return -ENOMEM;
-
-		spin_lock_irqsave(&cb710_ida_lock, flags);
-		err = ida_get_new(&cb710_ida, &chip->platform_id);
-		spin_unlock_irqrestore(&cb710_ida_lock, flags);
-
-		if (err && err != -EAGAIN)
-			return err;
-	} while (err);
-
+	err = ida_alloc(&cb710_ida, GFP_KERNEL);
+	if (err < 0)
+		return err;
+	chip->platform_id = err;
 
 	dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n",
 		chip->platform_id, chip->iobase, pdev->irq);
@@ -308,7 +298,6 @@ unreg_mmc:
 static void cb710_remove_one(struct pci_dev *pdev)
 {
 	struct cb710_chip *chip = pci_get_drvdata(pdev);
-	unsigned long flags;
 
 	cb710_unregister_slot(chip, CB710_SLOT_SM);
 	cb710_unregister_slot(chip, CB710_SLOT_MS);
@@ -317,9 +306,7 @@ static void cb710_remove_one(struct pci_dev *pdev)
 	BUG_ON(atomic_read(&chip->slot_refs_count) != 0);
 #endif
 
-	spin_lock_irqsave(&cb710_ida_lock, flags);
-	ida_remove(&cb710_ida, chip->platform_id);
-	spin_unlock_irqrestore(&cb710_ida_lock, flags);
+	ida_free(&cb710_ida, chip->platform_id);
 }
 
 static const struct pci_device_id cb710_pci_tbl[] = {
diff --git a/drivers/scsi/osd/osd_uld.c b/drivers/scsi/osd/osd_uld.c
index 0e56f1eb05dc..eaf36ccf58db 100644
--- a/drivers/scsi/osd/osd_uld.c
+++ b/drivers/scsi/osd/osd_uld.c
@@ -423,19 +423,11 @@ static int osd_probe(struct device *dev)
 	if (scsi_device->type != TYPE_OSD)
 		return -ENODEV;
 
-	do {
-		if (!ida_pre_get(&osd_minor_ida, GFP_KERNEL))
-			return -ENODEV;
-
-		error = ida_get_new(&osd_minor_ida, &minor);
-	} while (error == -EAGAIN);
-
-	if (error)
-		return error;
-	if (minor >= SCSI_OSD_MAX_MINOR) {
-		error = -EBUSY;
-		goto err_retract_minor;
-	}
+	minor = ida_alloc_max(&osd_minor_ida, SCSI_OSD_MAX_MINOR, GFP_KERNEL);
+	if (minor == -ENOSPC)
+		return -EBUSY;
+	if (minor < 0)
+		return -ENODEV;
 
 	error = -ENOMEM;
 	oud = kzalloc(sizeof(*oud), GFP_KERNEL);
@@ -499,7 +491,7 @@ static int osd_probe(struct device *dev)
 err_free_osd:
 	put_device(&oud->class_dev);
 err_retract_minor:
-	ida_remove(&osd_minor_ida, minor);
+	ida_free(&osd_minor_ida, minor);
 	return error;
 }
 
@@ -514,7 +506,7 @@ static int osd_remove(struct device *dev)
 	}
 
 	cdev_device_del(&oud->cdev, &oud->class_dev);
-	ida_remove(&osd_minor_ida, oud->minor);
+	ida_free(&osd_minor_ida, oud->minor);
 	put_device(&oud->class_dev);
 
 	return 0;
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a58cee7a85f2..b79b366a94f7 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -123,7 +123,6 @@ static void scsi_disk_release(struct device *cdev);
 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 static void sd_print_result(const struct scsi_disk *, const char *, int);
 
-static DEFINE_SPINLOCK(sd_index_lock);
 static DEFINE_IDA(sd_index_ida);
 
 /* This semaphore is used to mediate the 0->1 reference get in the
@@ -3340,16 +3339,8 @@ static int sd_probe(struct device *dev)
 	if (!gd)
 		goto out_free;
 
-	do {
-		if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
-			goto out_put;
-
-		spin_lock(&sd_index_lock);
-		error = ida_get_new(&sd_index_ida, &index);
-		spin_unlock(&sd_index_lock);
-	} while (error == -EAGAIN);
-
-	if (error) {
+	index = ida_alloc(&sd_index_ida, GFP_KERNEL);
+	if (index < 0) {
 		sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
 		goto out_put;
 	}
@@ -3393,9 +3384,7 @@ static int sd_probe(struct device *dev)
 	return 0;
 
  out_free_index:
-	spin_lock(&sd_index_lock);
-	ida_remove(&sd_index_ida, index);
-	spin_unlock(&sd_index_lock);
+	ida_free(&sd_index_ida, index);
  out_put:
 	put_disk(gd);
  out_free:
@@ -3460,9 +3449,7 @@ static void scsi_disk_release(struct device *dev)
 	struct scsi_disk *sdkp = to_scsi_disk(dev);
 	struct gendisk *disk = sdkp->disk;
 	
-	spin_lock(&sd_index_lock);
-	ida_remove(&sd_index_ida, sdkp->index);
-	spin_unlock(&sd_index_lock);
+	ida_free(&sd_index_ida, sdkp->index);
 
 	disk->private_data = NULL;
 	put_disk(disk);
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 8e223799347a..94bad43c41ff 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -57,9 +57,8 @@ static DEFINE_SPINLOCK(tiqn_lock);
 static DEFINE_MUTEX(np_lock);
 
 static struct idr tiqn_idr;
-struct idr sess_idr;
+DEFINE_IDA(sess_ida);
 struct mutex auth_id_lock;
-spinlock_t sess_idr_lock;
 
 struct iscsit_global *iscsit_global;
 
@@ -700,9 +699,7 @@ static int __init iscsi_target_init_module(void)
 
 	spin_lock_init(&iscsit_global->ts_bitmap_lock);
 	mutex_init(&auth_id_lock);
-	spin_lock_init(&sess_idr_lock);
 	idr_init(&tiqn_idr);
-	idr_init(&sess_idr);
 
 	ret = target_register_template(&iscsi_ops);
 	if (ret)
@@ -4375,10 +4372,7 @@ int iscsit_close_session(struct iscsi_session *sess)
 	pr_debug("Decremented number of active iSCSI Sessions on"
 		" iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
 
-	spin_lock(&sess_idr_lock);
-	idr_remove(&sess_idr, sess->session_index);
-	spin_unlock(&sess_idr_lock);
-
+	ida_free(&sess_ida, sess->session_index);
 	kfree(sess->sess_ops);
 	sess->sess_ops = NULL;
 	spin_unlock_bh(&se_tpg->session_lock);
diff --git a/drivers/target/iscsi/iscsi_target.h b/drivers/target/iscsi/iscsi_target.h
index 42de1843aa40..48bac0acf8c7 100644
--- a/drivers/target/iscsi/iscsi_target.h
+++ b/drivers/target/iscsi/iscsi_target.h
@@ -55,9 +55,7 @@ extern struct kmem_cache *lio_ooo_cache;
 extern struct kmem_cache *lio_qr_cache;
 extern struct kmem_cache *lio_r2t_cache;
 
-extern struct idr sess_idr;
+extern struct ida sess_ida;
 extern struct mutex auth_id_lock;
-extern spinlock_t sess_idr_lock;
-
 
 #endif   /*** ISCSI_TARGET_H ***/
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index 923b1a9fc3dc..9e74f8bc2963 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -336,22 +336,15 @@ static int iscsi_login_zero_tsih_s1(
 	timer_setup(&sess->time2retain_timer,
 		    iscsit_handle_time2retain_timeout, 0);
 
-	idr_preload(GFP_KERNEL);
-	spin_lock_bh(&sess_idr_lock);
-	ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
-	if (ret >= 0)
-		sess->session_index = ret;
-	spin_unlock_bh(&sess_idr_lock);
-	idr_preload_end();
-
+	ret = ida_alloc(&sess_ida, GFP_KERNEL);
 	if (ret < 0) {
-		pr_err("idr_alloc() for sess_idr failed\n");
+		pr_err("Session ID allocation failed %d\n", ret);
 		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		kfree(sess);
-		return -ENOMEM;
+		goto free_sess;
 	}
 
+	sess->session_index = ret;
 	sess->creation_time = get_jiffies_64();
 	/*
 	 * The FFP CmdSN window values will be allocated from the TPG's
@@ -365,20 +358,26 @@ static int iscsi_login_zero_tsih_s1(
 				ISCSI_LOGIN_STATUS_NO_RESOURCES);
 		pr_err("Unable to allocate memory for"
 				" struct iscsi_sess_ops.\n");
-		kfree(sess);
-		return -ENOMEM;
+		goto free_id;
 	}
 
 	sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);
 	if (IS_ERR(sess->se_sess)) {
 		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		kfree(sess->sess_ops);
-		kfree(sess);
-		return -ENOMEM;
+		goto free_ops;
 	}
 
 	return 0;
+
+free_ops:
+	kfree(sess->sess_ops);
+free_id:
+	ida_free(&sess_ida, sess->session_index);
+free_sess:
+	kfree(sess);
+	conn->sess = NULL;
+	return -ENOMEM;
 }
 
 static int iscsi_login_zero_tsih_s2(
@@ -1161,13 +1160,9 @@ void iscsi_target_login_sess_out(struct iscsi_conn *conn,
 				   ISCSI_LOGIN_STATUS_INIT_ERR);
 	if (!zero_tsih || !conn->sess)
 		goto old_sess_out;
-	if (conn->sess->se_sess)
-		transport_free_session(conn->sess->se_sess);
-	if (conn->sess->session_index != 0) {
-		spin_lock_bh(&sess_idr_lock);
-		idr_remove(&sess_idr, conn->sess->session_index);
-		spin_unlock_bh(&sess_idr_lock);
-	}
+
+	transport_free_session(conn->sess->se_sess);
+	ida_free(&sess_ida, conn->sess->session_index);
 	kfree(conn->sess->sess_ops);
 	kfree(conn->sess);
 	conn->sess = NULL;