[PATCHv2 5/5] nvme: split device add from initialization

Keith Busch kbusch at meta.com
Tue Jun 4 11:59:08 PDT 2024


From: Keith Busch <kbusch at kernel.org>

Combining both creates an ambiguous cleanup scenario for the caller if
an error is returned: does the device reference need to be dropped or
did the error occur before the device was initialized? If an error
occurs after the device is added, then the existing cleanup routines
will leak memory.

Furthermore, the nvme core is taking it upon itself to free the device's
kobj.name under certain conditions rather than go the the core device
API. We shouldn't be peaking into these implementation details.

Split the device initialization from the addition to make it easier to
know the error handling actions, fix the existing memory leaks, and stop
the device layering violations.

Link: https://lore.kernel.org/linux-nvme/c4050a37-ecc9-462c-9772-65e25166f439@grimberg.me/
Signed-off-by: Keith Busch <kbusch at kernel.org>
---
 drivers/nvme/host/apple.c  |  5 ++++
 drivers/nvme/host/core.c   | 58 +++++++++++++++++++++++---------------
 drivers/nvme/host/fc.c     |  5 ++++
 drivers/nvme/host/nvme.h   |  1 +
 drivers/nvme/host/pci.c    |  5 ++++
 drivers/nvme/host/rdma.c   |  5 ++++
 drivers/nvme/host/tcp.c    |  5 ++++
 drivers/nvme/target/loop.c |  5 ++++
 8 files changed, 66 insertions(+), 23 deletions(-)

diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c
index d3384aecc0d39..9760c97bc8f19 100644
--- a/drivers/nvme/host/apple.c
+++ b/drivers/nvme/host/apple.c
@@ -1531,6 +1531,10 @@ static int apple_nvme_probe(struct platform_device *pdev)
 	if (IS_ERR(anv))
 		return PTR_ERR(anv);
 
+	result = nvme_add_ctrl(&anv->ctrl);
+	if (result)
+		goto out_put_ctrl;
+
 	anv->ctrl.admin_q = blk_mq_alloc_queue(&anv->admin_tagset, NULL, NULL);
 	if (IS_ERR(anv->ctrl.admin_q)) {
 		ret = -ENOMEM;
@@ -1545,6 +1549,7 @@ static int apple_nvme_probe(struct platform_device *pdev)
 
 out_uninit_ctrl:
 	nvme_uninit_ctrl(&dev->ctrl);
+out_put_ctrl:
 	nvme_put_ctrl(&dev->ctrl);
 	return ret;
 }
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index f5d150c62955d..070cc4d76b6a4 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4611,6 +4611,9 @@ static void nvme_free_ctrl(struct device *dev)
  * Initialize a NVMe controller structures.  This needs to be called during
  * earliest initialization so that we have the initialized structured around
  * during probing.
+ *
+ * On success, the caller must use the nvme_put_ctrl() to release this when
+ * needed, which also invokes the ops->free_ctrl() callback.
  */
 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 		const struct nvme_ctrl_ops *ops, unsigned long quirks)
@@ -4659,6 +4662,12 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 		goto out;
 	ctrl->instance = ret;
 
+	ret = nvme_auth_init_ctrl(ctrl);
+	if (ret)
+		goto out_release_instance;
+
+	nvme_mpath_init_ctrl(ctrl);
+
 	device_initialize(&ctrl->ctrl_device);
 	ctrl->device = &ctrl->ctrl_device;
 	ctrl->device->devt = MKDEV(MAJOR(nvme_ctrl_base_chr_devt),
@@ -4671,16 +4680,36 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 		ctrl->device->groups = nvme_dev_attr_groups;
 	ctrl->device->release = nvme_free_ctrl;
 	dev_set_drvdata(ctrl->device, ctrl);
+
+	return ret;
+
+out_release_instance:
+	ida_free(&nvme_instance_ida, ctrl->instance);
+out:
+	if (ctrl->discard_page)
+		__free_page(ctrl->discard_page);
+	cleanup_srcu_struct(&ctrl->srcu);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(nvme_init_ctrl);
+
+/*
+ * On success, returns with an elevated controller reference and caller must
+ * use nvme_uninit_ctrl() to properly free resources associated with the ctrl.
+ */
+int nvme_add_ctrl(struct nvme_ctrl *ctrl)
+{
+	int ret;
+
 	ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance);
 	if (ret)
-		goto out_release_instance;
+		return ret;
 
-	nvme_get_ctrl(ctrl);
 	cdev_init(&ctrl->cdev, &nvme_dev_fops);
-	ctrl->cdev.owner = ops->module;
+	ctrl->cdev.owner = ctrl->ops->module;
 	ret = cdev_device_add(&ctrl->cdev, ctrl->device);
 	if (ret)
-		goto out_free_name;
+		return ret;
 
 	/*
 	 * Initialize latency tolerance controls.  The sysfs files won't
@@ -4691,28 +4720,11 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 		min(default_ps_max_latency_us, (unsigned long)S32_MAX));
 
 	nvme_fault_inject_init(&ctrl->fault_inject, dev_name(ctrl->device));
-	nvme_mpath_init_ctrl(ctrl);
-	ret = nvme_auth_init_ctrl(ctrl);
-	if (ret)
-		goto out_free_cdev;
+	nvme_get_ctrl(ctrl);
 
 	return 0;
-out_free_cdev:
-	nvme_fault_inject_fini(&ctrl->fault_inject);
-	dev_pm_qos_hide_latency_tolerance(ctrl->device);
-	cdev_device_del(&ctrl->cdev, ctrl->device);
-out_free_name:
-	nvme_put_ctrl(ctrl);
-	kfree_const(ctrl->device->kobj.name);
-out_release_instance:
-	ida_free(&nvme_instance_ida, ctrl->instance);
-out:
-	if (ctrl->discard_page)
-		__free_page(ctrl->discard_page);
-	cleanup_srcu_struct(&ctrl->srcu);
-	return ret;
 }
-EXPORT_SYMBOL_GPL(nvme_init_ctrl);
+EXPORT_SYMBOL_GPL(nvme_add_ctrl);
 
 /* let I/O to all namespaces fail in preparation for surprise removal */
 void nvme_mark_namespaces_dead(struct nvme_ctrl *ctrl)
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index c52446013388f..d5a383766b34d 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -3563,6 +3563,10 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
 	if (IS_ERR(ctrl))
 		return ERR_CAST(ctrl);
 
+	ret = nvme_add_ctrl(&ctrl->ctrl);
+	if (ret)
+		goto out_put_ctrl;
+
 	ret = nvme_alloc_admin_tag_set(&ctrl->ctrl, &ctrl->admin_tag_set,
 			&nvme_fc_admin_mq_ops,
 			struct_size_t(struct nvme_fcp_op_w_sgl, priv,
@@ -3607,6 +3611,7 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
 	/* initiate nvme ctrl ref counting teardown */
 	nvme_uninit_ctrl(&ctrl->ctrl);
 
+out_put_ctrl:
 	/* Remove core ctrl ref. */
 	nvme_put_ctrl(&ctrl->ctrl);
 
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index f3a41133ac3f9..9693490680866 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -792,6 +792,7 @@ int nvme_disable_ctrl(struct nvme_ctrl *ctrl, bool shutdown);
 int nvme_enable_ctrl(struct nvme_ctrl *ctrl);
 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 		const struct nvme_ctrl_ops *ops, unsigned long quirks);
+int nvme_add_ctrl(struct nvme_ctrl *ctrl);
 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 102a9fb0c65ff..c92125b0238d4 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3015,6 +3015,10 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (IS_ERR(dev))
 		return PTR_ERR(dev);
 
+	result = nvme_add_ctrl(&dev->ctrl);
+	if (result)
+		goto out_put_ctrl;
+
 	result = nvme_dev_map(dev);
 	if (result)
 		goto out_uninit_ctrl;
@@ -3101,6 +3105,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	nvme_dev_unmap(dev);
 out_uninit_ctrl:
 	nvme_uninit_ctrl(&dev->ctrl);
+out_put_ctrl:
 	nvme_put_ctrl(&dev->ctrl);
 	return result;
 }
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 94d4f3dbac6b6..5c44c7c5c688c 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -2323,6 +2323,10 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
 	if (IS_ERR(ctrl))
 		return ERR_CAST(ctrl);
 
+	ret = nvme_add_ctrl(&ctrl->ctrl);
+	if (ret)
+		goto out_put_ctrl;
+
 	changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);
 	WARN_ON_ONCE(!changed);
 
@@ -2341,6 +2345,7 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
 
 out_uninit_ctrl:
 	nvme_uninit_ctrl(&ctrl->ctrl);
+out_put_ctrl:
 	nvme_put_ctrl(&ctrl->ctrl);
 	if (ret > 0)
 		ret = -EIO;
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 5ee3bbc67f411..3be67c98c906e 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -2779,6 +2779,10 @@ static struct nvme_ctrl *nvme_tcp_create_ctrl(struct device *dev,
 	if (IS_ERR(ctrl))
 		return ERR_CAST(ctrl);
 
+	ret = nvme_add_ctrl(&ctrl->ctrl);
+	if (ret)
+		goto out_put_ctrl;
+
 	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
 		WARN_ON_ONCE(1);
 		ret = -EINTR;
@@ -2800,6 +2804,7 @@ static struct nvme_ctrl *nvme_tcp_create_ctrl(struct device *dev,
 
 out_uninit_ctrl:
 	nvme_uninit_ctrl(&ctrl->ctrl);
+out_put_ctrl:
 	nvme_put_ctrl(&ctrl->ctrl);
 	if (ret > 0)
 		ret = -EIO;
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index e589915ddef85..e32790d8fc260 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -555,6 +555,10 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
 		goto out;
 	}
 
+	ret = nvme_add_ctrl(&ctrl->ctrl);
+	if (ret)
+		goto out_put_ctrl;
+
 	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING))
 		WARN_ON_ONCE(1);
 
@@ -611,6 +615,7 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
 	kfree(ctrl->queues);
 out_uninit_ctrl:
 	nvme_uninit_ctrl(&ctrl->ctrl);
+out_put_ctrl:
 	nvme_put_ctrl(&ctrl->ctrl);
 out:
 	if (ret > 0)
-- 
2.43.0




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