Commit 523634db authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'libnvdimm-fixes-5.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 

Pull libnvdimm fixes from Dan Williams:
 "A collection of locking and async operations fixes for v5.3-rc2. These
  had been soaking in a branch targeting the merge window, but missed
  due to a regression hunt. This fixed up version has otherwise been in
  -next this past week with no reported issues.

  In order to gain confidence in the locking changes the pull also
  includes a debug / instrumentation patch to enable lockdep coverage
  for libnvdimm subsystem operations that depend on the device_lock for
  exclusion. As mentioned in the changelog it is a hack, but it works
  and documents the locking expectations of the sub-system in a way that
  others can use lockdep to verify. The driver core touches got an ack
  from Greg.

  Summary:

   - Fix duplicate device_unregister() calls (multiple threads competing
     to do unregister work when scheduling device removal from a sysfs
     attribute of the self-same device).

   - Fix badblocks registration order bug. Ensure region badblocks are
     initialized in advance of namespace registration.

   - Fix a deadlock between the bus lock and probe operations.

   - Export device-core infrastructure to coordinate async operations
     via the device ->dead state.

   - Add device-core infrastructure to validate device_lock() usage with
     lockdep"

* tag 'libnvdimm-fixes-5.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  driver-core, libnvdimm: Let device subsystems add local lockdep coverage
  libnvdimm/bus: Fix wait_nvdimm_bus_probe_idle() ABBA deadlock
  libnvdimm/bus: Stop holding nvdimm_bus_list_mutex over __nd_ioctl()
  libnvdimm/bus: Prepare the nd_ioctl() path to be re-entrant
  libnvdimm/region: Register badblocks before namespaces
  libnvdimm/bus: Prevent duplicate device_unregister() calls
  drivers/base: Introduce kill_device()
parents 5168afe6 87a30e1f

drivers/acpi/nfit/core.c

+14 −14
Original line number Diff line number Diff line
@@ -1282,7 +1282,7 @@ static ssize_t hw_error_scrub_store(struct device *dev, 
	if (rc)

		return rc;



	device_lock(dev);

	nfit_device_lock(dev);

	nd_desc = dev_get_drvdata(dev);

	if (nd_desc) {

		struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
@@ -1299,7 +1299,7 @@ static ssize_t hw_error_scrub_store(struct device *dev, 
			break;

		}

	}

	device_unlock(dev);

	nfit_device_unlock(dev);

	if (rc)

		return rc;

	return size;
@@ -1319,7 +1319,7 @@ static ssize_t scrub_show(struct device *dev, 
	ssize_t rc = -ENXIO;

	bool busy;



	device_lock(dev);

	nfit_device_lock(dev);

	nd_desc = dev_get_drvdata(dev);

	if (!nd_desc) {

		device_unlock(dev);
@@ -1339,7 +1339,7 @@ static ssize_t scrub_show(struct device *dev, 
	}



	mutex_unlock(&acpi_desc->init_mutex);

	device_unlock(dev);

	nfit_device_unlock(dev);

	return rc;

}
@@ -1356,14 +1356,14 @@ static ssize_t scrub_store(struct device *dev, 
	if (val != 1)

		return -EINVAL;



	device_lock(dev);

	nfit_device_lock(dev);

	nd_desc = dev_get_drvdata(dev);

	if (nd_desc) {

		struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);



		rc = acpi_nfit_ars_rescan(acpi_desc, ARS_REQ_LONG);

	}

	device_unlock(dev);

	nfit_device_unlock(dev);

	if (rc)

		return rc;

	return size;
@@ -1749,9 +1749,9 @@ static void acpi_nvdimm_notify(acpi_handle handle, u32 event, void *data) 
	struct acpi_device *adev = data;

	struct device *dev = &adev->dev;



	device_lock(dev->parent);

	nfit_device_lock(dev->parent);

	__acpi_nvdimm_notify(dev, event);

	device_unlock(dev->parent);

	nfit_device_unlock(dev->parent);

}



static bool acpi_nvdimm_has_method(struct acpi_device *adev, char *method)
@@ -3457,8 +3457,8 @@ static int acpi_nfit_flush_probe(struct nvdimm_bus_descriptor *nd_desc) 
	struct device *dev = acpi_desc->dev;



	/* Bounce the device lock to flush acpi_nfit_add / acpi_nfit_notify */

	device_lock(dev);

	device_unlock(dev);

	nfit_device_lock(dev);

	nfit_device_unlock(dev);



	/* Bounce the init_mutex to complete initial registration */

	mutex_lock(&acpi_desc->init_mutex);
@@ -3602,8 +3602,8 @@ void acpi_nfit_shutdown(void *data) 
	 * acpi_nfit_ars_rescan() submissions have had a chance to

	 * either submit or see ->cancel set.

	 */

	device_lock(bus_dev);

	device_unlock(bus_dev);

	nfit_device_lock(bus_dev);

	nfit_device_unlock(bus_dev);



	flush_workqueue(nfit_wq);

}
@@ -3746,9 +3746,9 @@ EXPORT_SYMBOL_GPL(__acpi_nfit_notify); 


static void acpi_nfit_notify(struct acpi_device *adev, u32 event)

{

	device_lock(&adev->dev);

	nfit_device_lock(&adev->dev);

	__acpi_nfit_notify(&adev->dev, adev->handle, event);

	device_unlock(&adev->dev);

	nfit_device_unlock(&adev->dev);

}



static const struct acpi_device_id acpi_nfit_ids[] = {

drivers/acpi/nfit/nfit.h

+24 −0
Original line number Diff line number Diff line
@@ -312,6 +312,30 @@ static inline struct acpi_nfit_desc *to_acpi_desc( 
	return container_of(nd_desc, struct acpi_nfit_desc, nd_desc);

}



#ifdef CONFIG_PROVE_LOCKING

static inline void nfit_device_lock(struct device *dev)

{

	device_lock(dev);

	mutex_lock(&dev->lockdep_mutex);

}



static inline void nfit_device_unlock(struct device *dev)

{

	mutex_unlock(&dev->lockdep_mutex);

	device_unlock(dev);

}

#else

static inline void nfit_device_lock(struct device *dev)

{

	device_lock(dev);

}



static inline void nfit_device_unlock(struct device *dev)

{

	device_unlock(dev);

}

#endif



const guid_t *to_nfit_uuid(enum nfit_uuids id);

int acpi_nfit_init(struct acpi_nfit_desc *acpi_desc, void *nfit, acpi_size sz);

void acpi_nfit_shutdown(void *data);

drivers/base/core.c

+22 −8
Original line number Diff line number Diff line
@@ -1663,6 +1663,9 @@ void device_initialize(struct device *dev) 
	kobject_init(&dev->kobj, &device_ktype);

	INIT_LIST_HEAD(&dev->dma_pools);

	mutex_init(&dev->mutex);

#ifdef CONFIG_PROVE_LOCKING

	mutex_init(&dev->lockdep_mutex);

#endif

	lockdep_set_novalidate_class(&dev->mutex);

	spin_lock_init(&dev->devres_lock);

	INIT_LIST_HEAD(&dev->devres_head);
@@ -2211,6 +2214,24 @@ void put_device(struct device *dev) 
}

EXPORT_SYMBOL_GPL(put_device);



bool kill_device(struct device *dev)

{

	/*

	 * Require the device lock and set the "dead" flag to guarantee that

	 * the update behavior is consistent with the other bitfields near

	 * it and that we cannot have an asynchronous probe routine trying

	 * to run while we are tearing out the bus/class/sysfs from

	 * underneath the device.

	 */

	lockdep_assert_held(&dev->mutex);



	if (dev->p->dead)

		return false;

	dev->p->dead = true;

	return true;

}

EXPORT_SYMBOL_GPL(kill_device);



/**

 * device_del - delete device from system.

 * @dev: device.
@@ -2230,15 +2251,8 @@ void device_del(struct device *dev) 
	struct kobject *glue_dir = NULL;

	struct class_interface *class_intf;



	/*

	 * Hold the device lock and set the "dead" flag to guarantee that

	 * the update behavior is consistent with the other bitfields near

	 * it and that we cannot have an asynchronous probe routine trying

	 * to run while we are tearing out the bus/class/sysfs from

	 * underneath the device.

	 */

	device_lock(dev);

	dev->p->dead = true;

	kill_device(dev);

	device_unlock(dev);



	/* Notify clients of device removal.  This call must come

drivers/nvdimm/btt_devs.c

+8 −8
Original line number Diff line number Diff line
@@ -62,14 +62,14 @@ static ssize_t sector_size_store(struct device *dev, 
	struct nd_btt *nd_btt = to_nd_btt(dev);

	ssize_t rc;



	device_lock(dev);

	nd_device_lock(dev);

	nvdimm_bus_lock(dev);

	rc = nd_size_select_store(dev, buf, &nd_btt->lbasize,

			btt_lbasize_supported);

	dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,

			buf[len - 1] == '\n' ? "" : "\n");

	nvdimm_bus_unlock(dev);

	device_unlock(dev);

	nd_device_unlock(dev);



	return rc ? rc : len;

}
@@ -91,11 +91,11 @@ static ssize_t uuid_store(struct device *dev, 
	struct nd_btt *nd_btt = to_nd_btt(dev);

	ssize_t rc;



	device_lock(dev);

	nd_device_lock(dev);

	rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len);

	dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,

			buf[len - 1] == '\n' ? "" : "\n");

	device_unlock(dev);

	nd_device_unlock(dev);



	return rc ? rc : len;

}
@@ -120,13 +120,13 @@ static ssize_t namespace_store(struct device *dev, 
	struct nd_btt *nd_btt = to_nd_btt(dev);

	ssize_t rc;



	device_lock(dev);

	nd_device_lock(dev);

	nvdimm_bus_lock(dev);

	rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);

	dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,

			buf[len - 1] == '\n' ? "" : "\n");

	nvdimm_bus_unlock(dev);

	device_unlock(dev);

	nd_device_unlock(dev);



	return rc;

}
@@ -138,14 +138,14 @@ static ssize_t size_show(struct device *dev, 
	struct nd_btt *nd_btt = to_nd_btt(dev);

	ssize_t rc;



	device_lock(dev);

	nd_device_lock(dev);

	if (dev->driver)

		rc = sprintf(buf, "%llu\n", nd_btt->size);

	else {

		/* no size to convey if the btt instance is disabled */

		rc = -ENXIO;

	}

	device_unlock(dev);

	nd_device_unlock(dev);



	return rc;

}

drivers/nvdimm/bus.c

+140 −70
Original line number Diff line number Diff line
@@ -26,7 +26,7 @@ 


int nvdimm_major;

static int nvdimm_bus_major;

static struct class *nd_class;

struct class *nd_class;

static DEFINE_IDA(nd_ida);



static int to_nd_device_type(struct device *dev)
@@ -73,7 +73,7 @@ static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus) 
{

	nvdimm_bus_lock(&nvdimm_bus->dev);

	if (--nvdimm_bus->probe_active == 0)

		wake_up(&nvdimm_bus->probe_wait);

		wake_up(&nvdimm_bus->wait);

	nvdimm_bus_unlock(&nvdimm_bus->dev);

}
@@ -91,7 +91,10 @@ static int nvdimm_bus_probe(struct device *dev) 
			dev->driver->name, dev_name(dev));



	nvdimm_bus_probe_start(nvdimm_bus);

	debug_nvdimm_lock(dev);

	rc = nd_drv->probe(dev);

	debug_nvdimm_unlock(dev);



	if (rc == 0)

		nd_region_probe_success(nvdimm_bus, dev);

	else
@@ -113,8 +116,11 @@ static int nvdimm_bus_remove(struct device *dev) 
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);

	int rc = 0;



	if (nd_drv->remove)

	if (nd_drv->remove) {

		debug_nvdimm_lock(dev);

		rc = nd_drv->remove(dev);

		debug_nvdimm_unlock(dev);

	}

	nd_region_disable(nvdimm_bus, dev);



	dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
@@ -140,7 +146,7 @@ static void nvdimm_bus_shutdown(struct device *dev) 


void nd_device_notify(struct device *dev, enum nvdimm_event event)

{

	device_lock(dev);

	nd_device_lock(dev);

	if (dev->driver) {

		struct nd_device_driver *nd_drv;
@@ -148,7 +154,7 @@ void nd_device_notify(struct device *dev, enum nvdimm_event event) 
		if (nd_drv->notify)

			nd_drv->notify(dev, event);

	}

	device_unlock(dev);

	nd_device_unlock(dev);

}

EXPORT_SYMBOL(nd_device_notify);
@@ -296,7 +302,7 @@ static void nvdimm_bus_release(struct device *dev) 
	kfree(nvdimm_bus);

}



static bool is_nvdimm_bus(struct device *dev)

bool is_nvdimm_bus(struct device *dev)

{

	return dev->release == nvdimm_bus_release;

}
@@ -341,7 +347,7 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent, 
		return NULL;

	INIT_LIST_HEAD(&nvdimm_bus->list);

	INIT_LIST_HEAD(&nvdimm_bus->mapping_list);

	init_waitqueue_head(&nvdimm_bus->probe_wait);

	init_waitqueue_head(&nvdimm_bus->wait);

	nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);

	if (nvdimm_bus->id < 0) {

		kfree(nvdimm_bus);
@@ -426,6 +432,9 @@ static int nd_bus_remove(struct device *dev) 
	list_del_init(&nvdimm_bus->list);

	mutex_unlock(&nvdimm_bus_list_mutex);



	wait_event(nvdimm_bus->wait,

			atomic_read(&nvdimm_bus->ioctl_active) == 0);



	nd_synchronize();

	device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister);
@@ -547,13 +556,38 @@ EXPORT_SYMBOL(nd_device_register); 


void nd_device_unregister(struct device *dev, enum nd_async_mode mode)

{

	bool killed;



	switch (mode) {

	case ND_ASYNC:

		/*

		 * In the async case this is being triggered with the

		 * device lock held and the unregistration work needs to

		 * be moved out of line iff this is thread has won the

		 * race to schedule the deletion.

		 */

		if (!kill_device(dev))

			return;



		get_device(dev);

		async_schedule_domain(nd_async_device_unregister, dev,

				&nd_async_domain);

		break;

	case ND_SYNC:

		/*

		 * In the sync case the device is being unregistered due

		 * to a state change of the parent. Claim the kill state

		 * to synchronize against other unregistration requests,

		 * or otherwise let the async path handle it if the

		 * unregistration was already queued.

		 */

		nd_device_lock(dev);

		killed = kill_device(dev);

		nd_device_unlock(dev);



		if (!killed)

			return;



		nd_synchronize();

		device_unregister(dev);

		break;
@@ -859,10 +893,12 @@ void wait_nvdimm_bus_probe_idle(struct device *dev) 
	do {

		if (nvdimm_bus->probe_active == 0)

			break;

		nvdimm_bus_unlock(&nvdimm_bus->dev);

		wait_event(nvdimm_bus->probe_wait,

		nvdimm_bus_unlock(dev);

		nd_device_unlock(dev);

		wait_event(nvdimm_bus->wait,

				nvdimm_bus->probe_active == 0);

		nvdimm_bus_lock(&nvdimm_bus->dev);

		nd_device_lock(dev);

		nvdimm_bus_lock(dev);

	} while (true);

}
@@ -945,20 +981,19 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, 
		int read_only, unsigned int ioctl_cmd, unsigned long arg)

{

	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;

	static char out_env[ND_CMD_MAX_ENVELOPE];

	static char in_env[ND_CMD_MAX_ENVELOPE];

	const struct nd_cmd_desc *desc = NULL;

	unsigned int cmd = _IOC_NR(ioctl_cmd);

	struct device *dev = &nvdimm_bus->dev;

	void __user *p = (void __user *) arg;

	char *out_env = NULL, *in_env = NULL;

	const char *cmd_name, *dimm_name;

	u32 in_len = 0, out_len = 0;

	unsigned int func = cmd;

	unsigned long cmd_mask;

	struct nd_cmd_pkg pkg;

	int rc, i, cmd_rc;

	void *buf = NULL;

	u64 buf_len = 0;

	void *buf;



	if (nvdimm) {

		desc = nd_cmd_dimm_desc(cmd);
@@ -989,7 +1024,7 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, 
		case ND_CMD_ARS_START:

		case ND_CMD_CLEAR_ERROR:

		case ND_CMD_CALL:

			dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n",

			dev_dbg(dev, "'%s' command while read-only.\n",

					nvdimm ? nvdimm_cmd_name(cmd)

					: nvdimm_bus_cmd_name(cmd));

			return -EPERM;
@@ -998,6 +1033,9 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, 
		}



	/* process an input envelope */

	in_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);

	if (!in_env)

		return -ENOMEM;

	for (i = 0; i < desc->in_num; i++) {

		u32 in_size, copy;
@@ -1005,14 +1043,17 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, 
		if (in_size == UINT_MAX) {

			dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n",

					__func__, dimm_name, cmd_name, i);

			return -ENXIO;

			rc = -ENXIO;

			goto out;

		}

		if (in_len < sizeof(in_env))

			copy = min_t(u32, sizeof(in_env) - in_len, in_size);

		if (in_len < ND_CMD_MAX_ENVELOPE)

			copy = min_t(u32, ND_CMD_MAX_ENVELOPE - in_len, in_size);

		else

			copy = 0;

		if (copy && copy_from_user(&in_env[in_len], p + in_len, copy))

			return -EFAULT;

		if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) {

			rc = -EFAULT;

			goto out;

		}

		in_len += in_size;

	}
@@ -1024,6 +1065,12 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, 
	}



	/* process an output envelope */

	out_env = kzalloc(ND_CMD_MAX_ENVELOPE, GFP_KERNEL);

	if (!out_env) {

		rc = -ENOMEM;

		goto out;

	}



	for (i = 0; i < desc->out_num; i++) {

		u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,

				(u32 *) in_env, (u32 *) out_env, 0);
@@ -1032,15 +1079,18 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, 
		if (out_size == UINT_MAX) {

			dev_dbg(dev, "%s unknown output size cmd: %s field: %d\n",

					dimm_name, cmd_name, i);

			return -EFAULT;

			rc = -EFAULT;

			goto out;

		}

		if (out_len < sizeof(out_env))

			copy = min_t(u32, sizeof(out_env) - out_len, out_size);

		if (out_len < ND_CMD_MAX_ENVELOPE)

			copy = min_t(u32, ND_CMD_MAX_ENVELOPE - out_len, out_size);

		else

			copy = 0;

		if (copy && copy_from_user(&out_env[out_len],

					p + in_len + out_len, copy))

			return -EFAULT;

					p + in_len + out_len, copy)) {

			rc = -EFAULT;

			goto out;

		}

		out_len += out_size;

	}
@@ -1048,19 +1098,23 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, 
	if (buf_len > ND_IOCTL_MAX_BUFLEN) {

		dev_dbg(dev, "%s cmd: %s buf_len: %llu > %d\n", dimm_name,

				cmd_name, buf_len, ND_IOCTL_MAX_BUFLEN);

		return -EINVAL;

		rc = -EINVAL;

		goto out;

	}



	buf = vmalloc(buf_len);

	if (!buf)

		return -ENOMEM;

	if (!buf) {

		rc = -ENOMEM;

		goto out;

	}



	if (copy_from_user(buf, p, buf_len)) {

		rc = -EFAULT;

		goto out;

	}



	nvdimm_bus_lock(&nvdimm_bus->dev);

	nd_device_lock(dev);

	nvdimm_bus_lock(dev);

	rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, func, buf);

	if (rc)

		goto out_unlock;
@@ -1075,39 +1129,24 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, 
		nvdimm_account_cleared_poison(nvdimm_bus, clear_err->address,

				clear_err->cleared);

	}

	nvdimm_bus_unlock(&nvdimm_bus->dev);



	if (copy_to_user(p, buf, buf_len))

		rc = -EFAULT;



	vfree(buf);

	return rc;



out_unlock:

	nvdimm_bus_unlock(&nvdimm_bus->dev);

	nvdimm_bus_unlock(dev);

	nd_device_unlock(dev);

out:

	kfree(in_env);

	kfree(out_env);

	vfree(buf);

	return rc;

}



static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

{

	long id = (long) file->private_data;

	int rc = -ENXIO, ro;

	struct nvdimm_bus *nvdimm_bus;



	ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);

	mutex_lock(&nvdimm_bus_list_mutex);

	list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {

		if (nvdimm_bus->id == id) {

			rc = __nd_ioctl(nvdimm_bus, NULL, ro, cmd, arg);

			break;

		}

	}

	mutex_unlock(&nvdimm_bus_list_mutex);



	return rc;

}

enum nd_ioctl_mode {

	BUS_IOCTL,

	DIMM_IOCTL,

};



static int match_dimm(struct device *dev, void *data)

{
@@ -1122,31 +1161,62 @@ static int match_dimm(struct device *dev, void *data) 
	return 0;

}



static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg,

		enum nd_ioctl_mode mode)



{

	int rc = -ENXIO, ro;

	struct nvdimm_bus *nvdimm_bus;

	struct nvdimm_bus *nvdimm_bus, *found = NULL;

	long id = (long) file->private_data;

	struct nvdimm *nvdimm = NULL;

	int rc, ro;



	ro = ((file->f_flags & O_ACCMODE) == O_RDONLY);

	mutex_lock(&nvdimm_bus_list_mutex);

	list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) {

		struct device *dev = device_find_child(&nvdimm_bus->dev,

				file->private_data, match_dimm);

		struct nvdimm *nvdimm;

		if (mode == DIMM_IOCTL) {

			struct device *dev;



			dev = device_find_child(&nvdimm_bus->dev,

					file->private_data, match_dimm);

			if (!dev)

				continue;



			nvdimm = to_nvdimm(dev);

		rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);

		put_device(dev);

			found = nvdimm_bus;

		} else if (nvdimm_bus->id == id) {

			found = nvdimm_bus;

		}



		if (found) {

			atomic_inc(&nvdimm_bus->ioctl_active);

			break;

		}

	}

	mutex_unlock(&nvdimm_bus_list_mutex);



	if (!found)

		return -ENXIO;



	nvdimm_bus = found;

	rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg);



	if (nvdimm)

		put_device(&nvdimm->dev);

	if (atomic_dec_and_test(&nvdimm_bus->ioctl_active))

		wake_up(&nvdimm_bus->wait);



	return rc;

}



static long bus_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

{

	return nd_ioctl(file, cmd, arg, BUS_IOCTL);

}



static long dimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

{

	return nd_ioctl(file, cmd, arg, DIMM_IOCTL);

}



static int nd_open(struct inode *inode, struct file *file)

{

	long minor = iminor(inode);
@@ -1158,16 +1228,16 @@ static int nd_open(struct inode *inode, struct file *file) 
static const struct file_operations nvdimm_bus_fops = {

	.owner = THIS_MODULE,

	.open = nd_open,

	.unlocked_ioctl = nd_ioctl,

	.compat_ioctl = nd_ioctl,

	.unlocked_ioctl = bus_ioctl,

	.compat_ioctl = bus_ioctl,

	.llseek = noop_llseek,

};



static const struct file_operations nvdimm_fops = {

	.owner = THIS_MODULE,

	.open = nd_open,

	.unlocked_ioctl = nvdimm_ioctl,

	.compat_ioctl = nvdimm_ioctl,

	.unlocked_ioctl = dimm_ioctl,

	.compat_ioctl = dimm_ioctl,

	.llseek = noop_llseek,

};

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