forked from Minki/linux
daa1dee405
Return proper error if class_create() fails. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
726 lines
17 KiB
C
726 lines
17 KiB
C
/*
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* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/vmalloc.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/fcntl.h>
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#include <linux/async.h>
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#include <linux/genhd.h>
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#include <linux/ndctl.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/nd.h>
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#include "nd-core.h"
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#include "nd.h"
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int nvdimm_major;
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static int nvdimm_bus_major;
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static struct class *nd_class;
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static int to_nd_device_type(struct device *dev)
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{
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if (is_nvdimm(dev))
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return ND_DEVICE_DIMM;
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else if (is_nd_pmem(dev))
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return ND_DEVICE_REGION_PMEM;
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else if (is_nd_blk(dev))
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return ND_DEVICE_REGION_BLK;
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else if (is_nd_pmem(dev->parent) || is_nd_blk(dev->parent))
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return nd_region_to_nstype(to_nd_region(dev->parent));
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return 0;
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}
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static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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/*
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* Ensure that region devices always have their numa node set as
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* early as possible.
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*/
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if (is_nd_pmem(dev) || is_nd_blk(dev))
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set_dev_node(dev, to_nd_region(dev)->numa_node);
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return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
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to_nd_device_type(dev));
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}
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static int nvdimm_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct nd_device_driver *nd_drv = to_nd_device_driver(drv);
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return test_bit(to_nd_device_type(dev), &nd_drv->type);
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}
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static struct module *to_bus_provider(struct device *dev)
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{
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/* pin bus providers while regions are enabled */
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if (is_nd_pmem(dev) || is_nd_blk(dev)) {
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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return nvdimm_bus->module;
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}
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return NULL;
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}
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static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus)
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{
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nvdimm_bus_lock(&nvdimm_bus->dev);
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nvdimm_bus->probe_active++;
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nvdimm_bus_unlock(&nvdimm_bus->dev);
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}
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static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus)
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{
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nvdimm_bus_lock(&nvdimm_bus->dev);
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if (--nvdimm_bus->probe_active == 0)
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wake_up(&nvdimm_bus->probe_wait);
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nvdimm_bus_unlock(&nvdimm_bus->dev);
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}
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static int nvdimm_bus_probe(struct device *dev)
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{
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struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
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struct module *provider = to_bus_provider(dev);
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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int rc;
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if (!try_module_get(provider))
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return -ENXIO;
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nvdimm_bus_probe_start(nvdimm_bus);
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rc = nd_drv->probe(dev);
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if (rc == 0)
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nd_region_probe_success(nvdimm_bus, dev);
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else
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nd_region_disable(nvdimm_bus, dev);
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nvdimm_bus_probe_end(nvdimm_bus);
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dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name,
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dev_name(dev), rc);
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if (rc != 0)
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module_put(provider);
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return rc;
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}
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static int nvdimm_bus_remove(struct device *dev)
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{
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struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver);
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struct module *provider = to_bus_provider(dev);
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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int rc;
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rc = nd_drv->remove(dev);
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nd_region_disable(nvdimm_bus, dev);
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dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name,
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dev_name(dev), rc);
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module_put(provider);
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return rc;
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}
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static struct bus_type nvdimm_bus_type = {
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.name = "nd",
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.uevent = nvdimm_bus_uevent,
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.match = nvdimm_bus_match,
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.probe = nvdimm_bus_probe,
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.remove = nvdimm_bus_remove,
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};
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static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
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void nd_synchronize(void)
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{
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async_synchronize_full_domain(&nd_async_domain);
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}
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EXPORT_SYMBOL_GPL(nd_synchronize);
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static void nd_async_device_register(void *d, async_cookie_t cookie)
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{
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struct device *dev = d;
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if (device_add(dev) != 0) {
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dev_err(dev, "%s: failed\n", __func__);
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put_device(dev);
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}
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put_device(dev);
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}
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static void nd_async_device_unregister(void *d, async_cookie_t cookie)
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{
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struct device *dev = d;
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/* flush bus operations before delete */
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nvdimm_bus_lock(dev);
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nvdimm_bus_unlock(dev);
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device_unregister(dev);
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put_device(dev);
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}
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void __nd_device_register(struct device *dev)
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{
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dev->bus = &nvdimm_bus_type;
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get_device(dev);
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async_schedule_domain(nd_async_device_register, dev,
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&nd_async_domain);
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}
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void nd_device_register(struct device *dev)
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{
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device_initialize(dev);
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__nd_device_register(dev);
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}
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EXPORT_SYMBOL(nd_device_register);
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void nd_device_unregister(struct device *dev, enum nd_async_mode mode)
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{
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switch (mode) {
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case ND_ASYNC:
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get_device(dev);
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async_schedule_domain(nd_async_device_unregister, dev,
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&nd_async_domain);
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break;
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case ND_SYNC:
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nd_synchronize();
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device_unregister(dev);
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break;
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}
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}
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EXPORT_SYMBOL(nd_device_unregister);
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/**
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* __nd_driver_register() - register a region or a namespace driver
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* @nd_drv: driver to register
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* @owner: automatically set by nd_driver_register() macro
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* @mod_name: automatically set by nd_driver_register() macro
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*/
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int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner,
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const char *mod_name)
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{
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struct device_driver *drv = &nd_drv->drv;
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if (!nd_drv->type) {
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pr_debug("driver type bitmask not set (%pf)\n",
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__builtin_return_address(0));
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return -EINVAL;
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}
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if (!nd_drv->probe || !nd_drv->remove) {
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pr_debug("->probe() and ->remove() must be specified\n");
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return -EINVAL;
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}
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drv->bus = &nvdimm_bus_type;
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drv->owner = owner;
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drv->mod_name = mod_name;
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return driver_register(drv);
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}
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EXPORT_SYMBOL(__nd_driver_register);
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int nvdimm_revalidate_disk(struct gendisk *disk)
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{
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struct device *dev = disk->driverfs_dev;
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struct nd_region *nd_region = to_nd_region(dev->parent);
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const char *pol = nd_region->ro ? "only" : "write";
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if (nd_region->ro == get_disk_ro(disk))
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return 0;
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dev_info(dev, "%s read-%s, marking %s read-%s\n",
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dev_name(&nd_region->dev), pol, disk->disk_name, pol);
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set_disk_ro(disk, nd_region->ro);
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return 0;
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}
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EXPORT_SYMBOL(nvdimm_revalidate_disk);
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static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n",
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to_nd_device_type(dev));
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}
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static DEVICE_ATTR_RO(modalias);
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static ssize_t devtype_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%s\n", dev->type->name);
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}
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static DEVICE_ATTR_RO(devtype);
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static struct attribute *nd_device_attributes[] = {
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&dev_attr_modalias.attr,
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&dev_attr_devtype.attr,
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NULL,
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};
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/**
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* nd_device_attribute_group - generic attributes for all devices on an nd bus
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*/
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struct attribute_group nd_device_attribute_group = {
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.attrs = nd_device_attributes,
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};
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EXPORT_SYMBOL_GPL(nd_device_attribute_group);
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static ssize_t numa_node_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", dev_to_node(dev));
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}
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static DEVICE_ATTR_RO(numa_node);
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static struct attribute *nd_numa_attributes[] = {
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&dev_attr_numa_node.attr,
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NULL,
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};
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static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
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int n)
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{
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if (!IS_ENABLED(CONFIG_NUMA))
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return 0;
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return a->mode;
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}
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/**
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* nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
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*/
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struct attribute_group nd_numa_attribute_group = {
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.attrs = nd_numa_attributes,
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.is_visible = nd_numa_attr_visible,
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};
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EXPORT_SYMBOL_GPL(nd_numa_attribute_group);
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int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
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{
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dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
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struct device *dev;
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dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus,
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"ndctl%d", nvdimm_bus->id);
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if (IS_ERR(dev)) {
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dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n",
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nvdimm_bus->id, PTR_ERR(dev));
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return PTR_ERR(dev);
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}
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return 0;
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}
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void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus)
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{
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device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id));
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}
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static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = {
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[ND_CMD_IMPLEMENTED] = { },
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[ND_CMD_SMART] = {
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.out_num = 2,
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.out_sizes = { 4, 8, },
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},
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[ND_CMD_SMART_THRESHOLD] = {
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.out_num = 2,
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.out_sizes = { 4, 8, },
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},
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[ND_CMD_DIMM_FLAGS] = {
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.out_num = 2,
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.out_sizes = { 4, 4 },
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},
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[ND_CMD_GET_CONFIG_SIZE] = {
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.out_num = 3,
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.out_sizes = { 4, 4, 4, },
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},
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[ND_CMD_GET_CONFIG_DATA] = {
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.in_num = 2,
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.in_sizes = { 4, 4, },
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.out_num = 2,
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.out_sizes = { 4, UINT_MAX, },
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},
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[ND_CMD_SET_CONFIG_DATA] = {
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.in_num = 3,
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.in_sizes = { 4, 4, UINT_MAX, },
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.out_num = 1,
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.out_sizes = { 4, },
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},
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[ND_CMD_VENDOR] = {
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.in_num = 3,
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.in_sizes = { 4, 4, UINT_MAX, },
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.out_num = 3,
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.out_sizes = { 4, 4, UINT_MAX, },
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},
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};
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const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd)
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{
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if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs))
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return &__nd_cmd_dimm_descs[cmd];
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return NULL;
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}
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EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc);
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static const struct nd_cmd_desc __nd_cmd_bus_descs[] = {
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[ND_CMD_IMPLEMENTED] = { },
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[ND_CMD_ARS_CAP] = {
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.in_num = 2,
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.in_sizes = { 8, 8, },
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.out_num = 2,
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.out_sizes = { 4, 4, },
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},
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[ND_CMD_ARS_START] = {
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.in_num = 4,
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.in_sizes = { 8, 8, 2, 6, },
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.out_num = 1,
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.out_sizes = { 4, },
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},
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[ND_CMD_ARS_STATUS] = {
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.out_num = 2,
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.out_sizes = { 4, UINT_MAX, },
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},
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};
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const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd)
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{
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if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs))
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return &__nd_cmd_bus_descs[cmd];
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return NULL;
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}
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EXPORT_SYMBOL_GPL(nd_cmd_bus_desc);
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u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd,
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const struct nd_cmd_desc *desc, int idx, void *buf)
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{
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if (idx >= desc->in_num)
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return UINT_MAX;
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if (desc->in_sizes[idx] < UINT_MAX)
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return desc->in_sizes[idx];
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if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) {
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struct nd_cmd_set_config_hdr *hdr = buf;
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return hdr->in_length;
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} else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) {
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struct nd_cmd_vendor_hdr *hdr = buf;
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return hdr->in_length;
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}
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return UINT_MAX;
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}
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EXPORT_SYMBOL_GPL(nd_cmd_in_size);
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u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
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const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
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const u32 *out_field)
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{
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if (idx >= desc->out_num)
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return UINT_MAX;
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if (desc->out_sizes[idx] < UINT_MAX)
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return desc->out_sizes[idx];
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if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1)
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return in_field[1];
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else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
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return out_field[1];
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else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 1)
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return ND_CMD_ARS_STATUS_MAX;
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return UINT_MAX;
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}
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EXPORT_SYMBOL_GPL(nd_cmd_out_size);
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void wait_nvdimm_bus_probe_idle(struct device *dev)
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{
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struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
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do {
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if (nvdimm_bus->probe_active == 0)
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break;
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nvdimm_bus_unlock(&nvdimm_bus->dev);
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wait_event(nvdimm_bus->probe_wait,
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nvdimm_bus->probe_active == 0);
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nvdimm_bus_lock(&nvdimm_bus->dev);
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} while (true);
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}
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/* set_config requires an idle interleave set */
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static int nd_cmd_clear_to_send(struct nvdimm *nvdimm, unsigned int cmd)
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{
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struct nvdimm_bus *nvdimm_bus;
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if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA)
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return 0;
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nvdimm_bus = walk_to_nvdimm_bus(&nvdimm->dev);
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wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev);
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if (atomic_read(&nvdimm->busy))
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return -EBUSY;
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return 0;
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}
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static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
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int read_only, unsigned int ioctl_cmd, unsigned long arg)
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{
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struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
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size_t buf_len = 0, in_len = 0, out_len = 0;
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static char out_env[ND_CMD_MAX_ENVELOPE];
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static char in_env[ND_CMD_MAX_ENVELOPE];
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const struct nd_cmd_desc *desc = NULL;
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unsigned int cmd = _IOC_NR(ioctl_cmd);
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void __user *p = (void __user *) arg;
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struct device *dev = &nvdimm_bus->dev;
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const char *cmd_name, *dimm_name;
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unsigned long dsm_mask;
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void *buf;
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int rc, i;
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if (nvdimm) {
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|
desc = nd_cmd_dimm_desc(cmd);
|
|
cmd_name = nvdimm_cmd_name(cmd);
|
|
dsm_mask = nvdimm->dsm_mask ? *(nvdimm->dsm_mask) : 0;
|
|
dimm_name = dev_name(&nvdimm->dev);
|
|
} else {
|
|
desc = nd_cmd_bus_desc(cmd);
|
|
cmd_name = nvdimm_bus_cmd_name(cmd);
|
|
dsm_mask = nd_desc->dsm_mask;
|
|
dimm_name = "bus";
|
|
}
|
|
|
|
if (!desc || (desc->out_num + desc->in_num == 0) ||
|
|
!test_bit(cmd, &dsm_mask))
|
|
return -ENOTTY;
|
|
|
|
/* fail write commands (when read-only) */
|
|
if (read_only)
|
|
switch (ioctl_cmd) {
|
|
case ND_IOCTL_VENDOR:
|
|
case ND_IOCTL_SET_CONFIG_DATA:
|
|
case ND_IOCTL_ARS_START:
|
|
dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n",
|
|
nvdimm ? nvdimm_cmd_name(cmd)
|
|
: nvdimm_bus_cmd_name(cmd));
|
|
return -EPERM;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* process an input envelope */
|
|
for (i = 0; i < desc->in_num; i++) {
|
|
u32 in_size, copy;
|
|
|
|
in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env);
|
|
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;
|
|
}
|
|
if (in_len < sizeof(in_env))
|
|
copy = min_t(u32, sizeof(in_env) - in_len, in_size);
|
|
else
|
|
copy = 0;
|
|
if (copy && copy_from_user(&in_env[in_len], p + in_len, copy))
|
|
return -EFAULT;
|
|
in_len += in_size;
|
|
}
|
|
|
|
/* process an output envelope */
|
|
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);
|
|
u32 copy;
|
|
|
|
if (out_size == UINT_MAX) {
|
|
dev_dbg(dev, "%s:%s unknown output size cmd: %s field: %d\n",
|
|
__func__, dimm_name, cmd_name, i);
|
|
return -EFAULT;
|
|
}
|
|
if (out_len < sizeof(out_env))
|
|
copy = min_t(u32, sizeof(out_env) - out_len, out_size);
|
|
else
|
|
copy = 0;
|
|
if (copy && copy_from_user(&out_env[out_len],
|
|
p + in_len + out_len, copy))
|
|
return -EFAULT;
|
|
out_len += out_size;
|
|
}
|
|
|
|
buf_len = out_len + in_len;
|
|
if (buf_len > ND_IOCTL_MAX_BUFLEN) {
|
|
dev_dbg(dev, "%s:%s cmd: %s buf_len: %zu > %d\n", __func__,
|
|
dimm_name, cmd_name, buf_len,
|
|
ND_IOCTL_MAX_BUFLEN);
|
|
return -EINVAL;
|
|
}
|
|
|
|
buf = vmalloc(buf_len);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(buf, p, buf_len)) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
nvdimm_bus_lock(&nvdimm_bus->dev);
|
|
rc = nd_cmd_clear_to_send(nvdimm, cmd);
|
|
if (rc)
|
|
goto out_unlock;
|
|
|
|
rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len);
|
|
if (rc < 0)
|
|
goto out_unlock;
|
|
if (copy_to_user(p, buf, buf_len))
|
|
rc = -EFAULT;
|
|
out_unlock:
|
|
nvdimm_bus_unlock(&nvdimm_bus->dev);
|
|
out:
|
|
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, read_only;
|
|
struct nvdimm_bus *nvdimm_bus;
|
|
|
|
read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
|
|
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, read_only, cmd, arg);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&nvdimm_bus_list_mutex);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int match_dimm(struct device *dev, void *data)
|
|
{
|
|
long id = (long) data;
|
|
|
|
if (is_nvdimm(dev)) {
|
|
struct nvdimm *nvdimm = to_nvdimm(dev);
|
|
|
|
return nvdimm->id == id;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
int rc = -ENXIO, read_only;
|
|
struct nvdimm_bus *nvdimm_bus;
|
|
|
|
read_only = (O_RDWR != (file->f_flags & O_ACCMODE));
|
|
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 (!dev)
|
|
continue;
|
|
|
|
nvdimm = to_nvdimm(dev);
|
|
rc = __nd_ioctl(nvdimm_bus, nvdimm, read_only, cmd, arg);
|
|
put_device(dev);
|
|
break;
|
|
}
|
|
mutex_unlock(&nvdimm_bus_list_mutex);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int nd_open(struct inode *inode, struct file *file)
|
|
{
|
|
long minor = iminor(inode);
|
|
|
|
file->private_data = (void *) minor;
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations nvdimm_bus_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = nd_open,
|
|
.unlocked_ioctl = nd_ioctl,
|
|
.compat_ioctl = nd_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,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
int __init nvdimm_bus_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = bus_register(&nvdimm_bus_type);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops);
|
|
if (rc < 0)
|
|
goto err_bus_chrdev;
|
|
nvdimm_bus_major = rc;
|
|
|
|
rc = register_chrdev(0, "dimmctl", &nvdimm_fops);
|
|
if (rc < 0)
|
|
goto err_dimm_chrdev;
|
|
nvdimm_major = rc;
|
|
|
|
nd_class = class_create(THIS_MODULE, "nd");
|
|
if (IS_ERR(nd_class)) {
|
|
rc = PTR_ERR(nd_class);
|
|
goto err_class;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_class:
|
|
unregister_chrdev(nvdimm_major, "dimmctl");
|
|
err_dimm_chrdev:
|
|
unregister_chrdev(nvdimm_bus_major, "ndctl");
|
|
err_bus_chrdev:
|
|
bus_unregister(&nvdimm_bus_type);
|
|
|
|
return rc;
|
|
}
|
|
|
|
void nvdimm_bus_exit(void)
|
|
{
|
|
class_destroy(nd_class);
|
|
unregister_chrdev(nvdimm_bus_major, "ndctl");
|
|
unregister_chrdev(nvdimm_major, "dimmctl");
|
|
bus_unregister(&nvdimm_bus_type);
|
|
}
|