From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/mtd/mtd_blkdevs.c | 548 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 548 insertions(+) create mode 100644 drivers/mtd/mtd_blkdevs.c (limited to 'drivers/mtd/mtd_blkdevs.c') diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c new file mode 100644 index 000000000..60b222799 --- /dev/null +++ b/drivers/mtd/mtd_blkdevs.c @@ -0,0 +1,548 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Interface to Linux block layer for MTD 'translation layers'. + * + * Copyright © 2003-2010 David Woodhouse + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "mtdcore.h" + +static LIST_HEAD(blktrans_majors); + +static void blktrans_dev_release(struct kref *kref) +{ + struct mtd_blktrans_dev *dev = + container_of(kref, struct mtd_blktrans_dev, ref); + + put_disk(dev->disk); + blk_mq_free_tag_set(dev->tag_set); + kfree(dev->tag_set); + list_del(&dev->list); + kfree(dev); +} + +static void blktrans_dev_put(struct mtd_blktrans_dev *dev) +{ + kref_put(&dev->ref, blktrans_dev_release); +} + + +static blk_status_t do_blktrans_request(struct mtd_blktrans_ops *tr, + struct mtd_blktrans_dev *dev, + struct request *req) +{ + struct req_iterator iter; + struct bio_vec bvec; + unsigned long block, nsect; + char *buf; + + block = blk_rq_pos(req) << 9 >> tr->blkshift; + nsect = blk_rq_cur_bytes(req) >> tr->blkshift; + + switch (req_op(req)) { + case REQ_OP_FLUSH: + if (tr->flush(dev)) + return BLK_STS_IOERR; + return BLK_STS_OK; + case REQ_OP_DISCARD: + if (tr->discard(dev, block, nsect)) + return BLK_STS_IOERR; + return BLK_STS_OK; + case REQ_OP_READ: + buf = kmap(bio_page(req->bio)) + bio_offset(req->bio); + for (; nsect > 0; nsect--, block++, buf += tr->blksize) { + if (tr->readsect(dev, block, buf)) { + kunmap(bio_page(req->bio)); + return BLK_STS_IOERR; + } + } + kunmap(bio_page(req->bio)); + + rq_for_each_segment(bvec, req, iter) + flush_dcache_page(bvec.bv_page); + return BLK_STS_OK; + case REQ_OP_WRITE: + if (!tr->writesect) + return BLK_STS_IOERR; + + rq_for_each_segment(bvec, req, iter) + flush_dcache_page(bvec.bv_page); + + buf = kmap(bio_page(req->bio)) + bio_offset(req->bio); + for (; nsect > 0; nsect--, block++, buf += tr->blksize) { + if (tr->writesect(dev, block, buf)) { + kunmap(bio_page(req->bio)); + return BLK_STS_IOERR; + } + } + kunmap(bio_page(req->bio)); + return BLK_STS_OK; + default: + return BLK_STS_IOERR; + } +} + +int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev) +{ + return dev->bg_stop; +} +EXPORT_SYMBOL_GPL(mtd_blktrans_cease_background); + +static struct request *mtd_next_request(struct mtd_blktrans_dev *dev) +{ + struct request *rq; + + rq = list_first_entry_or_null(&dev->rq_list, struct request, queuelist); + if (rq) { + list_del_init(&rq->queuelist); + blk_mq_start_request(rq); + return rq; + } + + return NULL; +} + +static void mtd_blktrans_work(struct mtd_blktrans_dev *dev) + __releases(&dev->queue_lock) + __acquires(&dev->queue_lock) +{ + struct mtd_blktrans_ops *tr = dev->tr; + struct request *req = NULL; + int background_done = 0; + + while (1) { + blk_status_t res; + + dev->bg_stop = false; + if (!req && !(req = mtd_next_request(dev))) { + if (tr->background && !background_done) { + spin_unlock_irq(&dev->queue_lock); + mutex_lock(&dev->lock); + tr->background(dev); + mutex_unlock(&dev->lock); + spin_lock_irq(&dev->queue_lock); + /* + * Do background processing just once per idle + * period. + */ + background_done = !dev->bg_stop; + continue; + } + break; + } + + spin_unlock_irq(&dev->queue_lock); + + mutex_lock(&dev->lock); + res = do_blktrans_request(dev->tr, dev, req); + mutex_unlock(&dev->lock); + + if (!blk_update_request(req, res, blk_rq_cur_bytes(req))) { + __blk_mq_end_request(req, res); + req = NULL; + } + + background_done = 0; + cond_resched(); + spin_lock_irq(&dev->queue_lock); + } +} + +static blk_status_t mtd_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) +{ + struct mtd_blktrans_dev *dev; + + dev = hctx->queue->queuedata; + if (!dev) { + blk_mq_start_request(bd->rq); + return BLK_STS_IOERR; + } + + spin_lock_irq(&dev->queue_lock); + list_add_tail(&bd->rq->queuelist, &dev->rq_list); + mtd_blktrans_work(dev); + spin_unlock_irq(&dev->queue_lock); + + return BLK_STS_OK; +} + +static int blktrans_open(struct block_device *bdev, fmode_t mode) +{ + struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data; + int ret = 0; + + kref_get(&dev->ref); + + mutex_lock(&dev->lock); + + if (dev->open) + goto unlock; + + __module_get(dev->tr->owner); + + if (!dev->mtd) + goto unlock; + + if (dev->tr->open) { + ret = dev->tr->open(dev); + if (ret) + goto error_put; + } + + ret = __get_mtd_device(dev->mtd); + if (ret) + goto error_release; + dev->file_mode = mode; + +unlock: + dev->open++; + mutex_unlock(&dev->lock); + return ret; + +error_release: + if (dev->tr->release) + dev->tr->release(dev); +error_put: + module_put(dev->tr->owner); + mutex_unlock(&dev->lock); + blktrans_dev_put(dev); + return ret; +} + +static void blktrans_release(struct gendisk *disk, fmode_t mode) +{ + struct mtd_blktrans_dev *dev = disk->private_data; + + mutex_lock(&dev->lock); + + if (--dev->open) + goto unlock; + + module_put(dev->tr->owner); + + if (dev->mtd) { + if (dev->tr->release) + dev->tr->release(dev); + __put_mtd_device(dev->mtd); + } +unlock: + mutex_unlock(&dev->lock); + blktrans_dev_put(dev); +} + +static int blktrans_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data; + int ret = -ENXIO; + + mutex_lock(&dev->lock); + + if (!dev->mtd) + goto unlock; + + ret = dev->tr->getgeo ? dev->tr->getgeo(dev, geo) : -ENOTTY; +unlock: + mutex_unlock(&dev->lock); + return ret; +} + +static const struct block_device_operations mtd_block_ops = { + .owner = THIS_MODULE, + .open = blktrans_open, + .release = blktrans_release, + .getgeo = blktrans_getgeo, +}; + +static const struct blk_mq_ops mtd_mq_ops = { + .queue_rq = mtd_queue_rq, +}; + +int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new) +{ + struct mtd_blktrans_ops *tr = new->tr; + struct mtd_blktrans_dev *d; + int last_devnum = -1; + struct gendisk *gd; + int ret; + + lockdep_assert_held(&mtd_table_mutex); + + list_for_each_entry(d, &tr->devs, list) { + if (new->devnum == -1) { + /* Use first free number */ + if (d->devnum != last_devnum+1) { + /* Found a free devnum. Plug it in here */ + new->devnum = last_devnum+1; + list_add_tail(&new->list, &d->list); + goto added; + } + } else if (d->devnum == new->devnum) { + /* Required number taken */ + return -EBUSY; + } else if (d->devnum > new->devnum) { + /* Required number was free */ + list_add_tail(&new->list, &d->list); + goto added; + } + last_devnum = d->devnum; + } + + ret = -EBUSY; + if (new->devnum == -1) + new->devnum = last_devnum+1; + + /* Check that the device and any partitions will get valid + * minor numbers and that the disk naming code below can cope + * with this number. */ + if (new->devnum > (MINORMASK >> tr->part_bits) || + (tr->part_bits && new->devnum >= 27 * 26)) + return ret; + + list_add_tail(&new->list, &tr->devs); + added: + + mutex_init(&new->lock); + kref_init(&new->ref); + if (!tr->writesect) + new->readonly = 1; + + ret = -ENOMEM; + new->tag_set = kzalloc(sizeof(*new->tag_set), GFP_KERNEL); + if (!new->tag_set) + goto out_list_del; + + ret = blk_mq_alloc_sq_tag_set(new->tag_set, &mtd_mq_ops, 2, + BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING); + if (ret) + goto out_kfree_tag_set; + + /* Create gendisk */ + gd = blk_mq_alloc_disk(new->tag_set, new); + if (IS_ERR(gd)) { + ret = PTR_ERR(gd); + goto out_free_tag_set; + } + + new->disk = gd; + new->rq = new->disk->queue; + gd->private_data = new; + gd->major = tr->major; + gd->first_minor = (new->devnum) << tr->part_bits; + gd->minors = 1 << tr->part_bits; + gd->fops = &mtd_block_ops; + + if (tr->part_bits) { + if (new->devnum < 26) + snprintf(gd->disk_name, sizeof(gd->disk_name), + "%s%c", tr->name, 'a' + new->devnum); + else + snprintf(gd->disk_name, sizeof(gd->disk_name), + "%s%c%c", tr->name, + 'a' - 1 + new->devnum / 26, + 'a' + new->devnum % 26); + } else { + snprintf(gd->disk_name, sizeof(gd->disk_name), + "%s%d", tr->name, new->devnum); + gd->flags |= GENHD_FL_NO_PART; + } + + set_capacity(gd, ((u64)new->size * tr->blksize) >> 9); + + /* Create the request queue */ + spin_lock_init(&new->queue_lock); + INIT_LIST_HEAD(&new->rq_list); + + if (tr->flush) + blk_queue_write_cache(new->rq, true, false); + + blk_queue_logical_block_size(new->rq, tr->blksize); + + blk_queue_flag_set(QUEUE_FLAG_NONROT, new->rq); + blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, new->rq); + + if (tr->discard) { + blk_queue_max_discard_sectors(new->rq, UINT_MAX); + new->rq->limits.discard_granularity = tr->blksize; + } + + gd->queue = new->rq; + + if (new->readonly) + set_disk_ro(gd, 1); + + ret = device_add_disk(&new->mtd->dev, gd, NULL); + if (ret) + goto out_cleanup_disk; + + if (new->disk_attributes) { + ret = sysfs_create_group(&disk_to_dev(gd)->kobj, + new->disk_attributes); + WARN_ON(ret); + } + return 0; + +out_cleanup_disk: + put_disk(new->disk); +out_free_tag_set: + blk_mq_free_tag_set(new->tag_set); +out_kfree_tag_set: + kfree(new->tag_set); +out_list_del: + list_del(&new->list); + return ret; +} + +int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old) +{ + unsigned long flags; + + lockdep_assert_held(&mtd_table_mutex); + + if (old->disk_attributes) + sysfs_remove_group(&disk_to_dev(old->disk)->kobj, + old->disk_attributes); + + /* Stop new requests to arrive */ + del_gendisk(old->disk); + + /* Kill current requests */ + spin_lock_irqsave(&old->queue_lock, flags); + old->rq->queuedata = NULL; + spin_unlock_irqrestore(&old->queue_lock, flags); + + /* freeze+quiesce queue to ensure all requests are flushed */ + blk_mq_freeze_queue(old->rq); + blk_mq_quiesce_queue(old->rq); + blk_mq_unquiesce_queue(old->rq); + blk_mq_unfreeze_queue(old->rq); + + /* If the device is currently open, tell trans driver to close it, + then put mtd device, and don't touch it again */ + mutex_lock(&old->lock); + if (old->open) { + if (old->tr->release) + old->tr->release(old); + __put_mtd_device(old->mtd); + } + + old->mtd = NULL; + + mutex_unlock(&old->lock); + blktrans_dev_put(old); + return 0; +} + +static void blktrans_notify_remove(struct mtd_info *mtd) +{ + struct mtd_blktrans_ops *tr; + struct mtd_blktrans_dev *dev, *next; + + list_for_each_entry(tr, &blktrans_majors, list) + list_for_each_entry_safe(dev, next, &tr->devs, list) + if (dev->mtd == mtd) + tr->remove_dev(dev); +} + +static void blktrans_notify_add(struct mtd_info *mtd) +{ + struct mtd_blktrans_ops *tr; + + if (mtd->type == MTD_ABSENT) + return; + + list_for_each_entry(tr, &blktrans_majors, list) + tr->add_mtd(tr, mtd); +} + +static struct mtd_notifier blktrans_notifier = { + .add = blktrans_notify_add, + .remove = blktrans_notify_remove, +}; + +int register_mtd_blktrans(struct mtd_blktrans_ops *tr) +{ + struct mtd_info *mtd; + int ret; + + /* Register the notifier if/when the first device type is + registered, to prevent the link/init ordering from fucking + us over. */ + if (!blktrans_notifier.list.next) + register_mtd_user(&blktrans_notifier); + + ret = register_blkdev(tr->major, tr->name); + if (ret < 0) { + printk(KERN_WARNING "Unable to register %s block device on major %d: %d\n", + tr->name, tr->major, ret); + return ret; + } + + if (ret) + tr->major = ret; + + tr->blkshift = ffs(tr->blksize) - 1; + + INIT_LIST_HEAD(&tr->devs); + + mutex_lock(&mtd_table_mutex); + list_add(&tr->list, &blktrans_majors); + mtd_for_each_device(mtd) + if (mtd->type != MTD_ABSENT) + tr->add_mtd(tr, mtd); + mutex_unlock(&mtd_table_mutex); + return 0; +} + +int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr) +{ + struct mtd_blktrans_dev *dev, *next; + + mutex_lock(&mtd_table_mutex); + + /* Remove it from the list of active majors */ + list_del(&tr->list); + + list_for_each_entry_safe(dev, next, &tr->devs, list) + tr->remove_dev(dev); + + mutex_unlock(&mtd_table_mutex); + unregister_blkdev(tr->major, tr->name); + + BUG_ON(!list_empty(&tr->devs)); + return 0; +} + +static void __exit mtd_blktrans_exit(void) +{ + /* No race here -- if someone's currently in register_mtd_blktrans + we're screwed anyway. */ + if (blktrans_notifier.list.next) + unregister_mtd_user(&blktrans_notifier); +} + +module_exit(mtd_blktrans_exit); + +EXPORT_SYMBOL_GPL(register_mtd_blktrans); +EXPORT_SYMBOL_GPL(deregister_mtd_blktrans); +EXPORT_SYMBOL_GPL(add_mtd_blktrans_dev); +EXPORT_SYMBOL_GPL(del_mtd_blktrans_dev); + +MODULE_AUTHOR("David Woodhouse "); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Common interface to block layer for MTD 'translation layers'"); -- cgit v1.2.3