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/most/most_cdev.c | 541 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 541 insertions(+) create mode 100644 drivers/most/most_cdev.c (limited to 'drivers/most/most_cdev.c') diff --git a/drivers/most/most_cdev.c b/drivers/most/most_cdev.c new file mode 100644 index 000000000..3722f9abd --- /dev/null +++ b/drivers/most/most_cdev.c @@ -0,0 +1,541 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * cdev.c - Character device component for Mostcore + * + * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CHRDEV_REGION_SIZE 50 + +static struct cdev_component { + dev_t devno; + struct ida minor_id; + unsigned int major; + struct class *class; + struct most_component cc; +} comp; + +struct comp_channel { + wait_queue_head_t wq; + spinlock_t unlink; /* synchronization lock to unlink channels */ + struct cdev cdev; + struct device *dev; + struct mutex io_mutex; + struct most_interface *iface; + struct most_channel_config *cfg; + unsigned int channel_id; + dev_t devno; + size_t mbo_offs; + DECLARE_KFIFO_PTR(fifo, typeof(struct mbo *)); + int access_ref; + struct list_head list; +}; + +#define to_channel(d) container_of(d, struct comp_channel, cdev) +static LIST_HEAD(channel_list); +static DEFINE_SPINLOCK(ch_list_lock); + +static inline bool ch_has_mbo(struct comp_channel *c) +{ + return channel_has_mbo(c->iface, c->channel_id, &comp.cc) > 0; +} + +static inline struct mbo *ch_get_mbo(struct comp_channel *c, struct mbo **mbo) +{ + if (!kfifo_peek(&c->fifo, mbo)) { + *mbo = most_get_mbo(c->iface, c->channel_id, &comp.cc); + if (*mbo) + kfifo_in(&c->fifo, mbo, 1); + } + return *mbo; +} + +static struct comp_channel *get_channel(struct most_interface *iface, int id) +{ + struct comp_channel *c, *tmp; + unsigned long flags; + + spin_lock_irqsave(&ch_list_lock, flags); + list_for_each_entry_safe(c, tmp, &channel_list, list) { + if ((c->iface == iface) && (c->channel_id == id)) { + spin_unlock_irqrestore(&ch_list_lock, flags); + return c; + } + } + spin_unlock_irqrestore(&ch_list_lock, flags); + return NULL; +} + +static void stop_channel(struct comp_channel *c) +{ + struct mbo *mbo; + + while (kfifo_out((struct kfifo *)&c->fifo, &mbo, 1)) + most_put_mbo(mbo); + most_stop_channel(c->iface, c->channel_id, &comp.cc); +} + +static void destroy_cdev(struct comp_channel *c) +{ + unsigned long flags; + + device_destroy(comp.class, c->devno); + cdev_del(&c->cdev); + spin_lock_irqsave(&ch_list_lock, flags); + list_del(&c->list); + spin_unlock_irqrestore(&ch_list_lock, flags); +} + +static void destroy_channel(struct comp_channel *c) +{ + ida_simple_remove(&comp.minor_id, MINOR(c->devno)); + kfifo_free(&c->fifo); + kfree(c); +} + +/** + * comp_open - implements the syscall to open the device + * @inode: inode pointer + * @filp: file pointer + * + * This stores the channel pointer in the private data field of + * the file structure and activates the channel within the core. + */ +static int comp_open(struct inode *inode, struct file *filp) +{ + struct comp_channel *c; + int ret; + + c = to_channel(inode->i_cdev); + filp->private_data = c; + + if (((c->cfg->direction == MOST_CH_RX) && + ((filp->f_flags & O_ACCMODE) != O_RDONLY)) || + ((c->cfg->direction == MOST_CH_TX) && + ((filp->f_flags & O_ACCMODE) != O_WRONLY))) { + return -EACCES; + } + + mutex_lock(&c->io_mutex); + if (!c->dev) { + mutex_unlock(&c->io_mutex); + return -ENODEV; + } + + if (c->access_ref) { + mutex_unlock(&c->io_mutex); + return -EBUSY; + } + + c->mbo_offs = 0; + ret = most_start_channel(c->iface, c->channel_id, &comp.cc); + if (!ret) + c->access_ref = 1; + mutex_unlock(&c->io_mutex); + return ret; +} + +/** + * comp_close - implements the syscall to close the device + * @inode: inode pointer + * @filp: file pointer + * + * This stops the channel within the core. + */ +static int comp_close(struct inode *inode, struct file *filp) +{ + struct comp_channel *c = to_channel(inode->i_cdev); + + mutex_lock(&c->io_mutex); + spin_lock(&c->unlink); + c->access_ref = 0; + spin_unlock(&c->unlink); + if (c->dev) { + stop_channel(c); + mutex_unlock(&c->io_mutex); + } else { + mutex_unlock(&c->io_mutex); + destroy_channel(c); + } + return 0; +} + +/** + * comp_write - implements the syscall to write to the device + * @filp: file pointer + * @buf: pointer to user buffer + * @count: number of bytes to write + * @offset: offset from where to start writing + */ +static ssize_t comp_write(struct file *filp, const char __user *buf, + size_t count, loff_t *offset) +{ + int ret; + size_t to_copy, left; + struct mbo *mbo = NULL; + struct comp_channel *c = filp->private_data; + + mutex_lock(&c->io_mutex); + while (c->dev && !ch_get_mbo(c, &mbo)) { + mutex_unlock(&c->io_mutex); + + if ((filp->f_flags & O_NONBLOCK)) + return -EAGAIN; + if (wait_event_interruptible(c->wq, ch_has_mbo(c) || !c->dev)) + return -ERESTARTSYS; + mutex_lock(&c->io_mutex); + } + + if (unlikely(!c->dev)) { + ret = -ENODEV; + goto unlock; + } + + to_copy = min(count, c->cfg->buffer_size - c->mbo_offs); + left = copy_from_user(mbo->virt_address + c->mbo_offs, buf, to_copy); + if (left == to_copy) { + ret = -EFAULT; + goto unlock; + } + + c->mbo_offs += to_copy - left; + if (c->mbo_offs >= c->cfg->buffer_size || + c->cfg->data_type == MOST_CH_CONTROL || + c->cfg->data_type == MOST_CH_ASYNC) { + kfifo_skip(&c->fifo); + mbo->buffer_length = c->mbo_offs; + c->mbo_offs = 0; + most_submit_mbo(mbo); + } + + ret = to_copy - left; +unlock: + mutex_unlock(&c->io_mutex); + return ret; +} + +/** + * comp_read - implements the syscall to read from the device + * @filp: file pointer + * @buf: pointer to user buffer + * @count: number of bytes to read + * @offset: offset from where to start reading + */ +static ssize_t +comp_read(struct file *filp, char __user *buf, size_t count, loff_t *offset) +{ + size_t to_copy, not_copied, copied; + struct mbo *mbo = NULL; + struct comp_channel *c = filp->private_data; + + mutex_lock(&c->io_mutex); + while (c->dev && !kfifo_peek(&c->fifo, &mbo)) { + mutex_unlock(&c->io_mutex); + if (filp->f_flags & O_NONBLOCK) + return -EAGAIN; + if (wait_event_interruptible(c->wq, + (!kfifo_is_empty(&c->fifo) || + (!c->dev)))) + return -ERESTARTSYS; + mutex_lock(&c->io_mutex); + } + + /* make sure we don't submit to gone devices */ + if (unlikely(!c->dev)) { + mutex_unlock(&c->io_mutex); + return -ENODEV; + } + + to_copy = min_t(size_t, + count, + mbo->processed_length - c->mbo_offs); + + not_copied = copy_to_user(buf, + mbo->virt_address + c->mbo_offs, + to_copy); + + copied = to_copy - not_copied; + + c->mbo_offs += copied; + if (c->mbo_offs >= mbo->processed_length) { + kfifo_skip(&c->fifo); + most_put_mbo(mbo); + c->mbo_offs = 0; + } + mutex_unlock(&c->io_mutex); + return copied; +} + +static __poll_t comp_poll(struct file *filp, poll_table *wait) +{ + struct comp_channel *c = filp->private_data; + __poll_t mask = 0; + + poll_wait(filp, &c->wq, wait); + + mutex_lock(&c->io_mutex); + if (c->cfg->direction == MOST_CH_RX) { + if (!c->dev || !kfifo_is_empty(&c->fifo)) + mask |= EPOLLIN | EPOLLRDNORM; + } else { + if (!c->dev || !kfifo_is_empty(&c->fifo) || ch_has_mbo(c)) + mask |= EPOLLOUT | EPOLLWRNORM; + } + mutex_unlock(&c->io_mutex); + return mask; +} + +/** + * Initialization of struct file_operations + */ +static const struct file_operations channel_fops = { + .owner = THIS_MODULE, + .read = comp_read, + .write = comp_write, + .open = comp_open, + .release = comp_close, + .poll = comp_poll, +}; + +/** + * comp_disconnect_channel - disconnect a channel + * @iface: pointer to interface instance + * @channel_id: channel index + * + * This frees allocated memory and removes the cdev that represents this + * channel in user space. + */ +static int comp_disconnect_channel(struct most_interface *iface, int channel_id) +{ + struct comp_channel *c; + + c = get_channel(iface, channel_id); + if (!c) + return -EINVAL; + + mutex_lock(&c->io_mutex); + spin_lock(&c->unlink); + c->dev = NULL; + spin_unlock(&c->unlink); + destroy_cdev(c); + if (c->access_ref) { + stop_channel(c); + wake_up_interruptible(&c->wq); + mutex_unlock(&c->io_mutex); + } else { + mutex_unlock(&c->io_mutex); + destroy_channel(c); + } + return 0; +} + +/** + * comp_rx_completion - completion handler for rx channels + * @mbo: pointer to buffer object that has completed + * + * This searches for the channel linked to this MBO and stores it in the local + * fifo buffer. + */ +static int comp_rx_completion(struct mbo *mbo) +{ + struct comp_channel *c; + + if (!mbo) + return -EINVAL; + + c = get_channel(mbo->ifp, mbo->hdm_channel_id); + if (!c) + return -EINVAL; + + spin_lock(&c->unlink); + if (!c->access_ref || !c->dev) { + spin_unlock(&c->unlink); + return -ENODEV; + } + kfifo_in(&c->fifo, &mbo, 1); + spin_unlock(&c->unlink); +#ifdef DEBUG_MESG + if (kfifo_is_full(&c->fifo)) + dev_warn(c->dev, "Fifo is full\n"); +#endif + wake_up_interruptible(&c->wq); + return 0; +} + +/** + * comp_tx_completion - completion handler for tx channels + * @iface: pointer to interface instance + * @channel_id: channel index/ID + * + * This wakes sleeping processes in the wait-queue. + */ +static int comp_tx_completion(struct most_interface *iface, int channel_id) +{ + struct comp_channel *c; + + c = get_channel(iface, channel_id); + if (!c) + return -EINVAL; + + if ((channel_id < 0) || (channel_id >= iface->num_channels)) { + dev_warn(c->dev, "Channel ID out of range\n"); + return -EINVAL; + } + + wake_up_interruptible(&c->wq); + return 0; +} + +/** + * comp_probe - probe function of the driver module + * @iface: pointer to interface instance + * @channel_id: channel index/ID + * @cfg: pointer to actual channel configuration + * @name: name of the device to be created + * + * This allocates achannel object and creates the device node in /dev + * + * Returns 0 on success or error code otherwise. + */ +static int comp_probe(struct most_interface *iface, int channel_id, + struct most_channel_config *cfg, char *name, char *args) +{ + struct comp_channel *c; + unsigned long cl_flags; + int retval; + int current_minor; + + if (!cfg || !name) + return -EINVAL; + + c = get_channel(iface, channel_id); + if (c) + return -EEXIST; + + current_minor = ida_simple_get(&comp.minor_id, 0, 0, GFP_KERNEL); + if (current_minor < 0) + return current_minor; + + c = kzalloc(sizeof(*c), GFP_KERNEL); + if (!c) { + retval = -ENOMEM; + goto err_remove_ida; + } + + c->devno = MKDEV(comp.major, current_minor); + cdev_init(&c->cdev, &channel_fops); + c->cdev.owner = THIS_MODULE; + retval = cdev_add(&c->cdev, c->devno, 1); + if (retval < 0) + goto err_free_c; + c->iface = iface; + c->cfg = cfg; + c->channel_id = channel_id; + c->access_ref = 0; + spin_lock_init(&c->unlink); + INIT_KFIFO(c->fifo); + retval = kfifo_alloc(&c->fifo, cfg->num_buffers, GFP_KERNEL); + if (retval) + goto err_del_cdev_and_free_channel; + init_waitqueue_head(&c->wq); + mutex_init(&c->io_mutex); + spin_lock_irqsave(&ch_list_lock, cl_flags); + list_add_tail(&c->list, &channel_list); + spin_unlock_irqrestore(&ch_list_lock, cl_flags); + c->dev = device_create(comp.class, NULL, c->devno, NULL, "%s", name); + + if (IS_ERR(c->dev)) { + retval = PTR_ERR(c->dev); + goto err_free_kfifo_and_del_list; + } + kobject_uevent(&c->dev->kobj, KOBJ_ADD); + return 0; + +err_free_kfifo_and_del_list: + kfifo_free(&c->fifo); + list_del(&c->list); +err_del_cdev_and_free_channel: + cdev_del(&c->cdev); +err_free_c: + kfree(c); +err_remove_ida: + ida_simple_remove(&comp.minor_id, current_minor); + return retval; +} + +static struct cdev_component comp = { + .cc = { + .mod = THIS_MODULE, + .name = "cdev", + .probe_channel = comp_probe, + .disconnect_channel = comp_disconnect_channel, + .rx_completion = comp_rx_completion, + .tx_completion = comp_tx_completion, + }, +}; + +static int __init most_cdev_init(void) +{ + int err; + + comp.class = class_create(THIS_MODULE, "most_cdev"); + if (IS_ERR(comp.class)) + return PTR_ERR(comp.class); + + ida_init(&comp.minor_id); + + err = alloc_chrdev_region(&comp.devno, 0, CHRDEV_REGION_SIZE, "cdev"); + if (err < 0) + goto dest_ida; + comp.major = MAJOR(comp.devno); + err = most_register_component(&comp.cc); + if (err) + goto free_cdev; + err = most_register_configfs_subsys(&comp.cc); + if (err) + goto deregister_comp; + return 0; + +deregister_comp: + most_deregister_component(&comp.cc); +free_cdev: + unregister_chrdev_region(comp.devno, CHRDEV_REGION_SIZE); +dest_ida: + ida_destroy(&comp.minor_id); + class_destroy(comp.class); + return err; +} + +static void __exit most_cdev_exit(void) +{ + struct comp_channel *c, *tmp; + + most_deregister_configfs_subsys(&comp.cc); + most_deregister_component(&comp.cc); + + list_for_each_entry_safe(c, tmp, &channel_list, list) { + destroy_cdev(c); + destroy_channel(c); + } + unregister_chrdev_region(comp.devno, CHRDEV_REGION_SIZE); + ida_destroy(&comp.minor_id); + class_destroy(comp.class); +} + +module_init(most_cdev_init); +module_exit(most_cdev_exit); +MODULE_AUTHOR("Christian Gromm "); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("character device component for mostcore"); -- cgit v1.2.3