/* * Copyright (c) International Business Machines Corp., 2006 * Copyright (c) Nokia Corporation, 2007 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU General Public License for more details. * * Author: Artem Bityutskiy (Битюцкий Артём), * Frank Haverkamp */ /* * This file includes UBI initialization and building of UBI devices. * * When UBI is initialized, it attaches all the MTD devices specified as the * module load parameters or the kernel boot parameters. If MTD devices were * specified, UBI does not attach any MTD device, but it is possible to do * later using the "UBI control device". */ #include #include #include #include #include "ubi.h" /* Maximum length of the 'mtd=' parameter */ #define MTD_PARAM_LEN_MAX 64 /* Maximum value for the number of bad PEBs per 1024 PEBs */ #define MAX_MTD_UBI_BEB_LIMIT 768 /** * struct mtd_dev_param - MTD device parameter description data structure. * @name: MTD character device node path, MTD device name, or MTD device number * string * @vid_hdr_offs: VID header offset * @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs */ struct mtd_dev_param { char name[MTD_PARAM_LEN_MAX]; int vid_hdr_offs; int max_beb_per1024; }; /* MTD devices specification parameters */ #ifdef CONFIG_MTD_UBI_FASTMAP /* UBI module parameter to enable fastmap automatically on non-fastmap images */ static bool fm_autoconvert = 1; #endif /* All UBI devices in system */ struct ubi_device *ubi_devices[UBI_MAX_DEVICES]; /** * ubi_volume_notify - send a volume change notification. * @ubi: UBI device description object * @vol: volume description object of the changed volume * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc) * * This is a helper function which notifies all subscribers about a volume * change event (creation, removal, re-sizing, re-naming, updating). Returns * zero in case of success and a negative error code in case of failure. */ int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype) { int ret = 0; #ifdef CONFIG_MTD_UBI_FASTMAP switch (ntype) { case UBI_VOLUME_ADDED: case UBI_VOLUME_REMOVED: case UBI_VOLUME_RESIZED: case UBI_VOLUME_RENAMED: ret = ubi_update_fastmap(ubi); if (ret) ubi_msg(ubi, "Unable to write a new fastmap: %i", ret); } #endif return ret; } /** * ubi_get_device - get UBI device. * @ubi_num: UBI device number * * This function returns UBI device description object for UBI device number * @ubi_num, or %NULL if the device does not exist. This function increases the * device reference count to prevent removal of the device. In other words, the * device cannot be removed if its reference count is not zero. */ struct ubi_device *ubi_get_device(int ubi_num) { struct ubi_device *ubi; ubi = ubi_devices[ubi_num]; if (!ubi) return NULL; ubi->ref_count++; return ubi; } /** * ubi_put_device - drop an UBI device reference. * @ubi: UBI device description object */ void ubi_put_device(struct ubi_device *ubi) { ubi->ref_count--; } /** * kill_volumes - destroy all user volumes. * @ubi: UBI device description object */ static void kill_volumes(struct ubi_device *ubi) { int i; for (i = 0; i < ubi->vtbl_slots; i++) if (ubi->volumes[i]) ubi_free_volume(ubi, ubi->volumes[i]); } /** * uif_init - initialize user interfaces for an UBI device. * @ubi: UBI device description object * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was * taken, otherwise set to %0 * * This function initializes various user interfaces for an UBI device. If the * initialization fails at an early stage, this function frees all the * resources it allocated, returns an error, and @ref is set to %0. However, * if the initialization fails after the UBI device was registered in the * driver core subsystem, this function takes a reference to @ubi->dev, because * otherwise the release function ('dev_release()') would free whole @ubi * object. The @ref argument is set to %1 in this case. The caller has to put * this reference. * * This function returns zero in case of success and a negative error code in * case of failure. */ static int uif_init(struct ubi_device *ubi, int *ref) { int i, err; *ref = 0; sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num); dev_set_name(&ubi->dev, "%s.ubi", ubi->mtd->cdev.name); ubi->dev.id = DEVICE_ID_SINGLE; ubi->dev.parent = &ubi->mtd->class_dev; err = register_device(&ubi->dev); if (err) goto out_unreg; err = ubi_cdev_add(ubi); if (err) { ubi_err(ubi, "cannot add character device"); goto out_dev; } for (i = 0; i < ubi->vtbl_slots; i++) if (ubi->volumes[i]) { err = ubi_add_volume(ubi, ubi->volumes[i]); if (err) { ubi_err(ubi, "cannot add volume %d", i); goto out_volumes; } } return 0; out_volumes: kill_volumes(ubi); devfs_remove(&ubi->cdev); out_dev: unregister_device(&ubi->dev); out_unreg: ubi_err(ubi, "cannot initialize UBI %s, error %d", ubi->ubi_name, err); return err; } /** * uif_close - close user interfaces for an UBI device. * @ubi: UBI device description object * * Note, since this function un-registers UBI volume device objects (@vol->dev), * the memory allocated voe the volumes is freed as well (in the release * function). */ static void uif_close(struct ubi_device *ubi) { kill_volumes(ubi); unregister_device(&ubi->dev); ubi_cdev_remove(ubi); } /** * ubi_free_internal_volumes - free internal volumes. * @ubi: UBI device description object */ void ubi_free_internal_volumes(struct ubi_device *ubi) { int i; for (i = ubi->vtbl_slots; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) { ubi_eba_replace_table(ubi->volumes[i], NULL); ubi_fastmap_destroy_checkmap(ubi->volumes[i]); kfree(ubi->volumes[i]); } } static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024) { int limit, device_pebs; uint64_t device_size; if (!max_beb_per1024) return 0; /* * Here we are using size of the entire flash chip and * not just the MTD partition size because the maximum * number of bad eraseblocks is a percentage of the * whole device and bad eraseblocks are not fairly * distributed over the flash chip. So the worst case * is that all the bad eraseblocks of the chip are in * the MTD partition we are attaching (ubi->mtd). */ if (ubi->mtd->master) device_size = ubi->mtd->master->size; else device_size = ubi->mtd->size; device_pebs = mtd_div_by_eb(device_size, ubi->mtd); limit = mult_frac(device_pebs, max_beb_per1024, 1024); /* Round it up */ if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs) limit += 1; return limit; } /** * io_init - initialize I/O sub-system for a given UBI device. * @ubi: UBI device description object * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs * * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are * assumed: * o EC header is always at offset zero - this cannot be changed; * o VID header starts just after the EC header at the closest address * aligned to @io->hdrs_min_io_size; * o data starts just after the VID header at the closest address aligned to * @io->min_io_size * * This function returns zero in case of success and a negative error code in * case of failure. */ static int io_init(struct ubi_device *ubi, int max_beb_per1024) { dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb)); dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry)); if (ubi->mtd->numeraseregions != 0) { /* * Some flashes have several erase regions. Different regions * may have different eraseblock size and other * characteristics. It looks like mostly multi-region flashes * have one "main" region and one or more small regions to * store boot loader code or boot parameters or whatever. I * guess we should just pick the largest region. But this is * not implemented. */ ubi_err(ubi, "multiple regions, not implemented"); return -EINVAL; } if (ubi->vid_hdr_offset < 0) return -EINVAL; /* * Note, in this implementation we support MTD devices with 0x7FFFFFFF * physical eraseblocks maximum. */ ubi->peb_size = ubi->mtd->erasesize; ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd); ubi->flash_size = ubi->mtd->size; if (mtd_can_have_bb(ubi->mtd)) { ubi->bad_allowed = 1; ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024); } if (ubi->mtd->type == MTD_NORFLASH) { ubi_assert(ubi->mtd->writesize == 1); ubi->nor_flash = 1; } ubi->min_io_size = ubi->mtd->writesize; ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft; /* * Make sure minimal I/O unit is power of 2. Note, there is no * fundamental reason for this assumption. It is just an optimization * which allows us to avoid costly division operations. */ if (!is_power_of_2(ubi->min_io_size)) { ubi_err(ubi, "min. I/O unit (%d) is not power of 2", ubi->min_io_size); return -EINVAL; } ubi_assert(ubi->hdrs_min_io_size > 0); ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size); ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0); ubi->max_write_size = ubi->mtd->writebufsize; /* * Maximum write size has to be greater or equivalent to min. I/O * size, and be multiple of min. I/O size. */ if (ubi->max_write_size < ubi->min_io_size || ubi->max_write_size % ubi->min_io_size || !is_power_of_2(ubi->max_write_size)) { ubi_err(ubi, "bad write buffer size %d for %d min. I/O unit", ubi->max_write_size, ubi->min_io_size); return -EINVAL; } /* Calculate default aligned sizes of EC and VID headers */ ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size); ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size); dbg_gen("min_io_size %d", ubi->min_io_size); dbg_gen("max_write_size %d", ubi->max_write_size); dbg_gen("hdrs_min_io_size %d", ubi->hdrs_min_io_size); dbg_gen("ec_hdr_alsize %d", ubi->ec_hdr_alsize); dbg_gen("vid_hdr_alsize %d", ubi->vid_hdr_alsize); if (ubi->vid_hdr_offset == 0) /* Default offset */ ubi->vid_hdr_offset = ubi->vid_hdr_aloffset = ubi->ec_hdr_alsize; else { ubi->vid_hdr_aloffset = ubi->vid_hdr_offset & ~(ubi->hdrs_min_io_size - 1); ubi->vid_hdr_shift = ubi->vid_hdr_offset - ubi->vid_hdr_aloffset; } /* Similar for the data offset */ ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE; ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size); dbg_gen("vid_hdr_offset %d", ubi->vid_hdr_offset); dbg_gen("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset); dbg_gen("vid_hdr_shift %d", ubi->vid_hdr_shift); dbg_gen("leb_start %d", ubi->leb_start); /* The shift must be aligned to 32-bit boundary */ if (ubi->vid_hdr_shift % 4) { ubi_err(ubi, "unaligned VID header shift %d", ubi->vid_hdr_shift); return -EINVAL; } /* Check sanity */ if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE || ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE || ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE || ubi->leb_start & (ubi->min_io_size - 1)) { ubi_err(ubi, "bad VID header (%d) or data offsets (%d)", ubi->vid_hdr_offset, ubi->leb_start); return -EINVAL; } /* * Set maximum amount of physical erroneous eraseblocks to be 10%. * Erroneous PEB are those which have read errors. */ ubi->max_erroneous = ubi->peb_count / 10; if (ubi->max_erroneous < 16) ubi->max_erroneous = 16; dbg_gen("max_erroneous %d", ubi->max_erroneous); /* * It may happen that EC and VID headers are situated in one minimal * I/O unit. In this case we can only accept this UBI image in * read-only mode. */ if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) { ubi_warn(ubi, "EC and VID headers are in the same minimal I/O unit, switch to read-only mode"); ubi->ro_mode = 1; } ubi->leb_size = ubi->peb_size - ubi->leb_start; if (!(ubi->mtd->flags & MTD_WRITEABLE)) { ubi_msg(ubi, "MTD device %d is write-protected, attach in read-only mode", ubi->mtd->index); ubi->ro_mode = 1; } /* * Note, ideally, we have to initialize @ubi->bad_peb_count here. But * unfortunately, MTD does not provide this information. We should loop * over all physical eraseblocks and invoke mtd->block_is_bad() for * each physical eraseblock. So, we leave @ubi->bad_peb_count * uninitialized so far. */ return 0; } /** * autoresize - re-size the volume which has the "auto-resize" flag set. * @ubi: UBI device description object * @vol_id: ID of the volume to re-size * * This function re-sizes the volume marked by the %UBI_VTBL_AUTORESIZE_FLG in * the volume table to the largest possible size. See comments in ubi-header.h * for more description of the flag. Returns zero in case of success and a * negative error code in case of failure. */ static int autoresize(struct ubi_device *ubi, int vol_id) { struct ubi_volume_desc desc; struct ubi_volume *vol = ubi->volumes[vol_id]; int err, old_reserved_pebs = vol->reserved_pebs; if (ubi->ro_mode) { ubi_warn(ubi, "skip auto-resize because of R/O mode"); return 0; } /* * Clear the auto-resize flag in the volume in-memory copy of the * volume table, and 'ubi_resize_volume()' will propagate this change * to the flash. */ ubi->vtbl[vol_id].flags &= ~UBI_VTBL_AUTORESIZE_FLG; if (ubi->avail_pebs == 0) { struct ubi_vtbl_record vtbl_rec; /* * No available PEBs to re-size the volume, clear the flag on * flash and exit. */ vtbl_rec = ubi->vtbl[vol_id]; err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); if (err) ubi_err(ubi, "cannot clean auto-resize flag for volume %d", vol_id); } else { desc.vol = vol; err = ubi_resize_volume(&desc, old_reserved_pebs + ubi->avail_pebs); if (err) ubi_err(ubi, "cannot auto-resize volume %d", vol_id); } if (err) return err; ubi_msg(ubi, "volume %d (\"%s\") re-sized from %d to %d LEBs", vol_id, vol->name, old_reserved_pebs, vol->reserved_pebs); return 0; } /** * ubi_attach_mtd_dev - attach an MTD device. * @mtd: MTD device description object * @ubi_num: number to assign to the new UBI device * @vid_hdr_offset: VID header offset * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs * * This function attaches MTD device @mtd_dev to UBI and assigns @ubi_num number * to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in * which case this function finds a vacant device number and assigns it * automatically. Returns the new UBI device number in case of success and a * negative error code in case of failure. * * Note, the invocation of this function has to be serialized by the * @ubi_devices_mutex. */ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset, int max_beb_per1024) { struct ubi_device *ubi; int i, err, ref = 0; /* * Do not try to attach an UBI device if this device has partitions * as it's not a good idea to attach UBI on a raw device when the * real UBI only spans the first partition. */ if (!list_empty(&mtd->partitions)) return -EBUSY; if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT) return -EINVAL; if (!max_beb_per1024) max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT; /* * Check if we already have the same MTD device attached. * * Note, this function assumes that UBI devices creations and deletions * are serialized, so it does not take the &ubi_devices_lock. */ for (i = 0; i < UBI_MAX_DEVICES; i++) { ubi = ubi_devices[i]; if (ubi && mtd == ubi->mtd) { pr_err("ubi: mtd%d is already attached to ubi%d\n", mtd->index, i); return -EEXIST; } } /* * Make sure this MTD device is not emulated on top of an UBI volume * already. Well, generally this recursion works fine, but there are * different problems like the UBI module takes a reference to itself * by attaching (and thus, opening) the emulated MTD device. This * results in inability to unload the module. And in general it makes * no sense to attach emulated MTD devices, so we prohibit this. */ if (mtd->type == MTD_UBIVOLUME) { pr_err("ubi: refuse attaching mtd%d - it is already emulated on top of UBI\n", mtd->index); return -EINVAL; } if (ubi_num == UBI_DEV_NUM_AUTO) { /* Search for an empty slot in the @ubi_devices array */ for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) if (!ubi_devices[ubi_num]) break; if (ubi_num == UBI_MAX_DEVICES) { pr_err("ubi: only %d UBI devices may be created\n", UBI_MAX_DEVICES); return -ENFILE; } } else { if (ubi_num >= UBI_MAX_DEVICES) return -EINVAL; /* Make sure ubi_num is not busy */ if (ubi_devices[ubi_num]) { pr_err("ubi: ubi%i already exists\n", ubi_num); return -EEXIST; } } ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL); if (!ubi) return -ENOMEM; ubi->mtd = mtd; ubi->ubi_num = ubi_num; ubi->vid_hdr_offset = vid_hdr_offset; ubi->autoresize_vol_id = -1; #ifdef CONFIG_MTD_UBI_FASTMAP ubi->fm_pool.used = ubi->fm_pool.size = 0; ubi->fm_wl_pool.used = ubi->fm_wl_pool.size = 0; /* * fm_pool.max_size is 5% of the total number of PEBs but it's also * between UBI_FM_MAX_POOL_SIZE and UBI_FM_MIN_POOL_SIZE. */ ubi->fm_pool.max_size = min(((int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) / 100) * 5, UBI_FM_MAX_POOL_SIZE); ubi->fm_pool.max_size = max(ubi->fm_pool.max_size, UBI_FM_MIN_POOL_SIZE); ubi->fm_wl_pool.max_size = ubi->fm_pool.max_size / 2; ubi->fm_disabled = !fm_autoconvert; if (!ubi->fm_disabled && (int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) <= UBI_FM_MAX_START) { ubi_err(ubi, "More than %i PEBs are needed for fastmap, sorry.", UBI_FM_MAX_START); ubi->fm_disabled = 1; } ubi_debug("default fastmap pool size: %d", ubi->fm_pool.max_size); ubi_debug("default fastmap WL pool size: %d", ubi->fm_wl_pool.max_size); #else ubi->fm_disabled = 1; #endif err = io_init(ubi, max_beb_per1024); if (err) goto out_free; err = -ENOMEM; ubi->peb_buf = vmalloc(ubi->peb_size); if (!ubi->peb_buf) goto out_free; #ifdef CONFIG_MTD_UBI_FASTMAP ubi->fm_size = ubi_calc_fm_size(ubi); ubi->fm_buf = kzalloc(ubi->fm_size, GFP_KERNEL); if (!ubi->fm_buf) goto out_free; #endif err = ubi_attach(ubi, 0); if (err) { ubi_err(ubi, "failed to attach mtd%d, error %d", mtd->index, err); goto out_free; } ubi->thread_enabled = 1; /* No threading, call ubi_thread directly */ ubi_thread(ubi); if (ubi->autoresize_vol_id != -1) { err = autoresize(ubi, ubi->autoresize_vol_id); if (err) goto out_detach; } /* Make device "available" before it becomes accessible via sysfs */ ubi_devices[ubi_num] = ubi; err = uif_init(ubi, &ref); if (err) goto out_detach; ubi_msg(ubi, "attached mtd%d (name \"%s\", size %llu MiB) to ubi%d", mtd->index, mtd->name, ubi->flash_size >> 20, ubi_num); ubi_msg(ubi, "PEB size: %d bytes (%d KiB), LEB size: %d bytes", ubi->peb_size, ubi->peb_size >> 10, ubi->leb_size); ubi_msg(ubi, "min./max. I/O unit sizes: %d/%d, sub-page size %d", ubi->min_io_size, ubi->max_write_size, ubi->hdrs_min_io_size); ubi_msg(ubi, "VID header offset: %d (aligned %d), data offset: %d", ubi->vid_hdr_offset, ubi->vid_hdr_aloffset, ubi->leb_start); ubi_msg(ubi, "good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d", ubi->good_peb_count, ubi->bad_peb_count, ubi->corr_peb_count); ubi_msg(ubi, "user volume: %d, internal volumes: %d, max. volumes count: %d", ubi->vol_count - UBI_INT_VOL_COUNT, UBI_INT_VOL_COUNT, ubi->vtbl_slots); ubi_msg(ubi, "max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u", ubi->max_ec, ubi->mean_ec, UBI_WL_THRESHOLD, ubi->image_seq); ubi_msg(ubi, "available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d", ubi->avail_pebs, ubi->rsvd_pebs, ubi->beb_rsvd_pebs); dev_add_param_uint32_ro(&ubi->dev, "peb_size", &ubi->peb_size, "%u"); dev_add_param_uint32_ro(&ubi->dev, "leb_size", &ubi->leb_size, "%u"); dev_add_param_uint32_ro(&ubi->dev, "vid_header_offset", &ubi->vid_hdr_offset, "%u"); dev_add_param_uint32_ro(&ubi->dev, "min_io_size", &ubi->min_io_size, "%u"); dev_add_param_uint32_ro(&ubi->dev, "sub_page_size", &ubi->hdrs_min_io_size, "%u"); dev_add_param_uint32_ro(&ubi->dev, "good_peb_count", &ubi->good_peb_count, "%u"); dev_add_param_uint32_ro(&ubi->dev, "bad_peb_count", &ubi->bad_peb_count, "%u"); dev_add_param_uint32_ro(&ubi->dev, "max_erase_counter", &ubi->max_ec, "%u"); dev_add_param_uint32_ro(&ubi->dev, "mean_erase_counter", &ubi->mean_ec, "%u"); dev_add_param_uint32_ro(&ubi->dev, "available_pebs", &ubi->avail_pebs, "%u"); dev_add_param_uint32_ro(&ubi->dev, "reserved_pebs", &ubi->rsvd_pebs, "%u"); return ubi_num; out_detach: ubi_devices[ubi_num] = NULL; ubi_wl_close(ubi); ubi_free_internal_volumes(ubi); vfree(ubi->vtbl); out_free: vfree(ubi->peb_buf); vfree(ubi->fm_buf); kfree(ubi); return err; } /** * ubi_detach_mtd_dev - detach an MTD device. * @ubi_num: UBI device number to detach from * @anyway: detach MTD even if device reference count is not zero * * This function destroys an UBI device number @ubi_num and detaches the * underlying MTD device. Returns zero in case of success and %-EBUSY if the * UBI device is busy and cannot be destroyed, and %-EINVAL if it does not * exist. * * Note, the invocation of this function has to be serialized by the * @ubi_devices_mutex. */ int ubi_detach_mtd_dev(int ubi_num, int anyway) { struct ubi_device *ubi; if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) return -EINVAL; ubi = ubi_get_device(ubi_num); if (!ubi) return -EINVAL; ubi->ref_count--; if (ubi->ref_count) return -EBUSY; ubi_devices[ubi_num] = NULL; ubi_assert(ubi_num == ubi->ubi_num); ubi_msg(ubi, "detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num); #ifdef CONFIG_MTD_UBI_FASTMAP /* If we don't write a new fastmap at detach time we lose all * EC updates that have been made since the last written fastmap. */ ubi_update_fastmap(ubi); #endif uif_close(ubi); ubi_wl_close(ubi); ubi_free_internal_volumes(ubi); vfree(ubi->vtbl); vfree(ubi->peb_buf); vfree(ubi->fm_buf); ubi_msg(ubi, "mtd%d is detached", ubi->mtd->index); kfree(ubi); return 0; }