| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (c) International Business Machines Corp., 2006 |
| * |
| * Author: Artem Bityutskiy (Битюцкий Артём) |
| */ |
| |
| #include "ubi.h" |
| #include <linux/debugfs.h> |
| #include <linux/uaccess.h> |
| #include <linux/module.h> |
| #include <linux/seq_file.h> |
| |
| |
| /** |
| * ubi_dump_flash - dump a region of flash. |
| * @ubi: UBI device description object |
| * @pnum: the physical eraseblock number to dump |
| * @offset: the starting offset within the physical eraseblock to dump |
| * @len: the length of the region to dump |
| */ |
| void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len) |
| { |
| int err; |
| size_t read; |
| void *buf; |
| loff_t addr = (loff_t)pnum * ubi->peb_size + offset; |
| |
| buf = vmalloc(len); |
| if (!buf) |
| return; |
| err = mtd_read(ubi->mtd, addr, len, &read, buf); |
| if (err && err != -EUCLEAN) { |
| ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes", |
| err, len, pnum, offset, read); |
| goto out; |
| } |
| |
| ubi_msg(ubi, "dumping %d bytes of data from PEB %d, offset %d", |
| len, pnum, offset); |
| print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1); |
| out: |
| vfree(buf); |
| return; |
| } |
| |
| /** |
| * ubi_dump_ec_hdr - dump an erase counter header. |
| * @ec_hdr: the erase counter header to dump |
| */ |
| void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr) |
| { |
| pr_err("Erase counter header dump:\n"); |
| pr_err("\tmagic %#08x\n", be32_to_cpu(ec_hdr->magic)); |
| pr_err("\tversion %d\n", (int)ec_hdr->version); |
| pr_err("\tec %llu\n", (long long)be64_to_cpu(ec_hdr->ec)); |
| pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset)); |
| pr_err("\tdata_offset %d\n", be32_to_cpu(ec_hdr->data_offset)); |
| pr_err("\timage_seq %d\n", be32_to_cpu(ec_hdr->image_seq)); |
| pr_err("\thdr_crc %#08x\n", be32_to_cpu(ec_hdr->hdr_crc)); |
| pr_err("erase counter header hexdump:\n"); |
| print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, |
| ec_hdr, UBI_EC_HDR_SIZE, 1); |
| } |
| |
| /** |
| * ubi_dump_vid_hdr - dump a volume identifier header. |
| * @vid_hdr: the volume identifier header to dump |
| */ |
| void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr) |
| { |
| pr_err("Volume identifier header dump:\n"); |
| pr_err("\tmagic %08x\n", be32_to_cpu(vid_hdr->magic)); |
| pr_err("\tversion %d\n", (int)vid_hdr->version); |
| pr_err("\tvol_type %d\n", (int)vid_hdr->vol_type); |
| pr_err("\tcopy_flag %d\n", (int)vid_hdr->copy_flag); |
| pr_err("\tcompat %d\n", (int)vid_hdr->compat); |
| pr_err("\tvol_id %d\n", be32_to_cpu(vid_hdr->vol_id)); |
| pr_err("\tlnum %d\n", be32_to_cpu(vid_hdr->lnum)); |
| pr_err("\tdata_size %d\n", be32_to_cpu(vid_hdr->data_size)); |
| pr_err("\tused_ebs %d\n", be32_to_cpu(vid_hdr->used_ebs)); |
| pr_err("\tdata_pad %d\n", be32_to_cpu(vid_hdr->data_pad)); |
| pr_err("\tsqnum %llu\n", |
| (unsigned long long)be64_to_cpu(vid_hdr->sqnum)); |
| pr_err("\thdr_crc %08x\n", be32_to_cpu(vid_hdr->hdr_crc)); |
| pr_err("Volume identifier header hexdump:\n"); |
| print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, |
| vid_hdr, UBI_VID_HDR_SIZE, 1); |
| } |
| |
| /** |
| * ubi_dump_vol_info - dump volume information. |
| * @vol: UBI volume description object |
| */ |
| void ubi_dump_vol_info(const struct ubi_volume *vol) |
| { |
| pr_err("Volume information dump:\n"); |
| pr_err("\tvol_id %d\n", vol->vol_id); |
| pr_err("\treserved_pebs %d\n", vol->reserved_pebs); |
| pr_err("\talignment %d\n", vol->alignment); |
| pr_err("\tdata_pad %d\n", vol->data_pad); |
| pr_err("\tvol_type %d\n", vol->vol_type); |
| pr_err("\tname_len %d\n", vol->name_len); |
| pr_err("\tusable_leb_size %d\n", vol->usable_leb_size); |
| pr_err("\tused_ebs %d\n", vol->used_ebs); |
| pr_err("\tused_bytes %lld\n", vol->used_bytes); |
| pr_err("\tlast_eb_bytes %d\n", vol->last_eb_bytes); |
| pr_err("\tcorrupted %d\n", vol->corrupted); |
| pr_err("\tupd_marker %d\n", vol->upd_marker); |
| |
| if (vol->name_len <= UBI_VOL_NAME_MAX && |
| strnlen(vol->name, vol->name_len + 1) == vol->name_len) { |
| pr_err("\tname %s\n", vol->name); |
| } else { |
| pr_err("\t1st 5 characters of name: %c%c%c%c%c\n", |
| vol->name[0], vol->name[1], vol->name[2], |
| vol->name[3], vol->name[4]); |
| } |
| } |
| |
| /** |
| * ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object. |
| * @r: the object to dump |
| * @idx: volume table index |
| */ |
| void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx) |
| { |
| int name_len = be16_to_cpu(r->name_len); |
| |
| pr_err("Volume table record %d dump:\n", idx); |
| pr_err("\treserved_pebs %d\n", be32_to_cpu(r->reserved_pebs)); |
| pr_err("\talignment %d\n", be32_to_cpu(r->alignment)); |
| pr_err("\tdata_pad %d\n", be32_to_cpu(r->data_pad)); |
| pr_err("\tvol_type %d\n", (int)r->vol_type); |
| pr_err("\tupd_marker %d\n", (int)r->upd_marker); |
| pr_err("\tname_len %d\n", name_len); |
| |
| if (r->name[0] == '\0') { |
| pr_err("\tname NULL\n"); |
| return; |
| } |
| |
| if (name_len <= UBI_VOL_NAME_MAX && |
| strnlen(&r->name[0], name_len + 1) == name_len) { |
| pr_err("\tname %s\n", &r->name[0]); |
| } else { |
| pr_err("\t1st 5 characters of name: %c%c%c%c%c\n", |
| r->name[0], r->name[1], r->name[2], r->name[3], |
| r->name[4]); |
| } |
| pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc)); |
| } |
| |
| /** |
| * ubi_dump_av - dump a &struct ubi_ainf_volume object. |
| * @av: the object to dump |
| */ |
| void ubi_dump_av(const struct ubi_ainf_volume *av) |
| { |
| pr_err("Volume attaching information dump:\n"); |
| pr_err("\tvol_id %d\n", av->vol_id); |
| pr_err("\thighest_lnum %d\n", av->highest_lnum); |
| pr_err("\tleb_count %d\n", av->leb_count); |
| pr_err("\tcompat %d\n", av->compat); |
| pr_err("\tvol_type %d\n", av->vol_type); |
| pr_err("\tused_ebs %d\n", av->used_ebs); |
| pr_err("\tlast_data_size %d\n", av->last_data_size); |
| pr_err("\tdata_pad %d\n", av->data_pad); |
| } |
| |
| /** |
| * ubi_dump_aeb - dump a &struct ubi_ainf_peb object. |
| * @aeb: the object to dump |
| * @type: object type: 0 - not corrupted, 1 - corrupted |
| */ |
| void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type) |
| { |
| pr_err("eraseblock attaching information dump:\n"); |
| pr_err("\tec %d\n", aeb->ec); |
| pr_err("\tpnum %d\n", aeb->pnum); |
| if (type == 0) { |
| pr_err("\tlnum %d\n", aeb->lnum); |
| pr_err("\tscrub %d\n", aeb->scrub); |
| pr_err("\tsqnum %llu\n", aeb->sqnum); |
| } |
| } |
| |
| /** |
| * ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object. |
| * @req: the object to dump |
| */ |
| void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req) |
| { |
| char nm[17]; |
| |
| pr_err("Volume creation request dump:\n"); |
| pr_err("\tvol_id %d\n", req->vol_id); |
| pr_err("\talignment %d\n", req->alignment); |
| pr_err("\tbytes %lld\n", (long long)req->bytes); |
| pr_err("\tvol_type %d\n", req->vol_type); |
| pr_err("\tname_len %d\n", req->name_len); |
| |
| memcpy(nm, req->name, 16); |
| nm[16] = 0; |
| pr_err("\t1st 16 characters of name: %s\n", nm); |
| } |
| |
| /* |
| * Root directory for UBI stuff in debugfs. Contains sub-directories which |
| * contain the stuff specific to particular UBI devices. |
| */ |
| static struct dentry *dfs_rootdir; |
| |
| /** |
| * ubi_debugfs_init - create UBI debugfs directory. |
| * |
| * Create UBI debugfs directory. Returns zero in case of success and a negative |
| * error code in case of failure. |
| */ |
| int ubi_debugfs_init(void) |
| { |
| if (!IS_ENABLED(CONFIG_DEBUG_FS)) |
| return 0; |
| |
| dfs_rootdir = debugfs_create_dir("ubi", NULL); |
| if (IS_ERR_OR_NULL(dfs_rootdir)) { |
| int err = dfs_rootdir ? PTR_ERR(dfs_rootdir) : -ENODEV; |
| |
| pr_err("UBI error: cannot create \"ubi\" debugfs directory, error %d\n", |
| err); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * ubi_debugfs_exit - remove UBI debugfs directory. |
| */ |
| void ubi_debugfs_exit(void) |
| { |
| if (IS_ENABLED(CONFIG_DEBUG_FS)) |
| debugfs_remove(dfs_rootdir); |
| } |
| |
| /* Read an UBI debugfs file */ |
| static ssize_t dfs_file_read(struct file *file, char __user *user_buf, |
| size_t count, loff_t *ppos) |
| { |
| unsigned long ubi_num = (unsigned long)file->private_data; |
| struct dentry *dent = file->f_path.dentry; |
| struct ubi_device *ubi; |
| struct ubi_debug_info *d; |
| char buf[8]; |
| int val; |
| |
| ubi = ubi_get_device(ubi_num); |
| if (!ubi) |
| return -ENODEV; |
| d = &ubi->dbg; |
| |
| if (dent == d->dfs_chk_gen) |
| val = d->chk_gen; |
| else if (dent == d->dfs_chk_io) |
| val = d->chk_io; |
| else if (dent == d->dfs_chk_fastmap) |
| val = d->chk_fastmap; |
| else if (dent == d->dfs_disable_bgt) |
| val = d->disable_bgt; |
| else if (dent == d->dfs_emulate_bitflips) |
| val = d->emulate_bitflips; |
| else if (dent == d->dfs_emulate_io_failures) |
| val = d->emulate_io_failures; |
| else if (dent == d->dfs_emulate_power_cut) { |
| snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut); |
| count = simple_read_from_buffer(user_buf, count, ppos, |
| buf, strlen(buf)); |
| goto out; |
| } else if (dent == d->dfs_power_cut_min) { |
| snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min); |
| count = simple_read_from_buffer(user_buf, count, ppos, |
| buf, strlen(buf)); |
| goto out; |
| } else if (dent == d->dfs_power_cut_max) { |
| snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max); |
| count = simple_read_from_buffer(user_buf, count, ppos, |
| buf, strlen(buf)); |
| goto out; |
| } |
| else { |
| count = -EINVAL; |
| goto out; |
| } |
| |
| if (val) |
| buf[0] = '1'; |
| else |
| buf[0] = '0'; |
| buf[1] = '\n'; |
| buf[2] = 0x00; |
| |
| count = simple_read_from_buffer(user_buf, count, ppos, buf, 2); |
| |
| out: |
| ubi_put_device(ubi); |
| return count; |
| } |
| |
| /* Write an UBI debugfs file */ |
| static ssize_t dfs_file_write(struct file *file, const char __user *user_buf, |
| size_t count, loff_t *ppos) |
| { |
| unsigned long ubi_num = (unsigned long)file->private_data; |
| struct dentry *dent = file->f_path.dentry; |
| struct ubi_device *ubi; |
| struct ubi_debug_info *d; |
| size_t buf_size; |
| char buf[8] = {0}; |
| int val; |
| |
| ubi = ubi_get_device(ubi_num); |
| if (!ubi) |
| return -ENODEV; |
| d = &ubi->dbg; |
| |
| buf_size = min_t(size_t, count, (sizeof(buf) - 1)); |
| if (copy_from_user(buf, user_buf, buf_size)) { |
| count = -EFAULT; |
| goto out; |
| } |
| |
| if (dent == d->dfs_power_cut_min) { |
| if (kstrtouint(buf, 0, &d->power_cut_min) != 0) |
| count = -EINVAL; |
| goto out; |
| } else if (dent == d->dfs_power_cut_max) { |
| if (kstrtouint(buf, 0, &d->power_cut_max) != 0) |
| count = -EINVAL; |
| goto out; |
| } else if (dent == d->dfs_emulate_power_cut) { |
| if (kstrtoint(buf, 0, &val) != 0) |
| count = -EINVAL; |
| else |
| d->emulate_power_cut = val; |
| goto out; |
| } |
| |
| if (buf[0] == '1') |
| val = 1; |
| else if (buf[0] == '0') |
| val = 0; |
| else { |
| count = -EINVAL; |
| goto out; |
| } |
| |
| if (dent == d->dfs_chk_gen) |
| d->chk_gen = val; |
| else if (dent == d->dfs_chk_io) |
| d->chk_io = val; |
| else if (dent == d->dfs_chk_fastmap) |
| d->chk_fastmap = val; |
| else if (dent == d->dfs_disable_bgt) |
| d->disable_bgt = val; |
| else if (dent == d->dfs_emulate_bitflips) |
| d->emulate_bitflips = val; |
| else if (dent == d->dfs_emulate_io_failures) |
| d->emulate_io_failures = val; |
| else |
| count = -EINVAL; |
| |
| out: |
| ubi_put_device(ubi); |
| return count; |
| } |
| |
| /* File operations for all UBI debugfs files except |
| * detailed_erase_block_info |
| */ |
| static const struct file_operations dfs_fops = { |
| .read = dfs_file_read, |
| .write = dfs_file_write, |
| .open = simple_open, |
| .llseek = no_llseek, |
| .owner = THIS_MODULE, |
| }; |
| |
| /* As long as the position is less then that total number of erase blocks, |
| * we still have more to print. |
| */ |
| static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos) |
| { |
| struct ubi_device *ubi = s->private; |
| |
| if (*pos == 0) |
| return SEQ_START_TOKEN; |
| |
| if (*pos < ubi->peb_count) |
| return pos; |
| |
| return NULL; |
| } |
| |
| /* Since we are using the position as the iterator, we just need to check if we |
| * are done and increment the position. |
| */ |
| static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| { |
| struct ubi_device *ubi = s->private; |
| |
| if (v == SEQ_START_TOKEN) |
| return pos; |
| (*pos)++; |
| |
| if (*pos < ubi->peb_count) |
| return pos; |
| |
| return NULL; |
| } |
| |
| static void eraseblk_count_seq_stop(struct seq_file *s, void *v) |
| { |
| } |
| |
| static int eraseblk_count_seq_show(struct seq_file *s, void *iter) |
| { |
| struct ubi_device *ubi = s->private; |
| struct ubi_wl_entry *wl; |
| int *block_number = iter; |
| int erase_count = -1; |
| int err; |
| |
| /* If this is the start, print a header */ |
| if (iter == SEQ_START_TOKEN) { |
| seq_puts(s, |
| "physical_block_number\terase_count\tblock_status\tread_status\n"); |
| return 0; |
| } |
| |
| err = ubi_io_is_bad(ubi, *block_number); |
| if (err) |
| return err; |
| |
| spin_lock(&ubi->wl_lock); |
| |
| wl = ubi->lookuptbl[*block_number]; |
| if (wl) |
| erase_count = wl->ec; |
| |
| spin_unlock(&ubi->wl_lock); |
| |
| if (erase_count < 0) |
| return 0; |
| |
| seq_printf(s, "%-22d\t%-11d\n", *block_number, erase_count); |
| |
| return 0; |
| } |
| |
| static const struct seq_operations eraseblk_count_seq_ops = { |
| .start = eraseblk_count_seq_start, |
| .next = eraseblk_count_seq_next, |
| .stop = eraseblk_count_seq_stop, |
| .show = eraseblk_count_seq_show |
| }; |
| |
| static int eraseblk_count_open(struct inode *inode, struct file *f) |
| { |
| struct seq_file *s; |
| int err; |
| |
| err = seq_open(f, &eraseblk_count_seq_ops); |
| if (err) |
| return err; |
| |
| s = f->private_data; |
| s->private = ubi_get_device((unsigned long)inode->i_private); |
| |
| if (!s->private) |
| return -ENODEV; |
| else |
| return 0; |
| } |
| |
| static int eraseblk_count_release(struct inode *inode, struct file *f) |
| { |
| struct seq_file *s = f->private_data; |
| struct ubi_device *ubi = s->private; |
| |
| ubi_put_device(ubi); |
| |
| return seq_release(inode, f); |
| } |
| |
| static const struct file_operations eraseblk_count_fops = { |
| .owner = THIS_MODULE, |
| .open = eraseblk_count_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = eraseblk_count_release, |
| }; |
| |
| /** |
| * ubi_debugfs_init_dev - initialize debugfs for an UBI device. |
| * @ubi: UBI device description object |
| * |
| * This function creates all debugfs files for UBI device @ubi. Returns zero in |
| * case of success and a negative error code in case of failure. |
| */ |
| int ubi_debugfs_init_dev(struct ubi_device *ubi) |
| { |
| int err, n; |
| unsigned long ubi_num = ubi->ubi_num; |
| const char *fname; |
| struct dentry *dent; |
| struct ubi_debug_info *d = &ubi->dbg; |
| |
| if (!IS_ENABLED(CONFIG_DEBUG_FS)) |
| return 0; |
| |
| n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME, |
| ubi->ubi_num); |
| if (n == UBI_DFS_DIR_LEN) { |
| /* The array size is too small */ |
| fname = UBI_DFS_DIR_NAME; |
| dent = ERR_PTR(-EINVAL); |
| goto out; |
| } |
| |
| fname = d->dfs_dir_name; |
| dent = debugfs_create_dir(fname, dfs_rootdir); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out; |
| d->dfs_dir = dent; |
| |
| fname = "chk_gen"; |
| dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, |
| &dfs_fops); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out_remove; |
| d->dfs_chk_gen = dent; |
| |
| fname = "chk_io"; |
| dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, |
| &dfs_fops); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out_remove; |
| d->dfs_chk_io = dent; |
| |
| fname = "chk_fastmap"; |
| dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, |
| &dfs_fops); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out_remove; |
| d->dfs_chk_fastmap = dent; |
| |
| fname = "tst_disable_bgt"; |
| dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, |
| &dfs_fops); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out_remove; |
| d->dfs_disable_bgt = dent; |
| |
| fname = "tst_emulate_bitflips"; |
| dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, |
| &dfs_fops); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out_remove; |
| d->dfs_emulate_bitflips = dent; |
| |
| fname = "tst_emulate_io_failures"; |
| dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, |
| &dfs_fops); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out_remove; |
| d->dfs_emulate_io_failures = dent; |
| |
| fname = "tst_emulate_power_cut"; |
| dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, |
| &dfs_fops); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out_remove; |
| d->dfs_emulate_power_cut = dent; |
| |
| fname = "tst_emulate_power_cut_min"; |
| dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, |
| &dfs_fops); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out_remove; |
| d->dfs_power_cut_min = dent; |
| |
| fname = "tst_emulate_power_cut_max"; |
| dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, |
| &dfs_fops); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out_remove; |
| d->dfs_power_cut_max = dent; |
| |
| fname = "detailed_erase_block_info"; |
| dent = debugfs_create_file(fname, S_IRUSR, d->dfs_dir, (void *)ubi_num, |
| &eraseblk_count_fops); |
| if (IS_ERR_OR_NULL(dent)) |
| goto out_remove; |
| |
| return 0; |
| |
| out_remove: |
| debugfs_remove_recursive(d->dfs_dir); |
| out: |
| err = dent ? PTR_ERR(dent) : -ENODEV; |
| ubi_err(ubi, "cannot create \"%s\" debugfs file or directory, error %d\n", |
| fname, err); |
| return err; |
| } |
| |
| /** |
| * dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi |
| * @ubi: UBI device description object |
| */ |
| void ubi_debugfs_exit_dev(struct ubi_device *ubi) |
| { |
| if (IS_ENABLED(CONFIG_DEBUG_FS)) |
| debugfs_remove_recursive(ubi->dbg.dfs_dir); |
| } |
| |
| /** |
| * ubi_dbg_power_cut - emulate a power cut if it is time to do so |
| * @ubi: UBI device description object |
| * @caller: Flags set to indicate from where the function is being called |
| * |
| * Returns non-zero if a power cut was emulated, zero if not. |
| */ |
| int ubi_dbg_power_cut(struct ubi_device *ubi, int caller) |
| { |
| unsigned int range; |
| |
| if ((ubi->dbg.emulate_power_cut & caller) == 0) |
| return 0; |
| |
| if (ubi->dbg.power_cut_counter == 0) { |
| ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min; |
| |
| if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) { |
| range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min; |
| ubi->dbg.power_cut_counter += prandom_u32() % range; |
| } |
| return 0; |
| } |
| |
| ubi->dbg.power_cut_counter--; |
| if (ubi->dbg.power_cut_counter) |
| return 0; |
| |
| ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX"); |
| ubi_ro_mode(ubi); |
| return 1; |
| } |