| 1 | |
| 2 | |
| 3 | * Copyright (C) 2006-2008 Nokia Corporation
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| 4 | *
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| 5 | * Check MTD device read.
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| 6 | *
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| 7 | * Author: Adrian Hunter <[email protected]>
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| 8 |
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| 9 |
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| 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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| 11 |
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| 12 | #include <linux/init.h>
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| 13 | #include <linux/module.h>
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| 14 | #include <linux/moduleparam.h>
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| 15 | #include <linux/err.h>
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| 16 | #include <linux/mtd/mtd.h>
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| 17 | #include <linux/slab.h>
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| 18 | #include <linux/sched.h>
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| 19 |
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| 20 | #include "mtd_test.h"
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| 21 |
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| 22 | static int dev = -EINVAL;
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| 23 | module_param(dev, int, S_IRUGO);
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| 24 | MODULE_PARM_DESC(dev, "MTD device number to use");
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| 25 |
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| 26 | static struct mtd_info *mtd;
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| 27 | static unsigned char *iobuf;
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| 28 | static unsigned char *iobuf1;
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| 29 | static unsigned char *bbt;
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| 30 |
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| 31 | static int pgsize;
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| 32 | static int ebcnt;
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| 33 | static int pgcnt;
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| 34 |
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| 35 | static int read_eraseblock_by_page(int ebnum)
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| 36 | {
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| 37 | int i, ret, err = 0;
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| 38 | loff_t addr = (loff_t)ebnum * mtd->erasesize;
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| 39 | void *buf = iobuf;
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| 40 | void *oobbuf = iobuf1;
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| 41 |
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| 42 | for (i = 0; i < pgcnt; i++) {
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| 43 | memset(buf, 0 , pgsize);
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| 44 | ret = mtdtest_read(mtd, addr, pgsize, buf);
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| 45 | if (ret) {
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| 46 | if (!err)
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| 47 | err = ret;
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| 48 | }
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| 49 | if (mtd->oobsize) {
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| 50 | struct mtd_oob_ops ops = { };
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| 51 |
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| 52 | ops.mode = MTD_OPS_PLACE_OOB;
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| 53 | ops.len = 0;
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| 54 | ops.retlen = 0;
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| 55 | ops.ooblen = mtd->oobsize;
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| 56 | ops.oobretlen = 0;
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| 57 | ops.ooboffs = 0;
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| 58 | ops.datbuf = NULL;
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| 59 | ops.oobbuf = oobbuf;
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| 60 | ret = mtd_read_oob(mtd, addr, &ops);
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| 61 | if ((ret && !mtd_is_bitflip(ret)) ||
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| 62 | ops.oobretlen != mtd->oobsize) {
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| 63 | pr_err("error: read oob failed at "
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| 64 | "%#llx\n", (long long)addr);
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| 65 | if (!err)
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| 66 | err = ret;
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| 67 | if (!err)
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| 68 | err = -EINVAL;
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| 69 | }
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| 70 | oobbuf += mtd->oobsize;
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| 71 | }
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| 72 | addr += pgsize;
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| 73 | buf += pgsize;
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| 74 | }
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| 75 |
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| 76 | return err;
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| 77 | }
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| 78 |
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| 79 | static void dump_eraseblock(int ebnum)
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| 80 | {
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| 81 | int i, j, n;
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| 82 | char line[128];
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| 83 | int pg, oob;
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| 84 |
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| 85 | pr_info("dumping eraseblock %d\n", ebnum);
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| 86 | n = mtd->erasesize;
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| 87 | for (i = 0; i < n;) {
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| 88 | char *p = line;
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| 89 |
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| 90 | p += sprintf(p, "%05x: ", i);
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| 91 | for (j = 0; j < 32 && i < n; j++, i++)
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| 92 | p += sprintf(p, "%02x", (unsigned int)iobuf[i]);
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| 93 | printk(KERN_CRIT "%s\n", line);
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| 94 | cond_resched();
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| 95 | }
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| 96 | if (!mtd->oobsize)
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| 97 | return;
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| 98 | pr_info("dumping oob from eraseblock %d\n", ebnum);
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| 99 | n = mtd->oobsize;
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| 100 | for (pg = 0, i = 0; pg < pgcnt; pg++)
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| 101 | for (oob = 0; oob < n;) {
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| 102 | char *p = line;
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| 103 |
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| 104 | p += sprintf(p, "%05x: ", i);
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| 105 | for (j = 0; j < 32 && oob < n; j++, oob++, i++)
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| 106 | p += sprintf(p, "%02x",
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| 107 | (unsigned int)iobuf1[i]);
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| 108 | printk(KERN_CRIT "%s\n", line);
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| 109 | cond_resched();
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| 110 | }
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| 111 | }
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| 112 |
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| 113 | static int __init mtd_readtest_init(void)
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| 114 | {
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| 115 | uint64_t tmp;
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| 116 | int err, i;
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| 117 |
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| 118 | printk(KERN_INFO "\n");
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| 119 | printk(KERN_INFO "=================================================\n");
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| 120 |
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| 121 | if (dev < 0) {
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| 122 | pr_info("Please specify a valid mtd-device via module parameter\n");
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| 123 | return -EINVAL;
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| 124 | }
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| 125 |
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| 126 | pr_info("MTD device: %d\n", dev);
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| 127 |
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| 128 | mtd = get_mtd_device(NULL, dev);
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| 129 | if (IS_ERR(mtd)) {
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| 130 | err = PTR_ERR(mtd);
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| 131 | pr_err("error: Cannot get MTD device\n");
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| 132 | return err;
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| 133 | }
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| 134 |
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| 135 | if (mtd->writesize == 1) {
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| 136 | pr_info("not NAND flash, assume page size is 512 "
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| 137 | "bytes.\n");
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| 138 | pgsize = 512;
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| 139 | } else
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| 140 | pgsize = mtd->writesize;
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| 141 |
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| 142 | tmp = mtd->size;
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| 143 | do_div(tmp, mtd->erasesize);
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| 144 | ebcnt = tmp;
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| 145 | pgcnt = mtd->erasesize / pgsize;
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| 146 |
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| 147 | pr_info("MTD device size %llu, eraseblock size %u, "
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| 148 | "page size %u, count of eraseblocks %u, pages per "
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| 149 | "eraseblock %u, OOB size %u\n",
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| 150 | (unsigned long long)mtd->size, mtd->erasesize,
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| 151 | pgsize, ebcnt, pgcnt, mtd->oobsize);
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| 152 |
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| 153 | err = -ENOMEM;
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| 154 | iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
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| 155 | if (!iobuf)
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| 156 | goto out;
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| 157 | iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL);
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| 158 | if (!iobuf1)
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| 159 | goto out;
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| 160 |
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| 161 | bbt = kzalloc(ebcnt, GFP_KERNEL);
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| 162 | if (!bbt)
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| 163 | goto out;
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| 164 | err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
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| 165 | if (err)
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| 166 | goto out;
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| 167 |
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| 168 |
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| 169 | pr_info("testing page read\n");
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| 170 | for (i = 0; i < ebcnt; ++i) {
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| 171 | int ret;
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| 172 |
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| 173 | if (bbt[i])
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| 174 | continue;
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| 175 | ret = read_eraseblock_by_page(i);
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| 176 | if (ret) {
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| 177 | dump_eraseblock(i);
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| 178 | if (!err)
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| 179 | err = ret;
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| 180 | }
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| 181 |
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| 182 | ret = mtdtest_relax();
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| 183 | if (ret) {
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| 184 | err = ret;
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| 185 | goto out;
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| 186 | }
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| 187 | }
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| 188 |
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| 189 | if (err)
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| 190 | pr_info("finished with errors\n");
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| 191 | else
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| 192 | pr_info("finished\n");
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| 193 |
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| 194 | out:
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| 195 |
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| 196 | kfree(iobuf);
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| 197 | kfree(iobuf1);
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| 198 | kfree(bbt);
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| 199 | put_mtd_device(mtd);
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| 200 | if (err)
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| 201 | pr_info("error %d occurred\n", err);
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| 202 | printk(KERN_INFO "=================================================\n");
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| 203 | return err;
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| 204 | }
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| 205 | module_init(mtd_readtest_init);
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| 206 |
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| 207 | static void __exit mtd_readtest_exit(void)
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| 208 | {
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| 209 | return;
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| 210 | }
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| 211 | module_exit(mtd_readtest_exit);
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| 212 |
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| 213 | MODULE_DESCRIPTION("Read test module");
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| 214 | MODULE_AUTHOR("Adrian Hunter");
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| 215 | MODULE_LICENSE("GPL");
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