From patchwork Mon Dec 8 12:50:14 2008 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Artem Bityutskiy X-Patchwork-Id: 12704 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from bombadil.infradead.org (bombadil.infradead.org [18.85.46.34]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id E5E9FDDEDF for ; Mon, 8 Dec 2008 22:18:16 +1100 (EST) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.68 #1 (Red Hat Linux)) id 1L9e6c-0006ju-BN; Mon, 08 Dec 2008 11:16:50 +0000 Received: from smtp.nokia.com ([192.100.105.134] helo=mgw-mx09.nokia.com) by bombadil.infradead.org with esmtps (Exim 4.68 #1 (Red Hat Linux)) id 1L9e5C-0000J8-HM; Mon, 08 Dec 2008 11:15:23 +0000 Received: from esebh105.NOE.Nokia.com (esebh105.ntc.nokia.com [172.21.138.211]) by mgw-mx09.nokia.com (Switch-3.2.6/Switch-3.2.6) with ESMTP id mB8BF9Q8010645; Mon, 8 Dec 2008 05:15:20 -0600 Received: from vaebh104.NOE.Nokia.com ([10.160.244.30]) by esebh105.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.3959); Mon, 8 Dec 2008 13:15:07 +0200 Received: from mgw-int01.ntc.nokia.com ([172.21.143.96]) by vaebh104.NOE.Nokia.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Mon, 8 Dec 2008 13:15:06 +0200 Received: from localhost.localdomain (esdhcp041108.research.nokia.com [172.21.41.108]) by mgw-int01.ntc.nokia.com (Switch-3.2.5/Switch-3.2.5) with ESMTP id mB8BF4DZ029625; Mon, 8 Dec 2008 13:15:05 +0200 From: Artem Bityutskiy To: David Woodhouse Subject: [PATCH] MTD: tests: add mtd_oobtest Date: Mon, 8 Dec 2008 14:50:14 +0200 Message-Id: <1228740621-15197-2-git-send-email-dedekind@infradead.org> X-Mailer: git-send-email 1.5.4.1 In-Reply-To: <1228740621-15197-1-git-send-email-dedekind@infradead.org> References: <1228740621-15197-1-git-send-email-dedekind@infradead.org> X-OriginalArrivalTime: 08 Dec 2008 11:15:06.0986 (UTC) FILETIME=[39C8CCA0:01C95926] X-Nokia-AV: Clean X-Bad-Reply: References and In-Reply-To but no 'Re:' in Subject. X-Spam-Score: -4.0 (----) X-Spam-Report: SpamAssassin version 3.2.5 on bombadil.infradead.org summary: Content analysis details: (-4.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -4.0 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [192.100.105.134 listed in list.dnswl.org] X-Mailman-Approved-At: Mon, 08 Dec 2008 06:16:48 -0500 Cc: linux-mtd@lists.infradead.org X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.9 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-mtd-bounces@lists.infradead.org Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org From: Artem Bityutskiy This test checks that OOB of a NAND MTD device works fine. Signed-off-by: Artem Bityutskiy --- drivers/mtd/tests/mtd_oobtest.c | 742 +++++++++++++++++++++++++++++++++++++++ 1 files changed, 742 insertions(+), 0 deletions(-) create mode 100644 drivers/mtd/tests/mtd_oobtest.c diff --git a/drivers/mtd/tests/mtd_oobtest.c b/drivers/mtd/tests/mtd_oobtest.c new file mode 100644 index 0000000..afbc3f8 --- /dev/null +++ b/drivers/mtd/tests/mtd_oobtest.c @@ -0,0 +1,742 @@ +/* + * Copyright (C) 2006-2008 Nokia Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * 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. + * + * You should have received a copy of the GNU General Public License along with + * this program; see the file COPYING. If not, write to the Free Software + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Test OOB read and write on MTD device. + * + * Author: Adrian Hunter + */ + +#include +#include +#include +#include +#include +#include +#include + +#define PRINT_PREF KERN_INFO "mtd_oobtest: " + +static int dev; +module_param(dev, int, S_IRUGO); +MODULE_PARM_DESC(dev, "MTD device number to use"); + +static struct mtd_info *mtd; +static unsigned char *readbuf; +static unsigned char *writebuf; +static unsigned char *bbt; + +static int ebcnt; +static int pgcnt; +static int errcnt; +static int use_offset; +static int use_len; +static int use_len_max; +static int vary_offset; +static unsigned long next = 1; + +static inline unsigned int simple_rand(void) +{ + next = next * 1103515245 + 12345; + return (unsigned int)((next / 65536) % 32768); +} + +static inline void simple_srand(unsigned long seed) +{ + next = seed; +} + +static void set_random_data(unsigned char *buf, size_t len) +{ + size_t i; + + for (i = 0; i < len; ++i) + buf[i] = simple_rand(); +} + +static int erase_eraseblock(int ebnum) +{ + int err; + struct erase_info ei; + loff_t addr = ebnum * mtd->erasesize; + + memset(&ei, 0, sizeof(struct erase_info)); + ei.mtd = mtd; + ei.addr = addr; + ei.len = mtd->erasesize; + + err = mtd->erase(mtd, &ei); + if (err) { + printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum); + return err; + } + + if (ei.state == MTD_ERASE_FAILED) { + printk(PRINT_PREF "some erase error occurred at EB %d\n", + ebnum); + return -EIO; + } + + return 0; +} + +static int erase_whole_device(void) +{ + int err; + unsigned int i; + + printk(PRINT_PREF "erasing whole device\n"); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = erase_eraseblock(i); + if (err) + return err; + cond_resched(); + } + printk(PRINT_PREF "erased %u eraseblocks\n", i); + return 0; +} + +static void do_vary_offset(void) +{ + use_len -= 1; + if (use_len < 1) { + use_offset += 1; + if (use_offset >= use_len_max) + use_offset = 0; + use_len = use_len_max - use_offset; + } +} + +static int write_eraseblock(int ebnum) +{ + int i; + struct mtd_oob_ops ops; + int err = 0; + loff_t addr = ebnum * mtd->erasesize; + + for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) { + set_random_data(writebuf, use_len); + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = use_len; + ops.oobretlen = 0; + ops.ooboffs = use_offset; + ops.datbuf = 0; + ops.oobbuf = writebuf; + err = mtd->write_oob(mtd, addr, &ops); + if (err || ops.oobretlen != use_len) { + printk(PRINT_PREF "error: writeoob failed at %#llx\n", + (long long)addr); + printk(PRINT_PREF "error: use_len %d, use_offset %d\n", + use_len, use_offset); + errcnt += 1; + return err ? err : -1; + } + if (vary_offset) + do_vary_offset(); + } + + return err; +} + +static int write_whole_device(void) +{ + int err; + unsigned int i; + + printk(PRINT_PREF "writing OOBs of whole device\n"); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = write_eraseblock(i); + if (err) + return err; + if (i % 256 == 0) + printk(PRINT_PREF "written up to eraseblock %u\n", i); + cond_resched(); + } + printk(PRINT_PREF "written %u eraseblocks\n", i); + return 0; +} + +static int verify_eraseblock(int ebnum) +{ + int i; + struct mtd_oob_ops ops; + int err = 0; + loff_t addr = ebnum * mtd->erasesize; + + for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) { + set_random_data(writebuf, use_len); + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = use_len; + ops.oobretlen = 0; + ops.ooboffs = use_offset; + ops.datbuf = 0; + ops.oobbuf = readbuf; + err = mtd->read_oob(mtd, addr, &ops); + if (err || ops.oobretlen != use_len) { + printk(PRINT_PREF "error: readoob failed at %#llx\n", + (long long)addr); + errcnt += 1; + return err ? err : -1; + } + if (memcmp(readbuf, writebuf, use_len)) { + printk(PRINT_PREF "error: verify failed at %#llx\n", + (long long)addr); + errcnt += 1; + if (errcnt > 1000) { + printk(PRINT_PREF "error: too many errors\n"); + return -1; + } + } + if (use_offset != 0 || use_len < mtd->ecclayout->oobavail) { + int k; + + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->ecclayout->oobavail; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = 0; + ops.oobbuf = readbuf; + err = mtd->read_oob(mtd, addr, &ops); + if (err || ops.oobretlen != mtd->ecclayout->oobavail) { + printk(PRINT_PREF "error: readoob failed at " + "%#llx\n", (long long)addr); + errcnt += 1; + return err ? err : -1; + } + if (memcmp(readbuf + use_offset, writebuf, use_len)) { + printk(PRINT_PREF "error: verify failed at " + "%#llx\n", (long long)addr); + errcnt += 1; + if (errcnt > 1000) { + printk(PRINT_PREF "error: too many " + "errors\n"); + return -1; + } + } + for (k = 0; k < use_offset; ++k) + if (readbuf[k] != 0xff) { + printk(PRINT_PREF "error: verify 0xff " + "failed at %#llx\n", + (long long)addr); + errcnt += 1; + if (errcnt > 1000) { + printk(PRINT_PREF "error: too " + "many errors\n"); + return -1; + } + } + for (k = use_offset + use_len; + k < mtd->ecclayout->oobavail; ++k) + if (readbuf[k] != 0xff) { + printk(PRINT_PREF "error: verify 0xff " + "failed at %#llx\n", + (long long)addr); + errcnt += 1; + if (errcnt > 1000) { + printk(PRINT_PREF "error: too " + "many errors\n"); + return -1; + } + } + } + if (vary_offset) + do_vary_offset(); + } + return err; +} + +static int verify_eraseblock_in_one_go(int ebnum) +{ + struct mtd_oob_ops ops; + int err = 0; + loff_t addr = ebnum * mtd->erasesize; + size_t len = mtd->ecclayout->oobavail * pgcnt; + + set_random_data(writebuf, len); + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = len; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = 0; + ops.oobbuf = readbuf; + err = mtd->read_oob(mtd, addr, &ops); + if (err || ops.oobretlen != len) { + printk(PRINT_PREF "error: readoob failed at %#llx\n", + (long long)addr); + errcnt += 1; + return err ? err : -1; + } + if (memcmp(readbuf, writebuf, len)) { + printk(PRINT_PREF "error: verify failed at %#llx\n", + (long long)addr); + errcnt += 1; + if (errcnt > 1000) { + printk(PRINT_PREF "error: too many errors\n"); + return -1; + } + } + + return err; +} + +static int verify_all_eraseblocks(void) +{ + int err; + unsigned int i; + + printk(PRINT_PREF "verifying all eraseblocks\n"); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = verify_eraseblock(i); + if (err) + return err; + if (i % 256 == 0) + printk(PRINT_PREF "verified up to eraseblock %u\n", i); + cond_resched(); + } + printk(PRINT_PREF "verified %u eraseblocks\n", i); + return 0; +} + +static int is_block_bad(int ebnum) +{ + int ret; + loff_t addr = ebnum * mtd->erasesize; + + ret = mtd->block_isbad(mtd, addr); + if (ret) + printk(PRINT_PREF "block %d is bad\n", ebnum); + return ret; +} + +static int scan_for_bad_eraseblocks(void) +{ + int i, bad = 0; + + bbt = kmalloc(ebcnt, GFP_KERNEL); + if (!bbt) { + printk(PRINT_PREF "error: cannot allocate memory\n"); + return -ENOMEM; + } + memset(bbt, 0 , ebcnt); + + printk(PRINT_PREF "scanning for bad eraseblocks\n"); + for (i = 0; i < ebcnt; ++i) { + bbt[i] = is_block_bad(i) ? 1 : 0; + if (bbt[i]) + bad += 1; + cond_resched(); + } + printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad); + return 0; +} + +static int __init mtd_oobtest_init(void) +{ + int err = 0; + unsigned int i; + uint64_t tmp; + struct mtd_oob_ops ops; + loff_t addr = 0, addr0; + + printk(KERN_INFO "\n"); + printk(KERN_INFO "=================================================\n"); + printk(PRINT_PREF "MTD device: %d\n", dev); + + mtd = get_mtd_device(NULL, dev); + if (IS_ERR(mtd)) { + err = PTR_ERR(mtd); + printk(PRINT_PREF "error: cannot get MTD device\n"); + return err; + } + + if (mtd->type != MTD_NANDFLASH) { + printk(PRINT_PREF "this test requires NAND flash\n"); + goto out; + } + + tmp = mtd->size; + do_div(tmp, mtd->erasesize); + ebcnt = tmp; + pgcnt = mtd->erasesize / mtd->writesize; + + printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, " + "page size %u, count of eraseblocks %u, pages per " + "eraseblock %u, OOB size %u\n", + (unsigned long long)mtd->size, mtd->erasesize, + mtd->writesize, ebcnt, pgcnt, mtd->oobsize); + + err = -ENOMEM; + mtd->erasesize = mtd->erasesize; + readbuf = kmalloc(mtd->erasesize, GFP_KERNEL); + if (!readbuf) { + printk(PRINT_PREF "error: cannot allocate memory\n"); + goto out; + } + writebuf = kmalloc(mtd->erasesize, GFP_KERNEL); + if (!writebuf) { + printk(PRINT_PREF "error: cannot allocate memory\n"); + goto out; + } + + err = scan_for_bad_eraseblocks(); + if (err) + goto out; + + use_offset = 0; + use_len = mtd->ecclayout->oobavail; + use_len_max = mtd->ecclayout->oobavail; + vary_offset = 0; + + /* First test: write all OOB, read it back and verify */ + printk(PRINT_PREF "test 1 of 5\n"); + + err = erase_whole_device(); + if (err) + goto out; + + simple_srand(1); + err = write_whole_device(); + if (err) + goto out; + + simple_srand(1); + err = verify_all_eraseblocks(); + if (err) + goto out; + + /* + * Second test: write all OOB, a block at a time, read it back and + * verify. + */ + printk(PRINT_PREF "test 2 of 5\n"); + + err = erase_whole_device(); + if (err) + goto out; + + simple_srand(3); + err = write_whole_device(); + if (err) + goto out; + + /* Check all eraseblocks */ + simple_srand(3); + printk(PRINT_PREF "verifying all eraseblocks\n"); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = verify_eraseblock_in_one_go(i); + if (err) + goto out; + if (i % 256 == 0) + printk(PRINT_PREF "verified up to eraseblock %u\n", i); + cond_resched(); + } + printk(PRINT_PREF "verified %u eraseblocks\n", i); + + /* + * Third test: write OOB at varying offsets and lengths, read it back + * and verify. + */ + printk(PRINT_PREF "test 3 of 5\n"); + + err = erase_whole_device(); + if (err) + goto out; + + /* Write all eraseblocks */ + use_offset = 0; + use_len = mtd->ecclayout->oobavail; + use_len_max = mtd->ecclayout->oobavail; + vary_offset = 1; + simple_srand(5); + printk(PRINT_PREF "writing OOBs of whole device\n"); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = write_eraseblock(i); + if (err) + goto out; + if (i % 256 == 0) + printk(PRINT_PREF "written up to eraseblock %u\n", i); + cond_resched(); + } + printk(PRINT_PREF "written %u eraseblocks\n", i); + + /* Check all eraseblocks */ + use_offset = 0; + use_len = mtd->ecclayout->oobavail; + use_len_max = mtd->ecclayout->oobavail; + vary_offset = 1; + simple_srand(5); + err = verify_all_eraseblocks(); + if (err) + goto out; + + use_offset = 0; + use_len = mtd->ecclayout->oobavail; + use_len_max = mtd->ecclayout->oobavail; + vary_offset = 0; + + /* Fourth test: try to write off end of device */ + printk(PRINT_PREF "test 4 of 5\n"); + + err = erase_whole_device(); + if (err) + goto out; + + addr0 = 0; + for (i = 0; bbt[i] && i < ebcnt; ++i) + addr0 += mtd->erasesize; + + /* Attempt to write off end of OOB */ + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = 1; + ops.oobretlen = 0; + ops.ooboffs = mtd->ecclayout->oobavail; + ops.datbuf = 0; + ops.oobbuf = writebuf; + printk(PRINT_PREF "attempting to start write past end of OOB\n"); + printk(PRINT_PREF "an error is expected...\n"); + err = mtd->write_oob(mtd, addr0, &ops); + if (err) { + printk(PRINT_PREF "error occurred as expected\n"); + err = 0; + } else { + printk(PRINT_PREF "error: can write past end of OOB\n"); + errcnt += 1; + } + + /* Attempt to read off end of OOB */ + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = 1; + ops.oobretlen = 0; + ops.ooboffs = mtd->ecclayout->oobavail; + ops.datbuf = 0; + ops.oobbuf = readbuf; + printk(PRINT_PREF "attempting to start read past end of OOB\n"); + printk(PRINT_PREF "an error is expected...\n"); + err = mtd->read_oob(mtd, addr0, &ops); + if (err) { + printk(PRINT_PREF "error occurred as expected\n"); + err = 0; + } else { + printk(PRINT_PREF "error: can read past end of OOB\n"); + errcnt += 1; + } + + if (bbt[ebcnt - 1]) + printk(PRINT_PREF "skipping end of device tests because last " + "block is bad\n"); + else { + /* Attempt to write off end of device */ + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->ecclayout->oobavail + 1; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = 0; + ops.oobbuf = writebuf; + printk(PRINT_PREF "attempting to write past end of device\n"); + printk(PRINT_PREF "an error is expected...\n"); + err = mtd->write_oob(mtd, mtd->size - mtd->writesize, &ops); + if (err) { + printk(PRINT_PREF "error occurred as expected\n"); + err = 0; + } else { + printk(PRINT_PREF "error: wrote past end of device\n"); + errcnt += 1; + } + + /* Attempt to read off end of device */ + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->ecclayout->oobavail + 1; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = 0; + ops.oobbuf = readbuf; + printk(PRINT_PREF "attempting to read past end of device\n"); + printk(PRINT_PREF "an error is expected...\n"); + err = mtd->read_oob(mtd, mtd->size - mtd->writesize, &ops); + if (err) { + printk(PRINT_PREF "error occurred as expected\n"); + err = 0; + } else { + printk(PRINT_PREF "error: read past end of device\n"); + errcnt += 1; + } + + err = erase_eraseblock(ebcnt - 1); + if (err) + goto out; + + /* Attempt to write off end of device */ + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->ecclayout->oobavail; + ops.oobretlen = 0; + ops.ooboffs = 1; + ops.datbuf = 0; + ops.oobbuf = writebuf; + printk(PRINT_PREF "attempting to write past end of device\n"); + printk(PRINT_PREF "an error is expected...\n"); + err = mtd->write_oob(mtd, mtd->size - mtd->writesize, &ops); + if (err) { + printk(PRINT_PREF "error occurred as expected\n"); + err = 0; + } else { + printk(PRINT_PREF "error: wrote past end of device\n"); + errcnt += 1; + } + + /* Attempt to read off end of device */ + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->ecclayout->oobavail; + ops.oobretlen = 0; + ops.ooboffs = 1; + ops.datbuf = 0; + ops.oobbuf = readbuf; + printk(PRINT_PREF "attempting to read past end of device\n"); + printk(PRINT_PREF "an error is expected...\n"); + err = mtd->read_oob(mtd, mtd->size - mtd->writesize, &ops); + if (err) { + printk(PRINT_PREF "error occurred as expected\n"); + err = 0; + } else { + printk(PRINT_PREF "error: read past end of device\n"); + errcnt += 1; + } + } + + /* Fifth test: write / read across block boundaries */ + printk(PRINT_PREF "test 5 of 5\n"); + + /* Erase all eraseblocks */ + err = erase_whole_device(); + if (err) + goto out; + + /* Write all eraseblocks */ + simple_srand(11); + printk(PRINT_PREF "writing OOBs of whole device\n"); + for (i = 0; i < ebcnt - 1; ++i) { + int cnt = 2; + int pg; + size_t sz = mtd->ecclayout->oobavail; + if (bbt[i] || bbt[i + 1]) + continue; + addr = (i + 1) * mtd->erasesize - mtd->writesize; + for (pg = 0; pg < cnt; ++pg) { + set_random_data(writebuf, sz); + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = sz; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = 0; + ops.oobbuf = writebuf; + err = mtd->write_oob(mtd, addr, &ops); + if (err) + goto out; + if (i % 256 == 0) + printk(PRINT_PREF "written up to eraseblock " + "%u\n", i); + cond_resched(); + addr += mtd->writesize; + } + } + printk(PRINT_PREF "written %u eraseblocks\n", i); + + /* Check all eraseblocks */ + simple_srand(11); + printk(PRINT_PREF "verifying all eraseblocks\n"); + for (i = 0; i < ebcnt - 1; ++i) { + if (bbt[i] || bbt[i + 1]) + continue; + set_random_data(writebuf, mtd->ecclayout->oobavail * 2); + addr = (i + 1) * mtd->erasesize - mtd->writesize; + ops.mode = MTD_OOB_AUTO; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->ecclayout->oobavail * 2; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = 0; + ops.oobbuf = readbuf; + err = mtd->read_oob(mtd, addr, &ops); + if (err) + goto out; + if (memcmp(readbuf, writebuf, mtd->ecclayout->oobavail * 2)) { + printk(PRINT_PREF "error: verify failed at %#llx\n", + (long long)addr); + errcnt += 1; + if (errcnt > 1000) { + printk(PRINT_PREF "error: too many errors\n"); + goto out; + } + } + if (i % 256 == 0) + printk(PRINT_PREF "verified up to eraseblock %u\n", i); + cond_resched(); + } + printk(PRINT_PREF "verified %u eraseblocks\n", i); + + printk(PRINT_PREF "finished with %d errors\n", errcnt); +out: + kfree(bbt); + kfree(writebuf); + kfree(readbuf); + put_mtd_device(mtd); + if (err) + printk(PRINT_PREF "error %d occurred\n", err); + printk(KERN_INFO "=================================================\n"); + return err; +} +module_init(mtd_oobtest_init); + +static void __exit mtd_oobtest_exit(void) +{ + return; +} +module_exit(mtd_oobtest_exit); + +MODULE_DESCRIPTION("Out-of-band test module"); +MODULE_AUTHOR("Adrian Hunter"); +MODULE_LICENSE("GPL");