From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- drivers/mtd/tests/oobtest.c | 733 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 733 insertions(+) create mode 100644 drivers/mtd/tests/oobtest.c (limited to 'drivers/mtd/tests/oobtest.c') diff --git a/drivers/mtd/tests/oobtest.c b/drivers/mtd/tests/oobtest.c new file mode 100644 index 000000000..e1ee68f8b --- /dev/null +++ b/drivers/mtd/tests/oobtest.c @@ -0,0 +1,733 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2006-2008 Nokia Corporation + * + * Test OOB read and write on MTD device. + * + * Author: Adrian Hunter + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "mtd_test.h" + +static int dev = -EINVAL; +static int bitflip_limit; +module_param(dev, int, S_IRUGO); +MODULE_PARM_DESC(dev, "MTD device number to use"); +module_param(bitflip_limit, int, S_IRUGO); +MODULE_PARM_DESC(bitflip_limit, "Max. allowed bitflips per page"); + +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 struct rnd_state rnd_state; + +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 = (loff_t)ebnum * mtd->erasesize; + + prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt); + for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) { + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = use_len; + ops.oobretlen = 0; + ops.ooboffs = use_offset; + ops.datbuf = NULL; + ops.oobbuf = writebuf + (use_len_max * i) + use_offset; + err = mtd_write_oob(mtd, addr, &ops); + if (err || ops.oobretlen != use_len) { + pr_err("error: writeoob failed at %#llx\n", + (long long)addr); + pr_err("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; + + pr_info("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) + pr_info("written up to eraseblock %u\n", i); + + err = mtdtest_relax(); + if (err) + return err; + } + pr_info("written %u eraseblocks\n", i); + return 0; +} + +/* + * Display the address, offset and data bytes at comparison failure. + * Return number of bitflips encountered. + */ +static size_t memcmpshowoffset(loff_t addr, loff_t offset, const void *cs, + const void *ct, size_t count) +{ + const unsigned char *su1, *su2; + int res; + size_t i = 0; + size_t bitflips = 0; + + for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--, i++) { + res = *su1 ^ *su2; + if (res) { + pr_info("error @addr[0x%lx:0x%lx] 0x%x -> 0x%x diff 0x%x\n", + (unsigned long)addr, (unsigned long)offset + i, + *su1, *su2, res); + bitflips += hweight8(res); + } + } + + return bitflips; +} + +#define memcmpshow(addr, cs, ct, count) memcmpshowoffset((addr), 0, (cs), (ct),\ + (count)) + +/* + * Compare with 0xff and show the address, offset and data bytes at + * comparison failure. Return number of bitflips encountered. + */ +static size_t memffshow(loff_t addr, loff_t offset, const void *cs, + size_t count) +{ + const unsigned char *su1; + int res; + size_t i = 0; + size_t bitflips = 0; + + for (su1 = cs; 0 < count; ++su1, count--, i++) { + res = *su1 ^ 0xff; + if (res) { + pr_info("error @addr[0x%lx:0x%lx] 0x%x -> 0xff diff 0x%x\n", + (unsigned long)addr, (unsigned long)offset + i, + *su1, res); + bitflips += hweight8(res); + } + } + + return bitflips; +} + +static int verify_eraseblock(int ebnum) +{ + int i; + struct mtd_oob_ops ops = { }; + int err = 0; + loff_t addr = (loff_t)ebnum * mtd->erasesize; + size_t bitflips; + + prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt); + for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) { + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = use_len; + ops.oobretlen = 0; + ops.ooboffs = use_offset; + ops.datbuf = NULL; + ops.oobbuf = readbuf; + err = mtd_read_oob(mtd, addr, &ops); + if (mtd_is_bitflip(err)) + err = 0; + + if (err || ops.oobretlen != use_len) { + pr_err("error: readoob failed at %#llx\n", + (long long)addr); + errcnt += 1; + return err ? err : -1; + } + + bitflips = memcmpshow(addr, readbuf, + writebuf + (use_len_max * i) + use_offset, + use_len); + if (bitflips > bitflip_limit) { + pr_err("error: verify failed at %#llx\n", + (long long)addr); + errcnt += 1; + if (errcnt > 1000) { + pr_err("error: too many errors\n"); + return -1; + } + } else if (bitflips) { + pr_info("ignoring error as within bitflip_limit\n"); + } + + if (use_offset != 0 || use_len < mtd->oobavail) { + int k; + + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->oobavail; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = NULL; + ops.oobbuf = readbuf; + err = mtd_read_oob(mtd, addr, &ops); + if (mtd_is_bitflip(err)) + err = 0; + + if (err || ops.oobretlen != mtd->oobavail) { + pr_err("error: readoob failed at %#llx\n", + (long long)addr); + errcnt += 1; + return err ? err : -1; + } + bitflips = memcmpshowoffset(addr, use_offset, + readbuf + use_offset, + writebuf + (use_len_max * i) + use_offset, + use_len); + + /* verify pre-offset area for 0xff */ + bitflips += memffshow(addr, 0, readbuf, use_offset); + + /* verify post-(use_offset + use_len) area for 0xff */ + k = use_offset + use_len; + bitflips += memffshow(addr, k, readbuf + k, + mtd->oobavail - k); + + if (bitflips > bitflip_limit) { + pr_err("error: verify failed at %#llx\n", + (long long)addr); + errcnt += 1; + if (errcnt > 1000) { + pr_err("error: too many errors\n"); + return -1; + } + } else if (bitflips) { + pr_info("ignoring errors as within bitflip limit\n"); + } + } + 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 = (loff_t)ebnum * mtd->erasesize; + size_t len = mtd->oobavail * pgcnt; + size_t oobavail = mtd->oobavail; + size_t bitflips; + int i; + + prandom_bytes_state(&rnd_state, writebuf, len); + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = len; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = NULL; + ops.oobbuf = readbuf; + + /* read entire block's OOB at one go */ + err = mtd_read_oob(mtd, addr, &ops); + if (mtd_is_bitflip(err)) + err = 0; + + if (err || ops.oobretlen != len) { + pr_err("error: readoob failed at %#llx\n", + (long long)addr); + errcnt += 1; + return err ? err : -1; + } + + /* verify one page OOB at a time for bitflip per page limit check */ + for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) { + bitflips = memcmpshow(addr, readbuf + (i * oobavail), + writebuf + (i * oobavail), oobavail); + if (bitflips > bitflip_limit) { + pr_err("error: verify failed at %#llx\n", + (long long)addr); + errcnt += 1; + if (errcnt > 1000) { + pr_err("error: too many errors\n"); + return -1; + } + } else if (bitflips) { + pr_info("ignoring error as within bitflip_limit\n"); + } + } + + return err; +} + +static int verify_all_eraseblocks(void) +{ + int err; + unsigned int i; + + pr_info("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) + pr_info("verified up to eraseblock %u\n", i); + + err = mtdtest_relax(); + if (err) + return err; + } + pr_info("verified %u eraseblocks\n", i); + 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"); + + if (dev < 0) { + pr_info("Please specify a valid mtd-device via module parameter\n"); + pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n"); + return -EINVAL; + } + + pr_info("MTD device: %d\n", dev); + + mtd = get_mtd_device(NULL, dev); + if (IS_ERR(mtd)) { + err = PTR_ERR(mtd); + pr_err("error: cannot get MTD device\n"); + return err; + } + + if (!mtd_type_is_nand(mtd)) { + pr_info("this test requires NAND flash\n"); + goto out; + } + + tmp = mtd->size; + do_div(tmp, mtd->erasesize); + ebcnt = tmp; + pgcnt = mtd->erasesize / mtd->writesize; + + pr_info("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; + readbuf = kmalloc(mtd->erasesize, GFP_KERNEL); + if (!readbuf) + goto out; + writebuf = kmalloc(mtd->erasesize, GFP_KERNEL); + if (!writebuf) + goto out; + bbt = kzalloc(ebcnt, GFP_KERNEL); + if (!bbt) + goto out; + + err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt); + if (err) + goto out; + + use_offset = 0; + use_len = mtd->oobavail; + use_len_max = mtd->oobavail; + vary_offset = 0; + + /* First test: write all OOB, read it back and verify */ + pr_info("test 1 of 5\n"); + + err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); + if (err) + goto out; + + prandom_seed_state(&rnd_state, 1); + err = write_whole_device(); + if (err) + goto out; + + prandom_seed_state(&rnd_state, 1); + err = verify_all_eraseblocks(); + if (err) + goto out; + + /* + * Second test: write all OOB, a block at a time, read it back and + * verify. + */ + pr_info("test 2 of 5\n"); + + err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); + if (err) + goto out; + + prandom_seed_state(&rnd_state, 3); + err = write_whole_device(); + if (err) + goto out; + + /* Check all eraseblocks */ + prandom_seed_state(&rnd_state, 3); + pr_info("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) + pr_info("verified up to eraseblock %u\n", i); + + err = mtdtest_relax(); + if (err) + goto out; + } + pr_info("verified %u eraseblocks\n", i); + + /* + * Third test: write OOB at varying offsets and lengths, read it back + * and verify. + */ + pr_info("test 3 of 5\n"); + + err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); + if (err) + goto out; + + /* Write all eraseblocks */ + use_offset = 0; + use_len = mtd->oobavail; + use_len_max = mtd->oobavail; + vary_offset = 1; + prandom_seed_state(&rnd_state, 5); + + err = write_whole_device(); + if (err) + goto out; + + /* Check all eraseblocks */ + use_offset = 0; + use_len = mtd->oobavail; + use_len_max = mtd->oobavail; + vary_offset = 1; + prandom_seed_state(&rnd_state, 5); + err = verify_all_eraseblocks(); + if (err) + goto out; + + use_offset = 0; + use_len = mtd->oobavail; + use_len_max = mtd->oobavail; + vary_offset = 0; + + /* Fourth test: try to write off end of device */ + pr_info("test 4 of 5\n"); + + err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); + if (err) + goto out; + + addr0 = 0; + for (i = 0; i < ebcnt && bbt[i]; ++i) + addr0 += mtd->erasesize; + + /* Attempt to write off end of OOB */ + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = 1; + ops.oobretlen = 0; + ops.ooboffs = mtd->oobavail; + ops.datbuf = NULL; + ops.oobbuf = writebuf; + pr_info("attempting to start write past end of OOB\n"); + pr_info("an error is expected...\n"); + err = mtd_write_oob(mtd, addr0, &ops); + if (err) { + pr_info("error occurred as expected\n"); + } else { + pr_err("error: can write past end of OOB\n"); + errcnt += 1; + } + + /* Attempt to read off end of OOB */ + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = 1; + ops.oobretlen = 0; + ops.ooboffs = mtd->oobavail; + ops.datbuf = NULL; + ops.oobbuf = readbuf; + pr_info("attempting to start read past end of OOB\n"); + pr_info("an error is expected...\n"); + err = mtd_read_oob(mtd, addr0, &ops); + if (mtd_is_bitflip(err)) + err = 0; + + if (err) { + pr_info("error occurred as expected\n"); + } else { + pr_err("error: can read past end of OOB\n"); + errcnt += 1; + } + + if (bbt[ebcnt - 1]) + pr_info("skipping end of device tests because last " + "block is bad\n"); + else { + /* Attempt to write off end of device */ + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->oobavail + 1; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = NULL; + ops.oobbuf = writebuf; + pr_info("attempting to write past end of device\n"); + pr_info("an error is expected...\n"); + err = mtd_write_oob(mtd, mtd->size - mtd->writesize, &ops); + if (err) { + pr_info("error occurred as expected\n"); + } else { + pr_err("error: wrote past end of device\n"); + errcnt += 1; + } + + /* Attempt to read off end of device */ + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->oobavail + 1; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = NULL; + ops.oobbuf = readbuf; + pr_info("attempting to read past end of device\n"); + pr_info("an error is expected...\n"); + err = mtd_read_oob(mtd, mtd->size - mtd->writesize, &ops); + if (mtd_is_bitflip(err)) + err = 0; + + if (err) { + pr_info("error occurred as expected\n"); + } else { + pr_err("error: read past end of device\n"); + errcnt += 1; + } + + err = mtdtest_erase_eraseblock(mtd, ebcnt - 1); + if (err) + goto out; + + /* Attempt to write off end of device */ + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->oobavail; + ops.oobretlen = 0; + ops.ooboffs = 1; + ops.datbuf = NULL; + ops.oobbuf = writebuf; + pr_info("attempting to write past end of device\n"); + pr_info("an error is expected...\n"); + err = mtd_write_oob(mtd, mtd->size - mtd->writesize, &ops); + if (err) { + pr_info("error occurred as expected\n"); + } else { + pr_err("error: wrote past end of device\n"); + errcnt += 1; + } + + /* Attempt to read off end of device */ + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->oobavail; + ops.oobretlen = 0; + ops.ooboffs = 1; + ops.datbuf = NULL; + ops.oobbuf = readbuf; + pr_info("attempting to read past end of device\n"); + pr_info("an error is expected...\n"); + err = mtd_read_oob(mtd, mtd->size - mtd->writesize, &ops); + if (mtd_is_bitflip(err)) + err = 0; + + if (err) { + pr_info("error occurred as expected\n"); + } else { + pr_err("error: read past end of device\n"); + errcnt += 1; + } + } + + /* Fifth test: write / read across block boundaries */ + pr_info("test 5 of 5\n"); + + /* Erase all eraseblocks */ + err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); + if (err) + goto out; + + /* Write all eraseblocks */ + prandom_seed_state(&rnd_state, 11); + pr_info("writing OOBs of whole device\n"); + for (i = 0; i < ebcnt - 1; ++i) { + int cnt = 2; + int pg; + size_t sz = mtd->oobavail; + if (bbt[i] || bbt[i + 1]) + continue; + addr = (loff_t)(i + 1) * mtd->erasesize - mtd->writesize; + prandom_bytes_state(&rnd_state, writebuf, sz * cnt); + for (pg = 0; pg < cnt; ++pg) { + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = sz; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = NULL; + ops.oobbuf = writebuf + pg * sz; + err = mtd_write_oob(mtd, addr, &ops); + if (err) + goto out; + if (i % 256 == 0) + pr_info("written up to eraseblock %u\n", i); + + err = mtdtest_relax(); + if (err) + goto out; + + addr += mtd->writesize; + } + } + pr_info("written %u eraseblocks\n", i); + + /* Check all eraseblocks */ + prandom_seed_state(&rnd_state, 11); + pr_info("verifying all eraseblocks\n"); + for (i = 0; i < ebcnt - 1; ++i) { + if (bbt[i] || bbt[i + 1]) + continue; + prandom_bytes_state(&rnd_state, writebuf, mtd->oobavail * 2); + addr = (loff_t)(i + 1) * mtd->erasesize - mtd->writesize; + ops.mode = MTD_OPS_AUTO_OOB; + ops.len = 0; + ops.retlen = 0; + ops.ooblen = mtd->oobavail * 2; + ops.oobretlen = 0; + ops.ooboffs = 0; + ops.datbuf = NULL; + ops.oobbuf = readbuf; + err = mtd_read_oob(mtd, addr, &ops); + if (mtd_is_bitflip(err)) + err = 0; + + if (err) + goto out; + if (memcmpshow(addr, readbuf, writebuf, + mtd->oobavail * 2)) { + pr_err("error: verify failed at %#llx\n", + (long long)addr); + errcnt += 1; + if (errcnt > 1000) { + err = -EINVAL; + pr_err("error: too many errors\n"); + goto out; + } + } + if (i % 256 == 0) + pr_info("verified up to eraseblock %u\n", i); + + err = mtdtest_relax(); + if (err) + goto out; + } + pr_info("verified %u eraseblocks\n", i); + + pr_info("finished with %d errors\n", errcnt); +out: + kfree(bbt); + kfree(writebuf); + kfree(readbuf); + put_mtd_device(mtd); + if (err) + pr_info("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"); -- cgit v1.3.1