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1001ff7a4f
These multiplications are done with 32-bit arithmetic, then converted to 64-bit. We should widen the integers first to prevent overflow. This could be a problem for large (>4GB) MTD's. Detected by Coverity. Signed-off-by: Brian Norris <computersforpeace@gmail.com> Cc: Akinobu Mita <akinobu.mita@gmail.com>
114 lines
2.2 KiB
C
114 lines
2.2 KiB
C
#define pr_fmt(fmt) "mtd_test: " fmt
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/printk.h>
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#include "mtd_test.h"
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int mtdtest_erase_eraseblock(struct mtd_info *mtd, unsigned int ebnum)
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{
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int err;
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struct erase_info ei;
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loff_t addr = (loff_t)ebnum * mtd->erasesize;
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memset(&ei, 0, sizeof(struct erase_info));
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ei.mtd = mtd;
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ei.addr = addr;
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ei.len = mtd->erasesize;
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err = mtd_erase(mtd, &ei);
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if (err) {
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pr_info("error %d while erasing EB %d\n", err, ebnum);
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return err;
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}
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if (ei.state == MTD_ERASE_FAILED) {
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pr_info("some erase error occurred at EB %d\n", ebnum);
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return -EIO;
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}
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return 0;
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}
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static int is_block_bad(struct mtd_info *mtd, unsigned int ebnum)
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{
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int ret;
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loff_t addr = (loff_t)ebnum * mtd->erasesize;
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ret = mtd_block_isbad(mtd, addr);
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if (ret)
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pr_info("block %d is bad\n", ebnum);
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return ret;
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}
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int mtdtest_scan_for_bad_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
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unsigned int eb, int ebcnt)
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{
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int i, bad = 0;
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if (!mtd_can_have_bb(mtd))
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return 0;
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pr_info("scanning for bad eraseblocks\n");
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for (i = 0; i < ebcnt; ++i) {
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bbt[i] = is_block_bad(mtd, eb + i) ? 1 : 0;
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if (bbt[i])
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bad += 1;
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cond_resched();
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}
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pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);
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return 0;
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}
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int mtdtest_erase_good_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
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unsigned int eb, int ebcnt)
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{
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int err;
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unsigned int i;
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = mtdtest_erase_eraseblock(mtd, eb + i);
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if (err)
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return err;
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cond_resched();
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}
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return 0;
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}
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int mtdtest_read(struct mtd_info *mtd, loff_t addr, size_t size, void *buf)
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{
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size_t read;
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int err;
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err = mtd_read(mtd, addr, size, &read, buf);
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/* Ignore corrected ECC errors */
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if (mtd_is_bitflip(err))
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err = 0;
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if (!err && read != size)
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err = -EIO;
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if (err)
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pr_err("error: read failed at %#llx\n", addr);
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return err;
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}
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int mtdtest_write(struct mtd_info *mtd, loff_t addr, size_t size,
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const void *buf)
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{
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size_t written;
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int err;
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err = mtd_write(mtd, addr, size, &written, buf);
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if (!err && written != size)
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err = -EIO;
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if (err)
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pr_err("error: write failed at %#llx\n", addr);
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return err;
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}
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