/**
* ubi_io_sync_erase - synchronously erase a physical eraseblock.
* @ubi: UBI device description object
* @pnum: physical eraseblock number to erase
* @torture: if this physical eraseblock has to be tortured
*
* This function synchronously erases physical eraseblock @pnum. If @torture
* flag is not zero, the physical eraseblock is checked by means of writing
* different patterns to it and reading them back. If the torturing is enabled,
* the physical eraseblock is erased more than once.
*
* This function returns the number of erasures made in case of success, %-EIO
* if the erasure failed or the torturing test failed, and other negative error
* codes in case of other errors. Note, %-EIO means that the physical
* eraseblock is bad.
*/
int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture)
{
int err, ret = 0;
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
err = self_check_not_bad(ubi, pnum);
if (err != 0)
return err;
if (ubi->ro_mode) {
ubi_err(ubi, "read-only mode");
return -EROFS;
}
if (ubi->nor_flash) {
err = nor_erase_prepare(ubi, pnum);
if (err)
return err;
}
if (torture) {
ret = torture_peb(ubi, pnum);
if (ret < 0)
return ret;
}
err = do_sync_erase(ubi, pnum);
if (err)
return err;
return ret + 1;
}
/**
* ubi_io_sync_erase - synchronously erase a physical eraseblock.
* @ubi: UBI device description object
* @pnum: physical eraseblock number to erase
* @torture: if this physical eraseblock has to be tortured
*
* This function synchronously erases physical eraseblock @pnum. If @torture
* flag is not zero, the physical eraseblock is checked by means of writing
* different patterns to it and reading them back. If the torturing is enabled,
* the physical eraseblock is erased more then once.
*
* This function returns the number of erasures made in case of success, %-EIO
* if the erasure failed or the torturing test failed, and other negative error
* codes in case of other errors. Note, %-EIO means that the physical
* eraseblock is bad.
*/
int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture)
{
int err, ret = 0;
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
err = paranoid_check_not_bad(ubi, pnum);
if (err != 0)
return err > 0 ? -EINVAL : err;
if (ubi->ro_mode) {
ubi_err("read-only mode");
return -EROFS;
}
if (torture) {
ret = torture_peb(ubi, pnum);
if (ret < 0)
return ret;
}
err = do_sync_erase(ubi, pnum);
if (err)
return err;
return ret + 1;
}
/**
* torture_peb - test a supposedly bad physical eraseblock.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to test
*
* This function returns %-EIO if the physical eraseblock did not pass the
* test, a positive number of erase operations done if the test was
* successfully passed, and other negative error codes in case of other errors.
*/
static int torture_peb(struct ubi_device *ubi, int pnum)
{
int err, i, patt_count;
ubi_msg(ubi, "run torture test for PEB %d", pnum);
patt_count = ARRAY_SIZE(patterns);
ubi_assert(patt_count > 0);
mutex_lock(&ubi->buf_mutex);
for (i = 0; i < patt_count; i++) {
err = do_sync_erase(ubi, pnum);
if (err)
goto out;
/* Make sure the PEB contains only 0xFF bytes */
err = ubi_io_read(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size);
if (err)
goto out;
err = ubi_check_pattern(ubi->peb_buf, 0xFF, ubi->peb_size);
if (err == 0) {
ubi_err(ubi, "erased PEB %d, but a non-0xFF byte found",
pnum);
err = -EIO;
goto out;
}
/* Write a pattern and check it */
memset(ubi->peb_buf, patterns[i], ubi->peb_size);
err = ubi_io_write(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size);
if (err)
goto out;
memset(ubi->peb_buf, ~patterns[i], ubi->peb_size);
err = ubi_io_read(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size);
if (err)
goto out;
err = ubi_check_pattern(ubi->peb_buf, patterns[i],
ubi->peb_size);
if (err == 0) {
ubi_err(ubi, "pattern %x checking failed for PEB %d",
patterns[i], pnum);
err = -EIO;
goto out;
}
}
err = patt_count;
ubi_msg(ubi, "PEB %d passed torture test, do not mark it as bad", pnum);
out:
mutex_unlock(&ubi->buf_mutex);
if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err)) {
/*
* If a bit-flip or data integrity error was detected, the test
* has not passed because it happened on a freshly erased
* physical eraseblock which means something is wrong with it.
*/
ubi_err(ubi, "read problems on freshly erased PEB %d, must be bad",
pnum);
err = -EIO;
}
return err;
}
