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path: root/drivers/mtd/ubi/io.c
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Diffstat (limited to 'drivers/mtd/ubi/io.c')
-rw-r--r--drivers/mtd/ubi/io.c120
1 files changed, 95 insertions, 25 deletions
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 8aa51e7a6a7..b4ecc84c754 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -143,7 +143,7 @@ int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
err = paranoid_check_not_bad(ubi, pnum);
if (err)
- return err > 0 ? -EINVAL : err;
+ return err;
addr = (loff_t)pnum * ubi->peb_size + offset;
retry:
@@ -236,12 +236,12 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
err = paranoid_check_not_bad(ubi, pnum);
if (err)
- return err > 0 ? -EINVAL : err;
+ return err;
/* The area we are writing to has to contain all 0xFF bytes */
err = ubi_dbg_check_all_ff(ubi, pnum, offset, len);
if (err)
- return err > 0 ? -EINVAL : err;
+ return err;
if (offset >= ubi->leb_start) {
/*
@@ -250,10 +250,10 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
*/
err = paranoid_check_peb_ec_hdr(ubi, pnum);
if (err)
- return err > 0 ? -EINVAL : err;
+ return err;
err = paranoid_check_peb_vid_hdr(ubi, pnum);
if (err)
- return err > 0 ? -EINVAL : err;
+ return err;
}
if (ubi_dbg_is_write_failure()) {
@@ -273,6 +273,21 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
} else
ubi_assert(written == len);
+ if (!err) {
+ err = ubi_dbg_check_write(ubi, buf, pnum, offset, len);
+ if (err)
+ return err;
+
+ /*
+ * Since we always write sequentially, the rest of the PEB has
+ * to contain only 0xFF bytes.
+ */
+ offset += len;
+ len = ubi->peb_size - offset;
+ if (len)
+ err = ubi_dbg_check_all_ff(ubi, pnum, offset, len);
+ }
+
return err;
}
@@ -348,7 +363,7 @@ retry:
err = ubi_dbg_check_all_ff(ubi, pnum, 0, ubi->peb_size);
if (err)
- return err > 0 ? -EINVAL : err;
+ return err;
if (ubi_dbg_is_erase_failure() && !err) {
dbg_err("cannot erase PEB %d (emulated)", pnum);
@@ -542,7 +557,7 @@ int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture)
err = paranoid_check_not_bad(ubi, pnum);
if (err != 0)
- return err > 0 ? -EINVAL : err;
+ return err;
if (ubi->ro_mode) {
ubi_err("read-only mode");
@@ -819,7 +834,7 @@ int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
err = paranoid_check_ec_hdr(ubi, pnum, ec_hdr);
if (err)
- return -EINVAL;
+ return err;
err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize);
return err;
@@ -1083,7 +1098,7 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
err = paranoid_check_peb_ec_hdr(ubi, pnum);
if (err)
- return err > 0 ? -EINVAL : err;
+ return err;
vid_hdr->magic = cpu_to_be32(UBI_VID_HDR_MAGIC);
vid_hdr->version = UBI_VERSION;
@@ -1092,7 +1107,7 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
err = paranoid_check_vid_hdr(ubi, pnum, vid_hdr);
if (err)
- return -EINVAL;
+ return err;
p = (char *)vid_hdr - ubi->vid_hdr_shift;
err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset,
@@ -1107,8 +1122,8 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
* @ubi: UBI device description object
* @pnum: physical eraseblock number to check
*
- * This function returns zero if the physical eraseblock is good, a positive
- * number if it is bad and a negative error code if an error occurred.
+ * This function returns zero if the physical eraseblock is good, %-EINVAL if
+ * it is bad and a negative error code if an error occurred.
*/
static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum)
{
@@ -1120,7 +1135,7 @@ static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum)
ubi_err("paranoid check failed for PEB %d", pnum);
ubi_dbg_dump_stack();
- return err;
+ return err > 0 ? -EINVAL : err;
}
/**
@@ -1130,7 +1145,7 @@ static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum)
* @ec_hdr: the erase counter header to check
*
* This function returns zero if the erase counter header contains valid
- * values, and %1 if not.
+ * values, and %-EINVAL if not.
*/
static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum,
const struct ubi_ec_hdr *ec_hdr)
@@ -1156,7 +1171,7 @@ static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum,
fail:
ubi_dbg_dump_ec_hdr(ec_hdr);
ubi_dbg_dump_stack();
- return 1;
+ return -EINVAL;
}
/**
@@ -1164,8 +1179,8 @@ fail:
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to check
*
- * This function returns zero if the erase counter header is all right, %1 if
- * not, and a negative error code if an error occurred.
+ * This function returns zero if the erase counter header is all right and and
+ * a negative error code if not or if an error occurred.
*/
static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum)
{
@@ -1188,7 +1203,7 @@ static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum)
ubi_err("paranoid check failed for PEB %d", pnum);
ubi_dbg_dump_ec_hdr(ec_hdr);
ubi_dbg_dump_stack();
- err = 1;
+ err = -EINVAL;
goto exit;
}
@@ -1206,7 +1221,7 @@ exit:
* @vid_hdr: the volume identifier header to check
*
* This function returns zero if the volume identifier header is all right, and
- * %1 if not.
+ * %-EINVAL if not.
*/
static int paranoid_check_vid_hdr(const struct ubi_device *ubi, int pnum,
const struct ubi_vid_hdr *vid_hdr)
@@ -1233,7 +1248,7 @@ fail:
ubi_err("paranoid check failed for PEB %d", pnum);
ubi_dbg_dump_vid_hdr(vid_hdr);
ubi_dbg_dump_stack();
- return 1;
+ return -EINVAL;
}
@@ -1243,7 +1258,7 @@ fail:
* @pnum: the physical eraseblock number to check
*
* This function returns zero if the volume identifier header is all right,
- * %1 if not, and a negative error code if an error occurred.
+ * and a negative error code if not or if an error occurred.
*/
static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum)
{
@@ -1270,7 +1285,7 @@ static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum)
ubi_err("paranoid check failed for PEB %d", pnum);
ubi_dbg_dump_vid_hdr(vid_hdr);
ubi_dbg_dump_stack();
- err = 1;
+ err = -EINVAL;
goto exit;
}
@@ -1282,6 +1297,61 @@ exit:
}
/**
+ * ubi_dbg_check_write - make sure write succeeded.
+ * @ubi: UBI device description object
+ * @buf: buffer with data which were written
+ * @pnum: physical eraseblock number the data were written to
+ * @offset: offset within the physical eraseblock the data were written to
+ * @len: how many bytes were written
+ *
+ * This functions reads data which were recently written and compares it with
+ * the original data buffer - the data have to match. Returns zero if the data
+ * match and a negative error code if not or in case of failure.
+ */
+int ubi_dbg_check_write(struct ubi_device *ubi, const void *buf, int pnum,
+ int offset, int len)
+{
+ int err, i;
+
+ mutex_lock(&ubi->dbg_buf_mutex);
+ err = ubi_io_read(ubi, ubi->dbg_peb_buf, pnum, offset, len);
+ if (err)
+ goto out_unlock;
+
+ for (i = 0; i < len; i++) {
+ uint8_t c = ((uint8_t *)buf)[i];
+ uint8_t c1 = ((uint8_t *)ubi->dbg_peb_buf)[i];
+ int dump_len;
+
+ if (c == c1)
+ continue;
+
+ ubi_err("paranoid check failed for PEB %d:%d, len %d",
+ pnum, offset, len);
+ ubi_msg("data differ at position %d", i);
+ dump_len = max_t(int, 128, len - i);
+ ubi_msg("hex dump of the original buffer from %d to %d",
+ i, i + dump_len);
+ print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
+ buf + i, dump_len, 1);
+ ubi_msg("hex dump of the read buffer from %d to %d",
+ i, i + dump_len);
+ print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
+ ubi->dbg_peb_buf + i, dump_len, 1);
+ ubi_dbg_dump_stack();
+ err = -EINVAL;
+ goto out_unlock;
+ }
+ mutex_unlock(&ubi->dbg_buf_mutex);
+
+ return 0;
+
+out_unlock:
+ mutex_unlock(&ubi->dbg_buf_mutex);
+ return err;
+}
+
+/**
* ubi_dbg_check_all_ff - check that a region of flash is empty.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to check
@@ -1289,8 +1359,8 @@ exit:
* @len: the length of the region to check
*
* This function returns zero if only 0xFF bytes are present at offset
- * @offset of the physical eraseblock @pnum, %1 if not, and a negative error
- * code if an error occurred.
+ * @offset of the physical eraseblock @pnum, and a negative error code if not
+ * or if an error occurred.
*/
int ubi_dbg_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len)
{
@@ -1321,7 +1391,7 @@ fail:
ubi_msg("hex dump of the %d-%d region", offset, offset + len);
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
ubi->dbg_peb_buf, len, 1);
- err = 1;
+ err = -EINVAL;
error:
ubi_dbg_dump_stack();
mutex_unlock(&ubi->dbg_buf_mutex);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-28 22:54:06 +0000