@@ -720,16 +720,16 @@ bad:
int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
struct ubi_ec_hdr *ec_hdr, int verbose)
{
- int err, read_err = 0;
+ int err, read_err;
uint32_t crc, magic, hdr_crc;
dbg_io("read EC header from PEB %d", pnum);
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
- err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE);
- if (err) {
- if (err != UBI_IO_BITFLIPS && err != -EBADMSG)
- return err;
+ read_err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE);
+ if (read_err) {
+ if (read_err != UBI_IO_BITFLIPS && read_err != -EBADMSG)
+ return read_err;
/*
* We read all the data, but either a correctable bit-flip
@@ -740,14 +740,12 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
* this. If the EC header is still OK, we just report this as
* there was a bit-flip, to force scrubbing.
*/
- if (err == -EBADMSG)
- read_err = UBI_IO_BAD_HDR_EBADMSG;
}
magic = be32_to_cpu(ec_hdr->magic);
if (magic != UBI_EC_HDR_MAGIC) {
- if (read_err)
- return read_err;
+ if (read_err == -EBADMSG)
+ return UBI_IO_BAD_HDR_EBADMSG;
/*
* The magic field is wrong. Let's check if we have read all
@@ -762,7 +760,10 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
else if (UBI_IO_DEBUG)
dbg_msg("no EC header found at PEB %d, "
"only 0xFF bytes", pnum);
- return UBI_IO_FF;
+ if (!read_err)
+ return UBI_IO_FF;
+ else
+ return UBI_IO_FF_BITFLIPS;
}
/*
@@ -790,7 +791,11 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
} else if (UBI_IO_DEBUG)
dbg_msg("bad EC header CRC at PEB %d, calculated "
"%#08x, read %#08x", pnum, crc, hdr_crc);
- return read_err ?: UBI_IO_BAD_HDR;
+
+ if (!read_err)
+ return UBI_IO_BAD_HDR;
+ else
+ return UBI_IO_BAD_HDR_EBADMSG;
}
/* And of course validate what has just been read from the media */
@@ -986,7 +991,7 @@ bad:
int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
struct ubi_vid_hdr *vid_hdr, int verbose)
{
- int err, read_err = 0;
+ int err, read_err;
uint32_t crc, magic, hdr_crc;
void *p;
@@ -994,20 +999,15 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
p = (char *)vid_hdr - ubi->vid_hdr_shift;
- err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
+ read_err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
ubi->vid_hdr_alsize);
- if (err) {
- if (err != UBI_IO_BITFLIPS && err != -EBADMSG)
- return err;
-
- if (err == -EBADMSG)
- read_err = UBI_IO_BAD_HDR_EBADMSG;
- }
+ if (read_err && read_err != UBI_IO_BITFLIPS && read_err != -EBADMSG)
+ return read_err;
magic = be32_to_cpu(vid_hdr->magic);
if (magic != UBI_VID_HDR_MAGIC) {
- if (read_err)
- return read_err;
+ if (read_err == -EBADMSG)
+ return UBI_IO_BAD_HDR_EBADMSG;
if (check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) {
if (verbose)
@@ -1016,7 +1016,10 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
else if (UBI_IO_DEBUG)
dbg_msg("no VID header found at PEB %d, "
"only 0xFF bytes", pnum);
- return UBI_IO_FF;
+ if (!read_err)
+ return UBI_IO_FF;
+ else
+ return UBI_IO_FF_BITFLIPS;
}
if (verbose) {
@@ -1040,7 +1043,10 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
} else if (UBI_IO_DEBUG)
dbg_msg("bad CRC at PEB %d, calculated %#08x, "
"read %#08x", pnum, crc, hdr_crc);
- return read_err ?: UBI_IO_BAD_HDR;
+ if (!read_err)
+ return UBI_IO_BAD_HDR;
+ else
+ return UBI_IO_BAD_HDR_EBADMSG;
}
err = validate_vid_hdr(ubi, vid_hdr);
@@ -748,7 +748,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
return err;
else if (err == UBI_IO_BITFLIPS)
bitflips = 1;
- else if (err == UBI_IO_FF)
+ else if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS)
return add_to_list(si, pnum, UBI_SCAN_UNKNOWN_EC, &si->erase);
else if (err == UBI_IO_BAD_HDR_EBADMSG || err == UBI_IO_BAD_HDR) {
/*
@@ -817,7 +817,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
else if (err == UBI_IO_BITFLIPS)
bitflips = 1;
else if (err == UBI_IO_BAD_HDR_EBADMSG || err == UBI_IO_BAD_HDR ||
- (err == UBI_IO_FF && ec_corr)) {
+ (err == UBI_IO_FF && ec_corr) || err == UBI_IO_FF_BITFLIPS) {
/* VID header is corrupted */
if (err == UBI_IO_BAD_HDR_EBADMSG ||
ec_corr == UBI_IO_BAD_HDR_EBADMSG)
@@ -86,17 +86,25 @@
* Error codes returned by the I/O sub-system.
*
* UBI_IO_FF: the read region of flash contains only 0xFFs
+ * UBI_IO_FF_BITFLIPS: the same as %UBI_IO_FF, but also also there was a data
+ * integrity error reported by the MTD driver
+ * (uncorrectable ECC error in case of NAND)
* UBI_IO_BAD_HDR: the EC or VID header is corrupted (bad magic or CRC)
* UBI_IO_BAD_HDR_EBADMSG: the same as %UBI_IO_BAD_HDR, but also there was a
* data integrity error reported by the MTD driver
* (uncorrectable ECC error in case of NAND)
* UBI_IO_BITFLIPS: bit-flips were detected and corrected
+ *
+ * Note, it is probably better to have bit-flip and ebadmsg as flags which can
+ * be or'ed with other error code. But this is a big change because there are
+ * may callers, so it does not worth the risk of introducing a bug
*/
enum {
UBI_IO_FF = 1,
+ UBI_IO_FF_BITFLIPS,
UBI_IO_BAD_HDR,
UBI_IO_BAD_HDR_EBADMSG,
- UBI_IO_BITFLIPS
+ UBI_IO_BITFLIPS,
};
/*
@@ -759,6 +759,16 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
dbg_wl("PEB %d has no VID header", e1->pnum);
protect = 1;
goto out_not_moved;
+ } else if (err == UBI_IO_FF_BITFLIPS) {
+ /*
+ * The same situation as %UBI_IO_FF, but bit-flips were
+ * detected. It is better to schedule this PEB for
+ * scrubbing.
+ */
+ dbg_wl("PEB %d has no VID header but has bit-flips",
+ e1->pnum);
+ scrubbing = 1;
+ goto out_not_moved;
}
ubi_err("error %d while reading VID header from PEB %d",