ubi corrupted list not counted as bad block

Balachandra KUMAR balachandra.kumar.ext at valeo.com
Wed Nov 13 00:04:43 PST 2019


Hi MTD Experts,

 I am hitting the below problem :
UBI assert failed in ubi_wl_init at line 1632
-> ubi_assert(ubi->good_peb_count == found_pebs);

The issue is because, in the scan_peb( ) , a specific PEB is found to
be corrupted in the volume header CRC calculation which is a
UBI_IO_BAD_HDR error.

Later in scan_peb ( ), my target hits the else part saying its an
unexpected corruption.
[attach.c]
else if (!err)
                        /* This corruption is caused by a power cut */
                        err = add_to_list(ai, pnum, UBI_UNKNOWN,
                                          UBI_UNKNOWN, ec, 1, &ai->erase);
                else {
                        /* This is an unexpected corruption */
                       err = add_corrupted(ai, pnum, ec);
                 }

The count of good peb is done as below :
/* code snippet in attach.c */
   ubi->bad_peb_count = ai->bad_peb_count; (this is 0 in my case)
   ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count;
(total_peb_count(3464) - 0 = 3464) but what about the corrupted one?
   ubi->corr_peb_count = ai->corr_peb_count;   (this is 1)

Why is
good_peb_count = peb_count - bad_peb_count ? (why not minus
corrupt_peb_count or add it to erase list?)

in the ubi_wl_init ( ) , the found_pebs is calculated from erase list
and free list and we skip the corrupted peb list. But the good_count
cotains the corrupted count as well.
So , i hit this problem ->
  ubi_assert(ubi->good_peb_count == found_pebs);

What is the logic behind this good_peb_count?

Thanks
bala

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