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UBI: print a warning if too many PEBs are corrupted 

There was a bug report recently where UBI prints:

UBI error: ubi_attach_mtd_dev: failed to attach by scanning, error -22

error messages and refuses to attach a PEB. It turned out to be a
buggy flash driver which returned garbage to almost every UBI read.
This patch makes UBI print a better message in such cases. Namely,
if UBI finds 8 or more corrupted PEBs, it prints a warning and
lists the corrupted PEBs.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2009-07-19 14:33:14 +03:00
parent 5b289b562f
commit 4a406856ea
2 changed files with 18 additions and 2 deletions
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18
drivers/mtd/ubi/scan.c
View File

@ -75,9 +75,10 @@ static int add_to_list(struct ubi_scan_info *si, int pnum, int ec,
dbg_bld("add to free: PEB %d, EC %d", pnum, ec);
else if (list == &si->erase)
dbg_bld("add to erase: PEB %d, EC %d", pnum, ec);
else if (list == &si->corr)
else if (list == &si->corr) {
dbg_bld("add to corrupted: PEB %d, EC %d", pnum, ec);
else if (list == &si->alien)
si->corr_count += 1;
} else if (list == &si->alien)
dbg_bld("add to alien: PEB %d, EC %d", pnum, ec);
else
BUG();
@ -937,6 +938,19 @@ struct ubi_scan_info *ubi_scan(struct ubi_device *ubi)
if (si->is_empty)
ubi_msg("empty MTD device detected");
/*
* Few corrupted PEBs are not a problem and may be just a result of
* unclean reboots. However, many of them may indicate some problems
* with the flash HW or driver. Print a warning in this case.
*/
if (si->corr_count >= 8 || si->corr_count >= ubi->peb_count / 4) {
ubi_warn("%d PEBs are corrupted", si->corr_count);
printk(KERN_WARNING "corrupted PEBs are:");
list_for_each_entry(seb, &si->corr, u.list)
printk(KERN_CONT " %d", seb->pnum);
printk(KERN_CONT "\n");
}
/*
* In case of unknown erase counter we use the mean erase counter
* value.

2
drivers/mtd/ubi/scan.h
View File

@ -102,6 +102,7 @@ struct ubi_scan_volume {
* @mean_ec: mean erase counter value
* @ec_sum: a temporary variable used when calculating @mean_ec
* @ec_count: a temporary variable used when calculating @mean_ec
* @corr_count: count of corrupted PEBs
* @image_seq_set: indicates @ubi->image_seq is known
*
* This data structure contains the result of scanning and may be used by other
@ -125,6 +126,7 @@ struct ubi_scan_info {
int mean_ec;
uint64_t ec_sum;
int ec_count;
int corr_count;
int image_seq_set;
};