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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2009-07-19 14:33:14 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2009-08-14 20:01:36 +0300
commit4a406856ea6830d8b8dba6a27d9f9331c5f4c13a (patch)
tree9bca90ac072a68eb762f985d62c512c55ba6dadc /drivers/mtd
parent5b289b562f6d236108569a880cb38cc03d17a50d (diff)
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>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/ubi/scan.c18
-rw-r--r--drivers/mtd/ubi/scan.h2
2 files changed, 18 insertions, 2 deletions
diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index 93361eadab8..e7161adc419 100644
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -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();
@@ -938,6 +939,19 @@ struct ubi_scan_info *ubi_scan(struct ubi_device *ubi)
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.
*/
diff --git a/drivers/mtd/ubi/scan.h b/drivers/mtd/ubi/scan.h
index 1017cf12def..bab31695dac 100644
--- a/drivers/mtd/ubi/scan.h
+++ b/drivers/mtd/ubi/scan.h
@@ -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;
};