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UBI: fix error handling in erase worker

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Do not switch to read-only mode in case of -EINTR and some
other obvious cases. Switch to RO mode only when we do not
know what is the error.

Reported-by: Vinit Agnihotri <vinit.agnihotri@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2007-07-18 13:42:10 +03:00
parent 63b6c1ed56
commit 784c145444
1 changed files with 52 additions and 45 deletions
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97
drivers/mtd/ubi/wl.c
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@ -1060,9 +1060,8 @@ static int ensure_wear_leveling(struct ubi_device *ubi)
static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
int cancel)
{
int err;
struct ubi_wl_entry *e = wl_wrk->e;
int pnum = e->pnum;
int pnum = e->pnum, err, need;
if (cancel) {
dbg_wl("cancel erasure of PEB %d EC %d", pnum, e->ec);
@ -1097,62 +1096,70 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
kfree(wl_wrk);
kmem_cache_free(wl_entries_slab, e);
if (err != -EIO) {
if (err == -EINTR || err == -ENOMEM || err == -EAGAIN ||
err == -EBUSY) {
int err1;
/* Re-schedule the LEB for erasure */
err1 = schedule_erase(ubi, e, 0);
if (err1) {
err = err1;
goto out_ro;
}
return err;
} else if (err != -EIO) {
/*
* If this is not %-EIO, we have no idea what to do. Scheduling
* this physical eraseblock for erasure again would cause
* errors again and again. Well, lets switch to RO mode.
*/
ubi_ro_mode(ubi);
return err;
goto out_ro;
}
/* It is %-EIO, the PEB went bad */
if (!ubi->bad_allowed) {
ubi_err("bad physical eraseblock %d detected", pnum);
ubi_ro_mode(ubi);
err = -EIO;
} else {
int need;
spin_lock(&ubi->volumes_lock);
need = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs + 1;
if (need > 0) {
need = ubi->avail_pebs >= need ? need : ubi->avail_pebs;
ubi->avail_pebs -= need;
ubi->rsvd_pebs += need;
ubi->beb_rsvd_pebs += need;
if (need > 0)
ubi_msg("reserve more %d PEBs", need);
}
if (ubi->beb_rsvd_pebs == 0) {
spin_unlock(&ubi->volumes_lock);
ubi_err("no reserved physical eraseblocks");
ubi_ro_mode(ubi);
return -EIO;
}
spin_unlock(&ubi->volumes_lock);
ubi_msg("mark PEB %d as bad", pnum);
err = ubi_io_mark_bad(ubi, pnum);
if (err) {
ubi_ro_mode(ubi);
return err;
}
spin_lock(&ubi->volumes_lock);
ubi->beb_rsvd_pebs -= 1;
ubi->bad_peb_count += 1;
ubi->good_peb_count -= 1;
ubi_calculate_reserved(ubi);
if (ubi->beb_rsvd_pebs == 0)
ubi_warn("last PEB from the reserved pool was used");
spin_unlock(&ubi->volumes_lock);
goto out_ro;
}
spin_lock(&ubi->volumes_lock);
need = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs + 1;
if (need > 0) {
need = ubi->avail_pebs >= need ? need : ubi->avail_pebs;
ubi->avail_pebs -= need;
ubi->rsvd_pebs += need;
ubi->beb_rsvd_pebs += need;
if (need > 0)
ubi_msg("reserve more %d PEBs", need);
}
if (ubi->beb_rsvd_pebs == 0) {
spin_unlock(&ubi->volumes_lock);
ubi_err("no reserved physical eraseblocks");
goto out_ro;
}
spin_unlock(&ubi->volumes_lock);
ubi_msg("mark PEB %d as bad", pnum);
err = ubi_io_mark_bad(ubi, pnum);
if (err)
goto out_ro;
spin_lock(&ubi->volumes_lock);
ubi->beb_rsvd_pebs -= 1;
ubi->bad_peb_count += 1;
ubi->good_peb_count -= 1;
ubi_calculate_reserved(ubi);
if (ubi->beb_rsvd_pebs == 0)
ubi_warn("last PEB from the reserved pool was used");
spin_unlock(&ubi->volumes_lock);
return err;
out_ro:
ubi_ro_mode(ubi);
return err;
}