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| author | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2010-09-03 14:22:17 +0300 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2010-10-19 17:19:56 +0300 |
| commit | 92e1a7d9e7e07fb1cf0cbbcdf202938d0819b54d (patch) | |
| tree | 48930121fa2f1cf9ebd36f85118fe433d1ecd01f /drivers/mtd/ubi/wl.c | |
| parent | 74d82d2660058e32644f0c673656b2a1d01d3688 (diff) | |
| download | op-kernel-dev-92e1a7d9e7e07fb1cf0cbbcdf202938d0819b54d.zip op-kernel-dev-92e1a7d9e7e07fb1cf0cbbcdf202938d0819b54d.tar.gz | |
UBI: handle bit-flips when no header found
Currently UBI has one small flaw - when we read EC or VID header, but find only
0xFF bytes, we return UBI_IO_FF and do not report whether we had bit-flips or
not. In case of the VID header, the scanning code adds this PEB to the free list,
even though there were bit-flips.
Imagine the following situation: we start writing VID header to a PEB and have a
power cut, so the PEB becomes unstable. When we scan and read the PEB, we get
a bit-flip. Currently, UBI would just ignore this and treat the PEB as free. This
patch changes UBI behavior and now UBI will schedule this PEB for erasure.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers/mtd/ubi/wl.c')
| -rw-r--r-- | drivers/mtd/ubi/wl.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c index a9e7c9e..605ecb1 100644 --- a/drivers/mtd/ubi/wl.c +++ b/drivers/mtd/ubi/wl.c @@ -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", |
