tree 48930121fa2f1cf9ebd36f85118fe433d1ecd01f
parent 74d82d2660058e32644f0c673656b2a1d01d3688
author Artem Bityutskiy <Artem.Bityutskiy@nokia.com> 1283512937 +0300
committer Artem Bityutskiy <Artem.Bityutskiy@nokia.com> 1287497996 +0300

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>