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UBI: fix NOR erase preparation quirk

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In 'nor_erase_prepare()' we want to make sure the UBI headers are
corrupted. But it is possible that one of the headers just contains
all 0xFFs, which is also OK, because UBI will erase it in case of
a power cut.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Holger Brunck 2011-01-25 13:04:11 +02:00 committed by Artem Bityutskiy
parent 3c0eee3fe6
commit d4c6381303
1 changed files with 4 additions and 2 deletions
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6
drivers/mtd/ubi/io.c
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@ -507,11 +507,13 @@ static int nor_erase_prepare(struct ubi_device *ubi, int pnum)
* PEB. * PEB.
*/ */
err1 = ubi_io_read_vid_hdr(ubi, pnum, &vid_hdr, 0); err1 = ubi_io_read_vid_hdr(ubi, pnum, &vid_hdr, 0);
if (err1 == UBI_IO_BAD_HDR_EBADMSG || err1 == UBI_IO_BAD_HDR) { if (err1 == UBI_IO_BAD_HDR_EBADMSG || err1 == UBI_IO_BAD_HDR ||
err1 == UBI_IO_FF) {
struct ubi_ec_hdr ec_hdr; struct ubi_ec_hdr ec_hdr;
err1 = ubi_io_read_ec_hdr(ubi, pnum, &ec_hdr, 0); err1 = ubi_io_read_ec_hdr(ubi, pnum, &ec_hdr, 0);
if (err1 == UBI_IO_BAD_HDR_EBADMSG || err1 == UBI_IO_BAD_HDR) if (err1 == UBI_IO_BAD_HDR_EBADMSG || err1 == UBI_IO_BAD_HDR ||
err1 == UBI_IO_FF)
/* /*
* Both VID and EC headers are corrupted, so we can * Both VID and EC headers are corrupted, so we can
* safely erase this PEB and not afraid that it will be * safely erase this PEB and not afraid that it will be