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Diffstat (limited to 'drivers/mtd/ubi/io.c')
-rw-r--r--drivers/mtd/ubi/io.c54
1 files changed, 22 insertions, 32 deletions
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index f9f9738e5..e55dfc5bc 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -473,10 +473,12 @@ out:
*/
static int nor_erase_prepare(struct ubi_device *ubi, int pnum)
{
- int err, err1;
+ int err;
size_t written;
loff_t addr;
uint32_t data = 0;
+ struct ubi_ec_hdr ec_hdr;
+
/*
* Note, we cannot generally define VID header buffers on stack,
* because of the way we deal with these buffers (see the header
@@ -487,50 +489,38 @@ static int nor_erase_prepare(struct ubi_device *ubi, int pnum)
struct ubi_vid_hdr vid_hdr;
/*
+ * If VID or EC is valid, we have to corrupt them before erasing.
* It is important to first invalidate the EC header, and then the VID
* header. Otherwise a power cut may lead to valid EC header and
* invalid VID header, in which case UBI will treat this PEB as
* corrupted and will try to preserve it, and print scary warnings.
*/
addr = (loff_t)pnum * ubi->peb_size;
- err = mtd_write(ubi->mtd, addr, 4, &written, (void *)&data);
- if (!err) {
- addr += ubi->vid_hdr_aloffset;
+ err = ubi_io_read_ec_hdr(ubi, pnum, &ec_hdr, 0);
+ if (err != UBI_IO_BAD_HDR_EBADMSG && err != UBI_IO_BAD_HDR &&
+ err != UBI_IO_FF){
err = mtd_write(ubi->mtd, addr, 4, &written, (void *)&data);
- if (!err)
- return 0;
+ if(err)
+ goto error;
}
- /*
- * We failed to write to the media. This was observed with Spansion
- * S29GL512N NOR flash. Most probably the previously eraseblock erasure
- * was interrupted at a very inappropriate moment, so it became
- * unwritable. In this case we probably anyway have garbage in this
- * PEB.
- */
- err1 = ubi_io_read_vid_hdr(ubi, pnum, &vid_hdr, 0);
- if (err1 == UBI_IO_BAD_HDR_EBADMSG || err1 == UBI_IO_BAD_HDR ||
- err1 == UBI_IO_FF) {
- struct ubi_ec_hdr ec_hdr;
-
- err1 = ubi_io_read_ec_hdr(ubi, pnum, &ec_hdr, 0);
- 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
- * safely erase this PEB and not afraid that it will be
- * treated as a valid PEB in case of an unclean reboot.
- */
- return 0;
+ err = ubi_io_read_vid_hdr(ubi, pnum, &vid_hdr, 0);
+ if (err != UBI_IO_BAD_HDR_EBADMSG && err != UBI_IO_BAD_HDR &&
+ err != UBI_IO_FF){
+ addr += ubi->vid_hdr_aloffset;
+ err = mtd_write(ubi->mtd, addr, 4, &written, (void *)&data);
+ if (err)
+ goto error;
}
+ return 0;
+error:
/*
- * The PEB contains a valid VID header, but we cannot invalidate it.
- * Supposedly the flash media or the driver is screwed up, so return an
- * error.
+ * The PEB contains a valid VID or EC header, but we cannot invalidate
+ * it. Supposedly the flash media or the driver is screwed up, so
+ * return an error.
*/
- ubi_err("cannot invalidate PEB %d, write returned %d read returned %d",
- pnum, err, err1);
+ ubi_err("cannot invalidate PEB %d, write returned %d", pnum, err);
ubi_dump_flash(ubi, pnum, 0, ubi->peb_size);
return -EIO;
}