提交 88063dd6 编写于 作者: L Linus Torvalds

Merge branch 'linux-next' of git://git.infradead.org/ubi-2.6

* 'linux-next' of git://git.infradead.org/ubi-2.6:
  UBI: fix corrupted PEB detection for NOR flash
......@@ -482,10 +482,17 @@ static int nor_erase_prepare(struct ubi_device *ubi, int pnum)
uint32_t data = 0;
struct ubi_vid_hdr vid_hdr;
addr = (loff_t)pnum * ubi->peb_size + ubi->vid_hdr_aloffset;
/*
* 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 (see
* the header comment in scan.c for more information).
*/
addr = (loff_t)pnum * ubi->peb_size;
err = ubi->mtd->write(ubi->mtd, addr, 4, &written, (void *)&data);
if (!err) {
addr -= ubi->vid_hdr_aloffset;
addr += ubi->vid_hdr_aloffset;
err = ubi->mtd->write(ubi->mtd, addr, 4, &written,
(void *)&data);
if (!err)
......@@ -494,18 +501,24 @@ static int nor_erase_prepare(struct ubi_device *ubi, int pnum)
/*
* We failed to write to the media. This was observed with Spansion
* S29GL512N NOR flash. Most probably the eraseblock erasure was
* interrupted at a very inappropriate moment, so it became unwritable.
* In this case we probably anyway have garbage in this PEB.
* 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)
/*
* The VID header is 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;
if (err1 == UBI_IO_BAD_HDR_EBADMSG || err1 == UBI_IO_BAD_HDR) {
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)
/*
* 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;
}
/*
* The PEB contains a valid VID header, but we cannot invalidate it.
......
......@@ -953,6 +953,10 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
* impossible to distinguish it from a PEB which just
* contains garbage because of a power cut during erase
* operation. So we just schedule this PEB for erasure.
*
* Besides, in case of NOR flash, we deliberatly
* corrupt both headers because NOR flash erasure is
* slow and can start from the end.
*/
err = 0;
else
......
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