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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2009-09-30 10:01:28 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2009-10-20 10:13:04 +0300
commit2eadaad67b2b6bd132eda105128d2d466298b8e3 (patch)
tree31ca1bf2d0b2500a0600deecb81cd5af5230d0f6 /drivers/mtd
parent012abeea669ea49636cf952d13298bb68654146a (diff)
UBI: fix backward compatibility
Commit 32bc4820287a1a03982979515949e8ea56eac641 did not fully fix the backward compatibility issues. We still fail to properly handle situations when the first PEB contains non-zero image sequence number, but one of the following PEBs contains zero image sequence number. For example, this may happen if we mount a new image with an old kernel, and then try to mount it in the new kernel. This patch should fix the issue. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/ubi/scan.c7
-rw-r--r--drivers/mtd/ubi/scan.h2
2 files changed, 3 insertions, 6 deletions
diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index e7161adc419d..90af61a2c3e4 100644
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -794,16 +794,15 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
* number.
*/
image_seq = be32_to_cpu(ech->image_seq);
- if (!si->image_seq_set) {
+ if (!ubi->image_seq && image_seq)
ubi->image_seq = image_seq;
- si->image_seq_set = 1;
- } else if (ubi->image_seq && ubi->image_seq != image_seq) {
+ if (ubi->image_seq && image_seq &&
+ ubi->image_seq != image_seq) {
ubi_err("bad image sequence number %d in PEB %d, "
"expected %d", image_seq, pnum, ubi->image_seq);
ubi_dbg_dump_ec_hdr(ech);
return -EINVAL;
}
-
}
/* OK, we've done with the EC header, let's look at the VID header */
diff --git a/drivers/mtd/ubi/scan.h b/drivers/mtd/ubi/scan.h
index bab31695dace..ff179ad7ca55 100644
--- a/drivers/mtd/ubi/scan.h
+++ b/drivers/mtd/ubi/scan.h
@@ -103,7 +103,6 @@ struct ubi_scan_volume {
* @ec_sum: a temporary variable used when calculating @mean_ec
* @ec_count: a temporary variable used when calculating @mean_ec
* @corr_count: count of corrupted PEBs
- * @image_seq_set: indicates @ubi->image_seq is known
*
* This data structure contains the result of scanning and may be used by other
* UBI sub-systems to build final UBI data structures, further error-recovery
@@ -127,7 +126,6 @@ struct ubi_scan_info {
uint64_t ec_sum;
int ec_count;
int corr_count;
- int image_seq_set;
};
struct ubi_device;