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kernel: handle bad blocks in ubi auto attach code

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The first block(s) of the ubi mtd device might be bad. We need to take
care on our own to skip the bad block(s) and read the next one(s).

Don't treat recoverable read errors as fatal and check for the UBI magic
if the data of a block could be recovered using ECC or similar.

Signed-off-by: Mathias Kresin <dev@kresin.me>
This commit is contained in:
Mathias Kresin 2018-07-08 01:47:28 +02:00
parent fdf6760cda
commit 0ac91d82ed
2 changed files with 36 additions and 8 deletions
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22
target/linux/generic/pending-4.14/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch
View file

@ -8,7 +8,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1171,6 +1171,54 @@ static struct mtd_info * __init open_mtd
@@ -1171,6 +1171,68 @@ static struct mtd_info * __init open_mtd
return mtd;
}
@ -20,6 +20,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+{
+ int err;
+ struct mtd_info *mtd;
+ loff_t offset = 0;
+ size_t len;
+ char magic[4];
+
@ -31,9 +32,22 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+ if (IS_ERR(mtd))
+ return;
+
+ /* get the first not bad block */
+ if (mtd_can_have_bb(mtd))
+ while (mtd_block_isbad(mtd, offset)) {
+ offset += mtd->erasesize;
+
+ if (offset > mtd->size) {
+ pr_err("UBI error: Failed to find a non-bad "
+ "block on mtd%d\n", mtd->index);
+ goto cleanup;
+ }
+ }
+
+ /* check for a valid ubi magic if read from flash was successful */
+ err = mtd_read(mtd, 0, 4, &len, (void *) magic);
+ if (!err && len == 4 && strncmp(magic, "UBI#", 4)) {
+ err = mtd_read(mtd, offset, 4, &len, (void *) magic);
+ if ((!err || mtd_is_bitflip(err)) &&
+ len == 4 && strncmp(magic, "UBI#", 4)) {
+ pr_err("UBI error: no valid UBI magic found inside mtd%d\n", mtd->index);
+ goto cleanup;
+ }
@ -63,7 +77,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
static int __init ubi_init(void)
{
int err, i, k;
@@ -1254,6 +1302,12 @@ static int __init ubi_init(void)
@@ -1254,6 +1316,12 @@ static int __init ubi_init(void)
}
}

22
target/linux/generic/pending-4.9/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch
View file

@ -8,7 +8,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1226,6 +1226,54 @@ static struct mtd_info * __init open_mtd
@@ -1226,6 +1226,68 @@ static struct mtd_info * __init open_mtd
return mtd;
}
@ -20,6 +20,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+{
+ int err;
+ struct mtd_info *mtd;
+ loff_t offset = 0;
+ size_t len;
+ char magic[4];
+
@ -31,9 +32,22 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+ if (IS_ERR(mtd))
+ return;
+
+ /* get the first not bad block */
+ if (mtd_can_have_bb(mtd))
+ while (mtd_block_isbad(mtd, offset)) {
+ offset += mtd->erasesize;
+
+ if (offset > mtd->size) {
+ pr_err("UBI error: Failed to find a non-bad "
+ "block on mtd%d\n", mtd->index);
+ goto cleanup;
+ }
+ }
+
+ /* check for a valid ubi magic if read from flash was successful */
+ err = mtd_read(mtd, 0, 4, &len, (void *) magic);
+ if (!err && len == 4 && strncmp(magic, "UBI#", 4)) {
+ err = mtd_read(mtd, offset, 4, &len, (void *) magic);
+ if ((!err || mtd_is_bitflip(err)) &&
+ len == 4 && strncmp(magic, "UBI#", 4)) {
+ pr_err("UBI error: no valid UBI magic found inside mtd%d\n", mtd->index);
+ goto cleanup;
+ }
@ -63,7 +77,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
static int __init ubi_init(void)
{
int err, i, k;
@@ -1309,6 +1357,12 @@ static int __init ubi_init(void)
@@ -1309,6 +1371,12 @@ static int __init ubi_init(void)
}
}