OpenWrt – Rev 1
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Sat, 2 Jan 2016 01:04:52 +0100
Subject: [PATCH] mtd: bcm47xxpart: check for bad blocks when calculating
offsets
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
---
drivers/mtd/bcm47xxpart.c | 50 +++++++++++++++++++++++++++++++++++++----------
1 file changed, 40 insertions(+), 10 deletions(-)
--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -61,6 +61,34 @@ static void bcm47xxpart_add_part(struct
part->mask_flags = mask_flags;
}
+/*
+ * Calculate real end offset (address) for a given amount of data. It checks
+ * all blocks skipping bad ones.
+ */
+static size_t bcm47xxpart_real_offset(struct mtd_info *master, size_t offset,
+ size_t bytes)
+{
+ size_t real_offset = offset;
+
+ if (mtd_block_isbad(master, real_offset))
+ pr_warn("Base offset shouldn't be at bad block");
+
+ while (bytes >= master->erasesize) {
+ bytes -= master->erasesize;
+ real_offset += master->erasesize;
+ while (mtd_block_isbad(master, real_offset)) {
+ real_offset += master->erasesize;
+
+ if (real_offset >= master->size)
+ return real_offset - master->erasesize;
+ }
+ }
+
+ real_offset += bytes;
+
+ return real_offset;
+}
+
static const char *bcm47xxpart_trx_data_part_name(struct mtd_info *master,
size_t offset)
{
@@ -182,6 +210,8 @@ static int bcm47xxpart_parse(struct mtd_
/* TRX */
if (buf[0x000 / 4] == TRX_MAGIC) {
+ uint32_t tmp;
+
if (BCM47XXPART_MAX_PARTS - curr_part < 4) {
pr_warn("Not enough partitions left to register trx, scanning stopped!\n");
break;
@@ -196,18 +226,18 @@ static int bcm47xxpart_parse(struct mtd_
i = 0;
/* We have LZMA loader if offset[2] points to sth */
if (trx->offset[2]) {
+ tmp = bcm47xxpart_real_offset(master, offset,
+ trx->offset[i]);
bcm47xxpart_add_part(&parts[curr_part++],
- "loader",
- offset + trx->offset[i],
- 0);
+ "loader", tmp, 0);
i++;
}
if (trx->offset[i]) {
+ tmp = bcm47xxpart_real_offset(master, offset,
+ trx->offset[i]);
bcm47xxpart_add_part(&parts[curr_part++],
- "linux",
- offset + trx->offset[i],
- 0);
+ "linux", tmp, 0);
i++;
}
@@ -219,11 +249,11 @@ static int bcm47xxpart_parse(struct mtd_
if (trx->offset[i]) {
const char *name;
- name = bcm47xxpart_trx_data_part_name(master, offset + trx->offset[i]);
+ tmp = bcm47xxpart_real_offset(master, offset,
+ trx->offset[i]);
+ name = bcm47xxpart_trx_data_part_name(master, tmp);
bcm47xxpart_add_part(&parts[curr_part++],
- name,
- offset + trx->offset[i],
- 0);
+ name, tmp, 0);
i++;
}