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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
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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
@@ -62,6 +62,34 @@ 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)
{
@@ -91,6 +119,7 @@ static int bcm47xxpart_parse_trx(struct
{
struct trx_header header;
size_t bytes_read;
+ size_t offset;
int curr_part = 0;
int i, err;
@@ -110,21 +139,25 @@ static int bcm47xxpart_parse_trx(struct
/* We have LZMA loader if offset[2] points to sth */
if (header.offset[2]) {
- bcm47xxpart_add_part(&parts[curr_part++], "loader",
- trx->offset + header.offset[i], 0);
+ offset = bcm47xxpart_real_offset(master, trx->offset,
+ header.offset[i]);
+ bcm47xxpart_add_part(&parts[curr_part++], "loader", offset, 0);
i++;
}
if (header.offset[i]) {
- bcm47xxpart_add_part(&parts[curr_part++], "linux",
- trx->offset + header.offset[i], 0);
+ offset = bcm47xxpart_real_offset(master, trx->offset,
+ header.offset[i]);
+ bcm47xxpart_add_part(&parts[curr_part++], "linux", offset, 0);
i++;
}
if (header.offset[i]) {
- size_t offset = trx->offset + header.offset[i];
- const char *name = bcm47xxpart_trx_data_part_name(master,
- offset);
+ const char *name;
+
+ offset = bcm47xxpart_real_offset(master, trx->offset,
+ header.offset[i]);
+ name = bcm47xxpart_trx_data_part_name(master, offset);
bcm47xxpart_add_part(&parts[curr_part++], name, offset, 0);
i++;
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