mirror of https://github.com/hak5/openwrt.git
92 lines
2.6 KiB
Diff
92 lines
2.6 KiB
Diff
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
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Date: Sat, 2 Jan 2016 01:04:52 +0100
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Subject: [PATCH] mtd: bcm47xxpart: check for bad blocks when calculating
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offsets
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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---
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drivers/mtd/bcm47xxpart.c | 50 +++++++++++++++++++++++++++++++++++++----------
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1 file changed, 40 insertions(+), 10 deletions(-)
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--- a/drivers/mtd/bcm47xxpart.c
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+++ b/drivers/mtd/bcm47xxpart.c
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@@ -62,6 +62,34 @@ static void bcm47xxpart_add_part(struct
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part->mask_flags = mask_flags;
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}
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+/*
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+ * Calculate real end offset (address) for a given amount of data. It checks
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+ * all blocks skipping bad ones.
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+ */
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+static size_t bcm47xxpart_real_offset(struct mtd_info *master, size_t offset,
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+ size_t bytes)
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+{
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+ size_t real_offset = offset;
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+
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+ if (mtd_block_isbad(master, real_offset))
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+ pr_warn("Base offset shouldn't be at bad block");
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+
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+ while (bytes >= master->erasesize) {
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+ bytes -= master->erasesize;
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+ real_offset += master->erasesize;
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+ while (mtd_block_isbad(master, real_offset)) {
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+ real_offset += master->erasesize;
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+
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+ if (real_offset >= master->size)
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+ return real_offset - master->erasesize;
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+ }
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+ }
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+
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+ real_offset += bytes;
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+
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+ return real_offset;
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+}
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+
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static const char *bcm47xxpart_trx_data_part_name(struct mtd_info *master,
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size_t offset)
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{
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@@ -91,6 +119,7 @@ static int bcm47xxpart_parse_trx(struct
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{
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struct trx_header header;
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size_t bytes_read;
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+ size_t offset;
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int curr_part = 0;
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int i, err;
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@@ -110,21 +139,25 @@ static int bcm47xxpart_parse_trx(struct
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/* We have LZMA loader if offset[2] points to sth */
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if (header.offset[2]) {
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- bcm47xxpart_add_part(&parts[curr_part++], "loader",
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- trx->offset + header.offset[i], 0);
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+ offset = bcm47xxpart_real_offset(master, trx->offset,
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+ header.offset[i]);
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+ bcm47xxpart_add_part(&parts[curr_part++], "loader", offset, 0);
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i++;
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}
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if (header.offset[i]) {
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- bcm47xxpart_add_part(&parts[curr_part++], "linux",
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- trx->offset + header.offset[i], 0);
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+ offset = bcm47xxpart_real_offset(master, trx->offset,
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+ header.offset[i]);
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+ bcm47xxpart_add_part(&parts[curr_part++], "linux", offset, 0);
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i++;
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}
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if (header.offset[i]) {
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- size_t offset = trx->offset + header.offset[i];
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- const char *name = bcm47xxpart_trx_data_part_name(master,
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- offset);
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+ const char *name;
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+
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+ offset = bcm47xxpart_real_offset(master, trx->offset,
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+ header.offset[i]);
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+ name = bcm47xxpart_trx_data_part_name(master, offset);
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bcm47xxpart_add_part(&parts[curr_part++], name, offset, 0);
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i++;
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