From 7bede46e587da51765a9d0a435f8cc14d3082d7c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Sat, 2 Jan 2016 00:33:48 +0000
Subject: kernel: make bcm47xxpart work with TRX flashed at bad block(s)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
SVN-Revision: 48061
---
...part-check-for-bad-blocks-when-calculatin.patch | 100 +++++++++++++++++++++
1 file changed, 100 insertions(+)
create mode 100644 target/linux/generic/patches-3.18/431-mtd-bcm47xxpart-check-for-bad-blocks-when-calculatin.patch
(limited to 'target/linux/generic/patches-3.18/431-mtd-bcm47xxpart-check-for-bad-blocks-when-calculatin.patch')
diff --git a/target/linux/generic/patches-3.18/431-mtd-bcm47xxpart-check-for-bad-blocks-when-calculatin.patch b/target/linux/generic/patches-3.18/431-mtd-bcm47xxpart-check-for-bad-blocks-when-calculatin.patch
new file mode 100644
index 0000000000..6adac77669
--- /dev/null
+++ b/target/linux/generic/patches-3.18/431-mtd-bcm47xxpart-check-for-bad-blocks-when-calculatin.patch
@@ -0,0 +1,100 @@
+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
+@@ -61,6 +61,34 @@ static void bcm47xxpart_add_part(struct mtd_partition *part, const char *name,
+ 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_info *master,
+
+ /* 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_info *master,
+ 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_info *master,
+ 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++;
+ }
+
--
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