[PATCH] Make the mtdblock read/write skip the bad nand sector

From: Hans Zhang
Date: Thu Nov 21 2013 - 03:48:44 EST


When read/write the nandblock device, it will abort writing if
there's a bad block, it's reasonable to skip the bad block and
finish the data writing.
The data reading procedure should also skip the bad block since
there's no data write to the block.

Signed-off-by: Hans Zhang <zhanghonghui@xxxxxxxxxxxxx>
---
drivers/mtd/mtdblock.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
index 485ea75..66e3b23 100644
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -124,6 +124,14 @@ static int write_cached_data (struct mtdblk_dev *mtdblk)
"at 0x%lx, size 0x%x\n", mtd->name,
mtdblk->cache_offset, mtdblk->cache_size);

+retry:
+ if (mtd->block_isbad) {
+ ret = mtd->block_isbad(mtd, mtdblk->cache_offset);
+ if (ret > 0) {
+ mtdblk->cache_offset += mtdblk->cache_size;
+ goto retry;
+ }
+ }
ret = erase_write (mtd, mtdblk->cache_offset,
mtdblk->cache_size, mtdblk->cache_data);
if (ret)
@@ -163,6 +171,13 @@ static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,
size = len;

if (size == sect_size) {
+ if (mtd->block_isbad) {
+ ret = mtd->block_isbad(mtd, pos);
+ if (ret > 0) {
+ pos += sect_size;
+ continue;
+ }
+ }
/*
* We are covering a whole sector. Thus there is no
* need to bother with the cache while it may still be
@@ -242,6 +257,13 @@ static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,
mtdblk->cache_offset == sect_start) {
memcpy (buf, mtdblk->cache_data + offset, size);
} else {
+ if (mtd->block_isbad) {
+ ret = mtd->block_isbad(mtd, pos);
+ if (ret > 0) {
+ pos += sect_size;
+ continue;
+ }
+ }
ret = mtd_read(mtd, pos, size, &retlen, buf);
if (ret)
return ret;
--
1.7.1


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