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

[Hans Zhang]

 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 at innofidei.com>
---
 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


¡°This E-mail and its attachments may contain legally privileged or confidential information from Innofidei Corporation. Any unauthorized copy, use, disclosure or distribution of this information is strictly prohibited. If you are not the intended recipient, please notify the sender immediately by E-mail or telephone and delete this E-mail and all its attachments immediately.
±¾Óʼþ¼°Æ丽¼þÄÚÈÝ¿ÉÄÜ°üº¬´´Ò㹫˾ÏíÓÐרÓз¨ÂÉȨÀûµÄ»òÕßÐèÒª±£ÃܵÄÐÅÏ¢¡£ÑϽûÈκÎÈËδ¾­·¢¼þÈËÐí¿ÉÒÔÈκÎÐÎʽ¸´ÖÆ¡¢Ê¹Óá¢Åû¶»òÕßÉ¢·¢´ËÏîÐÅÏ¢¡£Èç¹ûÄú²»ÊǸÃÊÕ¼þÈË£¬ÇëÄúÁ¢¼´Í¨¹ýÓʼþ»òÕߵ绰֪ͨ·¢¼þÈ˲¢Á¢¼´É¾³ý±¾Óʼþ¼°Æ丽¼þÄÚÈÝ.¡±