From 13f0fd94e3cae6f8a0d9fba5d367e311edc8ebde Mon Sep 17 00:00:00 2001 From: Ilya Yanok Date: Mon, 30 Jun 2008 15:34:40 +0200 Subject: [PATCH] NAND: Scan bad blocks lazily. Rather than scanning on boot, scan upon the first attempt to check the badness of a block. This speeds up boot when not using NAND, and reduces the likelihood of needing to reflash via JTAG if NAND becomes nonfunctional. Signed-off-by: Ilya Yanok Signed-off-by: Scott Wood --- drivers/mtd/nand/nand_base.c | 10 +++++++--- include/linux/mtd/nand.h | 2 ++ 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 7bceea8ac3..cf2f374554 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -457,6 +457,11 @@ static int nand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, { struct nand_chip *chip = mtd->priv; + if (!(chip->options & NAND_BBT_SCANNED)) { + chip->scan_bbt(mtd); + chip->options |= NAND_BBT_SCANNED; + } + if (!chip->bbt) return chip->block_bad(mtd, ofs, getchip); @@ -2721,10 +2726,9 @@ int nand_scan_tail(struct mtd_info *mtd) /* Check, if we should skip the bad block table scan */ if (chip->options & NAND_SKIP_BBTSCAN) - return 0; + chip->options |= NAND_BBT_SCANNED; - /* Build bad block table */ - return chip->scan_bbt(mtd); + return 0; } /* module_text_address() isn't exported, and it's mostly a pointless diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index f9b7d36a73..2993a89e1b 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -204,6 +204,8 @@ typedef enum { (e.g. because it needs them DMA-coherent */ #define NAND_OWN_BUFFERS 0x00040000 /* Options set by nand scan */ +/* bbt has already been read */ +#define NAND_BBT_SCANNED 0x40000000 /* Nand scan has allocated controller struct */ #define NAND_CONTROLLER_ALLOC 0x80000000 -- 2.30.2