Messages in this thread | | | From | Bean Huo 霍斌斌 (beanhuo) <> | Subject | RE: [RESEND RESEND RESEND PATCH v2] mtd: nand_bbt: scan for next free bbt block if writing bbt fails | Date | Wed, 26 Aug 2015 15:57:00 +0000 |
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> + Bean, who is looking at refactoring this driver. Perhaps he can review > this. > > On Tue, Aug 25, 2015 at 12:49:26PM -0500, Xander Huff wrote: > > From: Ben Shelton <ben.shelton@ni.com> > > > > If erasing or writing the BBT fails, we should mark the current BBT > > block as bad and use the BBT descriptor to scan for the next available > > unused block in the BBT. We should only return a failure if there > > isn't any space left. > > > > Based on original code implemented by Jeff Westfahl > > <jeff.westfahl@ni.com>. > > > > Signed-off-by: Ben Shelton <ben.shelton@ni.com> > > Reviewed-by: Jaeden Amero <jaeden.amero@ni.com> > > Suggested-by: Jeff Westfahl <jeff.westfahl@ni.com> > > Signed-off-by: Xander Huff <xander.huff@ni.com> > > --- > > This v2 patch is in reply to comments from Brian Norris on 7/22/13. > > See the following links for context: > > http://lists.infradead.org/pipermail/linux-mtd/2013-July/047596.html > > http://patchwork.ozlabs.org/patch/244324/ > > Wow, a blast from the past... > > > --- > > drivers/mtd/nand/nand_base.c | 4 ++++ drivers/mtd/nand/nand_bbt.c > > | 34 ++++++++++++++++++++++++++++++++-- > > include/linux/mtd/nand.h | 7 +++++++ > > 3 files changed, 43 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/mtd/nand/nand_base.c > > b/drivers/mtd/nand/nand_base.c index ceb68ca..48299dc 100644 > > --- a/drivers/mtd/nand/nand_base.c > > +++ b/drivers/mtd/nand/nand_base.c > > @@ -2761,6 +2761,7 @@ int nand_erase_nand(struct mtd_info *mtd, struct > erase_info *instr, > > pr_debug("%s: device is write protected!\n", > > __func__); > > instr->state = MTD_ERASE_FAILED; > > + instr->priv = NAND_ERASE_WRITE_PROTECTED; > Here will overload the 'priv' field of mtdchar.c Please go thought mtdchar_ioctl() function.
> I'm pretty sure this is an illegal overloading of the 'priv' field. > Notice how ioctl(MEMERASE64) uses this field in mtdchard.c. So I suspect > you've broken char access to /dev/mtdX. Try 'flash_erase' from mtd-utils, for > instance. > > > goto erase_exit; > > } > > > > @@ -2776,6 +2777,7 @@ int nand_erase_nand(struct mtd_info *mtd, struct > erase_info *instr, > > pr_warn("%s: attempt to erase a bad block at page > 0x%08x\n", > > __func__, page); > > instr->state = MTD_ERASE_FAILED; > > + instr->priv = NAND_ERASE_BAD_BLOCK; > > goto erase_exit; > > } > > > > @@ -2802,6 +2804,7 @@ int nand_erase_nand(struct mtd_info *mtd, struct > erase_info *instr, > > pr_debug("%s: failed erase, page 0x%08x\n", > > __func__, page); > > instr->state = MTD_ERASE_FAILED; > > + instr->priv = NAND_ERASE_BLOCK_ERASE_FAILED; > > instr->fail_addr = > > ((loff_t)page << chip->page_shift); > > goto erase_exit; > > @@ -2819,6 +2822,7 @@ int nand_erase_nand(struct mtd_info *mtd, struct > erase_info *instr, > > } > > } > > instr->state = MTD_ERASE_DONE; > > + instr->priv = NAND_ERASE_OK; > > > > erase_exit: > > > > diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c > > index 63a1a36..09f9e62 100644 > > --- a/drivers/mtd/nand/nand_bbt.c > > +++ b/drivers/mtd/nand/nand_bbt.c > > @@ -662,6 +662,7 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf, > > page = td->pages[chip]; > > goto write; > > } > > +next: > > > > /* > > * Automatic placement of the bad block table. Search direction > @@ > > -787,13 +788,42 @@ static int write_bbt(struct mtd_info *mtd, uint8_t *buf, > > einfo.addr = to; > > einfo.len = 1 << this->bbt_erase_shift; > > res = nand_erase_nand(mtd, &einfo, 1); > > - if (res < 0) > > + if (res == -EIO && einfo.state == MTD_ERASE_FAILED > > + && einfo.priv == NAND_ERASE_BLOCK_ERASE_FAILED) { > > Do you actually need that last condition? What's wrong with the first two? > > > + /* This block is bad. Mark it as such and see if > > + * there's another block available in the BBT area. */ > > + int block = page >> > > + (this->bbt_erase_shift - this->page_shift); > > + pr_info("nand_bbt: failed to erase block %d when writing > BBT\n", > > + block); > > + bbt_mark_entry(this, block, BBT_BLOCK_WORN); > > + > > + res = this->block_markbad(mtd, block); > > + if (res) > > + pr_warn("nand_bbt: error %d while marking block %d > bad\n", > > + res, block); > > + goto next; > > + } else if (res < 0) > > goto outerr;
For my knowledge , we don't directly mark this block be a bad block, Just like ubi layer,this block also need to further testing and verify if It is real bad block.right?
> > > > res = scan_write_bbt(mtd, to, len, buf, > > td->options & NAND_BBT_NO_OOB ? NULL : > > &buf[len]); > > - if (res < 0) > > + if (res == -EIO) { > > + /* This block is bad. Mark it as such and see if > > + * there's another block available in the BBT area. */ > > + int block = page >> > > + (this->bbt_erase_shift - this->page_shift); > > + pr_info("nand_bbt: failed to erase block %d when writing > BBT\n", > > + block); > > + bbt_mark_entry(this, block, BBT_BLOCK_WORN); > > + > > + res = this->block_markbad(mtd, block); > > + if (res) > > + pr_warn("nand_bbt: error %d while marking block %d > bad\n", > > + res, block); > > + goto next; > > + } else if (res < 0) > > goto outerr; > > > > pr_info("Bad block table written to 0x%012llx, version 0x%02X\n", > > diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index > > 272f429..86e11f6 100644 > > --- a/include/linux/mtd/nand.h > > +++ b/include/linux/mtd/nand.h > > @@ -1030,4 +1030,11 @@ struct nand_sdr_timings { > > > > /* get timing characteristics from ONFI timing mode. */ const struct > > nand_sdr_timings *onfi_async_timing_mode_to_sdr_timings(int mode); > > + > > +/* reasons for erase failures */ > > +#define NAND_ERASE_OK 0 > > +#define NAND_ERASE_WRITE_PROTECTED 1 > > +#define NAND_ERASE_BAD_BLOCK 2 > > +#define NAND_ERASE_BLOCK_ERASE_FAILED 3 > > Why exactly do you need these statuses? I thought the existing error codes > were sufficient.. > > > + > > #endif /* __LINUX_MTD_NAND_H */ > > Brian
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