[U-Boot] [PATCH 1/2] mtd/nand:Fix wrong address read in is_blank()

[Kushwaha Prabhakar-B32579]

> > IFC NAND Machine calculates ECC on 512byte sector. Same is taken care
> > in
> > fsl_ifc_run_command() while ECC status verification. Here buffer
> > number is calculated assuming 512byte sector and same is passed to
> is_blank.
> > However in is_blank() buffer address is calculated using
> > mdt->writesize which is wrong. It should be calculated on basis of ecc
> sector size.
> >
> > Also, in fsl_ifc_run_command() bufferpage is calculated on the basis
> > of ecc sector size instead of hard coded value.
> >
> > Signed-off-by: Poonam Aggrwal <poonam.aggrwal at freescale.com>
> > Signed-off-by: Prabhakar Kushwaha <prabhakar at freescale.com>
> 
> You just sent two patches based on the same commit, but those are clearly
> dependent. This is weird. So next time:
> 
> 1) Submit this with git-send-email as a series
I will take care this point in future

> 2) iomem looks linuxish, so instead of specifying u-boot commit, specify
> Linux commit/tree etc. from where this is pulled so when someone synces
> next time, he'll know where he is in linux.
This patch is independent of Linux tree. I will float similar patch to Linux tree.

> 3) Cc Scott Wood
I will take care this point in future

--Prabhakar

> > ---
> >  Based upon git://git.denx.de/u-boot.git (branch master)
> >
> >  Top commit:
> >             commit bfcc40bb09b05c90cc3b1496abb270eb8aa72134
> >             Merge: cba9a89 1895420
> >             Author: Wolfgang Denk <wd at denx.de>
> >             Date:   Fri Dec 23 20:53:58 2011 +0100
> >
> >                 Merge branch 'next' of ../next
> >
> >                 * 'next' of ../next:
> >                 mkenvimage: Add version info switch (-V)
> >                 mkenvimage: Fix getopt() error handling
> >                 mkenvimage: Fix some typos
> >                 phy: add Micrel KS8721BL phy definition
> >                 net: introduce per device index
> >                 mvgbe: remove setting of ethaddr within the driver
> >                 x86: Add support for specifying an initrd with the
> zboot
> > command x86: Refactor the zboot innards so they can be reused with a
> vboot
> > image x86: Add infrastructure to extract an e820 table from the
> coreboot
> > tables x86: Add support for booting Linux using the 32 bit boot
> protocol
> > x86: Clean up the x86 zimage code in preparation to extend it x86:
> Import
> > code from coreboot's libpayload to parse the coreboot table x86:
> Initial
> > commit for running as a coreboot payload CHECKPATCH:
> > ./board/esd/hh405/logo_320_240_8bpp.c
> >                 CHECKPATCH: ./board/esd/hh405/logo_1024_768_8bpp.c
> >                 CHECKPATCH: ./board/esd/hh405/logo_320_240_4bpp.c
> >                 CHECKPATCH: ./board/esd/hh405/logo_640_480_24bpp.c
> >                 CHECKPATCH: ./board/esd/apc405/logo_640_480_24bpp.c
> >                 CHECKPATCH: ./board/esd/voh405/logo_320_240_4bpp.c
> >                 CHECKPATCH: ./board/esd/voh405/logo_640_480_24bpp.c
> >                 CHECKPATCH: ./board/esd/hh405/fpgadata.c
> >                 CHECKPATCH: ./board/esd/pci405/fpgadata.c
> >                 CHECKPATCH: ./board/esd/tasreg/fpgadata.c
> >
> >  drivers/mtd/nand/fsl_ifc_nand.c |    6 ++++--
> >  1 files changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/mtd/nand/fsl_ifc_nand.c
> > b/drivers/mtd/nand/fsl_ifc_nand.c index b3f3c3c..3a28ab8 100644
> > --- a/drivers/mtd/nand/fsl_ifc_nand.c
> > +++ b/drivers/mtd/nand/fsl_ifc_nand.c
> > @@ -196,7 +196,9 @@ static int is_blank(struct mtd_info *mtd, struct
> > fsl_ifc_ctrl *ctrl, {
> >  	struct nand_chip *chip = mtd->priv;
> >  	struct fsl_ifc_mtd *priv = chip->priv;
> > -	u8 __iomem *addr = priv->vbase + bufnum * (mtd->writesize * 2);
> > +	int bufperpage = mtd->writesize / chip->ecc.size;
> > +	u8 __iomem *addr = priv->vbase + bufnum / bufperpage
> > +					* (mtd->writesize * 2);
> >  	u32 __iomem *main = (u32 *)addr;
> >  	u8 __iomem *oob = addr + mtd->writesize;
> >  	int i;
> > @@ -279,7 +281,7 @@ static int fsl_ifc_run_command(struct mtd_info
> *mtd)
> >  		printf("%s: Write Protect Error\n", __func__);
> >
> >  	if (ctrl->eccread) {
> > -		int bufperpage = mtd->writesize / 512;
> > +		int bufperpage = mtd->writesize / chip->ecc.size;
> >  		int bufnum = (ctrl->page & priv->bufnum_mask) * bufperpage;
> >  		int bufnum_end = bufnum + bufperpage - 1;