[U-Boot] [PATCH] mtd: mxc_nand: Fix crash after MTD resync

[Scott Wood <scottwood@freescale.com>]

On 07/02/2013 03:57:58 PM, Marek Vasut wrote:
> Dear Scott Wood,
> 
> > On 07/02/2013 10:11:55 AM, Marek Vasut wrote:
> > > The driver triggered a BUG() in nand_base.c:3214/nand_scan_tail()
> > > because the ecc.strength was incorrectly set in case of  
> NAND_ECC_HW
> > > instead of NAND_ECC_HW_SYNDROME ECC mode.
> > >
> > > Signed-off-by: Marek Vasut <marex@denx.de>
> > > Cc: Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
> > > Cc: Fabio Estevam <fabio.estevam@freescale.com>
> > > Cc: Scott Wood <scottwood@freescale.com>
> > > ---
> > >
> > >  drivers/mtd/nand/mxc_nand.c |    7 ++-----
> > >  1 file changed, 2 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/drivers/mtd/nand/mxc_nand.c  
> b/drivers/mtd/nand/mxc_nand.c
> > > index ac435f2..08c7b8b 100644
> > > --- a/drivers/mtd/nand/mxc_nand.c
> > > +++ b/drivers/mtd/nand/mxc_nand.c
> > > @@ -1238,15 +1238,12 @@ int board_nand_init(struct nand_chip  
> *this)
> > >
> > >  		this->ecc.write_oob = mxc_nand_write_oob_syndrome;
> > >  		this->ecc.bytes = 9;
> > >  		this->ecc.prepad = 7;
> > >
> > > -	} else {
> > > -		this->ecc.mode = NAND_ECC_HW;
> > > -	}
> > > -
> > > -	if (this->ecc.mode == NAND_ECC_HW) {
> > >
> > >  		if (is_mxc_nfc_1())
> > >  		
> > >  			this->ecc.strength = 1;
> > >  		
> > >  		else
> > >  		
> > >  			this->ecc.strength = 4;
> > >
> > > +	} else {
> > > +		this->ecc.mode = NAND_ECC_HW;
> > >
> > >  	}
> >
> > Where does ecc.strength now get set for the non-SYNDROME case?
> 
> Gone ;-) The strength only needs to be set for the SYNDROME case  
> according to
> the code in nand_base.c .

Read it again.  Note the lack of a "break;" before "case  
NAND_ECC_HW_SYNDROME:".

-Scott