Re: [PATCH v2 1/4] mtd: cfi_cmdset_0002: Use right chip in do_ppb_xxlock()

[Boris Brezillon <boris.brezillon@bootlin.com>]

On Wed,  6 Jun 2018 12:13:27 +0200
Joakim Tjernlund <joakim.tjernlund@infinera.com> wrote:

> do_ppb_xxlock() fails to add chip->start when
> quering for lock status(and chip_ready test),

  ^ querying?

> which caused false status reports.

The 3 above lines are wrapped at less than 50 chars, is this normal?

> Fix by adding adr += chip->start and adjust call sites accordingly.
> 
> Fixes: 1648eaaa1575 ("mtd: cfi_cmdset_0002: Support Persistent Protection Bits (PPB) locking")
> Cc: stable@vger.kernel.org
> Signed-off-by: Joakim Tjernlund <joakim.tjernlund@infinera.com>
> ---
> 
>  v2 - Spilt into several patches
>  
>  drivers/mtd/chips/cfi_cmdset_0002.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
> index 53a976a8e614..8648b1adccd5 100644
> --- a/drivers/mtd/chips/cfi_cmdset_0002.c
> +++ b/drivers/mtd/chips/cfi_cmdset_0002.c
> @@ -2554,8 +2554,9 @@ static int __maybe_unused do_ppb_xxlock(struct map_info *map,
>  	unsigned long timeo;
>  	int ret;
>  
> +	adr += chip->start;
>  	mutex_lock(&chip->mutex);
> -	ret = get_chip(map, chip, adr + chip->start, FL_LOCKING);
> +	ret = get_chip(map, chip, adr, FL_LOCKING);
>  	if (ret) {
>  		mutex_unlock(&chip->mutex);
>  		return ret;
> @@ -2573,8 +2574,8 @@ static int __maybe_unused do_ppb_xxlock(struct map_info *map,
>  
>  	if (thunk == DO_XXLOCK_ONEBLOCK_LOCK) {
>  		chip->state = FL_LOCKING;
> -		map_write(map, CMD(0xA0), chip->start + adr);
> -		map_write(map, CMD(0x00), chip->start + adr);
> +		map_write(map, CMD(0xA0), adr);
> +		map_write(map, CMD(0x00), adr);
>  	} else if (thunk == DO_XXLOCK_ONEBLOCK_UNLOCK) {
>  		/*
>  		 * Unlocking of one specific sector is not supported, so we
> @@ -2612,7 +2613,7 @@ static int __maybe_unused do_ppb_xxlock(struct map_info *map,
>  	map_write(map, CMD(0x00), chip->start);
>  
>  	chip->state = FL_READY;
> -	put_chip(map, chip, adr + chip->start);
> +	put_chip(map, chip, adr);
>  	mutex_unlock(&chip->mutex);
>  
>  	return ret;