Re: [PATCH 1/2] mtd: nand: BUG_ON in case of no select_chip and cmd_ctrl

[Richard Weinberger <richard@nod.at>]

Am 19.07.2016 um 17:41 schrieb Andrey Smirnov:
> If no user specified chip->select_chip() function is provided, code in
> nand_base.c will automatically set this hook to nand_select_chip(),
> which in turn depends on chip->cmd_ctrl() hook being valid. Not
> providing both of those functions in NAND controller driver (for example
> by mistake) will result in a bit cryptic segfault. Replace it with
> explicit BUG_ON statement so it would be obvious what went wrong.
> 
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
> ---
>  drivers/mtd/nand/nand_base.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index ce7b2ca..57043a6 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -3128,8 +3128,10 @@ static void nand_set_defaults(struct nand_chip *chip, int busw)
>  	if (chip->waitfunc == NULL)
>  		chip->waitfunc = nand_wait;
>  
> -	if (!chip->select_chip)
> +	if (!chip->select_chip) {
> +		BUG_ON(!chip->cmd_ctrl);

Please don't add new BUG_ON() calls. WARN_ON() is good enough to raise the driver developer's
attention and won't kill the machine.

Thanks,
//richard