linux-kernel - Re: [PATCH 1/2] mtd: nandsim: Embed struct nand

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Date:   Sun, 14 Apr 2019 10:44:34 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Richard Weinberger <richard@....at>
Cc:     linux-mtd@...ts.infradead.org, bbrezillon@...nel.org,
        linux-kernel@...r.kernel.org, marek.vasut@...il.com,
        miquel.raynal@...tlin.com, computersforpeace@...il.com,
        dwmw2@...radead.org
Subject: Re: [PATCH 1/2] mtd: nandsim: Embed struct nand_chip in struct
 nandsim

On Sat, 13 Apr 2019 10:40:51 +0200
Richard Weinberger <richard@....at> wrote:

> We well need struct nand_controller soon, so more stuff need to
> be parts of struct nandsim.
> While we are here, rename "nand" to "ns" to use the same naming scheme
> everywhere in nandsim.
> 
> Signed-off-by: Richard Weinberger <richard@....at>

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> ---
>  drivers/mtd/nand/raw/nandsim.c | 49 +++++++++++++++++-----------------
>  1 file changed, 24 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/nandsim.c b/drivers/mtd/nand/raw/nandsim.c
> index 933d1a629c51..3d80e2d23b6e 100644
> --- a/drivers/mtd/nand/raw/nandsim.c
> +++ b/drivers/mtd/nand/raw/nandsim.c
> @@ -298,6 +298,7 @@ union ns_mem {
>   * The structure which describes all the internal simulator data.
>   */
>  struct nandsim {
> +	struct nand_chip chip;
>  	struct mtd_partition partitions[CONFIG_NANDSIM_MAX_PARTS];
>  	unsigned int nbparts;
>  
> @@ -2216,7 +2217,7 @@ static const struct nand_controller_ops ns_controller_ops = {
>  static int __init ns_init_module(void)
>  {
>  	struct nand_chip *chip;
> -	struct nandsim *nand;
> +	struct nandsim *ns;
>  	int retval = -ENOMEM, i;
>  
>  	if (bus_width != 8 && bus_width != 16) {
> @@ -2224,16 +2225,14 @@ static int __init ns_init_module(void)
>  		return -EINVAL;
>  	}
>  
> -	/* Allocate and initialize mtd_info, nand_chip and nandsim structures */
> -	chip = kzalloc(sizeof(struct nand_chip) + sizeof(struct nandsim),
> -		       GFP_KERNEL);
> -	if (!chip) {
> +	ns = kzalloc(sizeof(struct nandsim), GFP_KERNEL);
> +	if (!ns) {
>  		NS_ERR("unable to allocate core structures.\n");
>  		return -ENOMEM;
>  	}
> +	chip	    = &ns->chip;
>  	nsmtd       = nand_to_mtd(chip);
> -	nand        = (struct nandsim *)(chip + 1);
> -	nand_set_controller_data(chip, (void *)nand);
> +	nand_set_controller_data(chip, (void *)ns);
>  
>  	/*
>  	 * Register simulator's callbacks.
> @@ -2266,19 +2265,19 @@ static int __init ns_init_module(void)
>  	 * the initial ID read command correctly
>  	 */
>  	if (id_bytes[6] != 0xFF || id_bytes[7] != 0xFF)
> -		nand->geom.idbytes = 8;
> +		ns->geom.idbytes = 8;
>  	else if (id_bytes[4] != 0xFF || id_bytes[5] != 0xFF)
> -		nand->geom.idbytes = 6;
> +		ns->geom.idbytes = 6;
>  	else if (id_bytes[2] != 0xFF || id_bytes[3] != 0xFF)
> -		nand->geom.idbytes = 4;
> +		ns->geom.idbytes = 4;
>  	else
> -		nand->geom.idbytes = 2;
> -	nand->regs.status = NS_STATUS_OK(nand);
> -	nand->nxstate = STATE_UNKNOWN;
> -	nand->options |= OPT_PAGE512; /* temporary value */
> -	memcpy(nand->ids, id_bytes, sizeof(nand->ids));
> +		ns->geom.idbytes = 2;
> +	ns->regs.status = NS_STATUS_OK(ns);
> +	ns->nxstate = STATE_UNKNOWN;
> +	ns->options |= OPT_PAGE512; /* temporary value */
> +	memcpy(ns->ids, id_bytes, sizeof(ns->ids));
>  	if (bus_width == 16) {
> -		nand->busw = 16;
> +		ns->busw = 16;
>  		chip->options |= NAND_BUSWIDTH_16;
>  	}
>  
> @@ -2323,27 +2322,27 @@ static int __init ns_init_module(void)
>  	if ((retval = nand_create_bbt(chip)) != 0)
>  		goto err_exit;
>  
> -	if ((retval = parse_badblocks(nand, nsmtd)) != 0)
> +	if ((retval = parse_badblocks(ns, nsmtd)) != 0)
>  		goto err_exit;
>  
>  	/* Register NAND partitions */
> -	retval = mtd_device_register(nsmtd, &nand->partitions[0],
> -				     nand->nbparts);
> +	retval = mtd_device_register(nsmtd, &ns->partitions[0],
> +				     ns->nbparts);
>  	if (retval != 0)
>  		goto err_exit;
>  
> -	if ((retval = nandsim_debugfs_create(nand)) != 0)
> +	if ((retval = nandsim_debugfs_create(ns)) != 0)
>  		goto err_exit;
>  
>          return 0;
>  
>  err_exit:
> -	free_nandsim(nand);
> +	free_nandsim(ns);
>  	nand_release(chip);
> -	for (i = 0;i < ARRAY_SIZE(nand->partitions); ++i)
> -		kfree(nand->partitions[i].name);
> +	for (i = 0;i < ARRAY_SIZE(ns->partitions); ++i)
> +		kfree(ns->partitions[i].name);
>  error:
> -	kfree(chip);
> +	kfree(ns);
>  	free_lists();
>  
>  	return retval;
> @@ -2364,7 +2363,7 @@ static void __exit ns_cleanup_module(void)
>  	nand_release(chip); /* Unregister driver */
>  	for (i = 0;i < ARRAY_SIZE(ns->partitions); ++i)
>  		kfree(ns->partitions[i].name);
> -	kfree(mtd_to_nand(nsmtd));        /* Free other structures */
> +	kfree(ns);        /* Free other structures */
>  	free_lists();
>  }
>