On Tue, Sep 28, 2021 at 03:07:20PM +0100, Lad Prabhakar wrote:
> RPCIF_DIRMAP_SIZE may differ on various SoC's. Instead of using
> RPCIF_DIRMAP_SIZE macro use resource size to get dirmap size
> which is already part of struct rpcif.
> 
> Also make sure we return error in case devm_ioremap_resource()
> fails for dirmap.
> 
> Fixes: ca7d8b980b67 ("memory: add Renesas RPC-IF driver")
> Fixes: 59e27d7c94aa ("memory: renesas-rpc-if: fix possible NULL pointer dereference of resource")
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>

In general, all fine. I just think this should be split into two
patches:

> @@ -147,8 +147,6 @@
>  #define RPCIF_PHYINT		0x0088	/* R/W */
>  #define RPCIF_PHYINT_WPVAL	BIT(1)
>  
> -#define RPCIF_DIRMAP_SIZE	0x4000000
> -
>  static const struct regmap_range rpcif_volatile_ranges[] = {
>  	regmap_reg_range(RPCIF_SMRDR0, RPCIF_SMRDR1),
>  	regmap_reg_range(RPCIF_SMWDR0, RPCIF_SMWDR1),
> @@ -547,8 +545,8 @@ EXPORT_SYMBOL(rpcif_manual_xfer);
>  
>  ssize_t rpcif_dirmap_read(struct rpcif *rpc, u64 offs, size_t len, void *buf)
>  {
> -	loff_t from = offs & (RPCIF_DIRMAP_SIZE - 1);
> -	size_t size = RPCIF_DIRMAP_SIZE - from;
> +	loff_t from = offs & (rpc->size - 1);
> +	size_t size = rpc->size - from;
>  
>  	if (len > size)
>  		len = size;

This is the second patch to split which fixes ca7d8b980b67.


> @@ -244,7 +242,7 @@ int rpcif_sw_init(struct rpcif *rpc, struct device *dev)
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dirmap");
>  	rpc->dirmap = devm_ioremap_resource(&pdev->dev, res);
>  	if (IS_ERR(rpc->dirmap))
> -		rpc->dirmap = NULL;
> +		return PTR_ERR(rpc->dirmap);
>  	rpc->size = resource_size(res);
>  
>  	rpc->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);

This is the first patch to split which fixes 59e27d7c94aa.

Makes sense?

If you agree, you can add my tag already to the new patches:

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>