Re: [PATCH 01/18] mtd: rawnand: sunxi: Use devm_platform_get_and_ioremap_resource()

[Miquel Raynal]

Hi Yangtao,

frank.li@xxxxxxxx wrote on Fri,  7 Jul 2023 12:06:05 +0800:

> Convert platform_get_resource(), devm_ioremap_resource() to a single
> call to devm_platform_get_and_ioremap_resource(), as this is exactly
> what this function does.
> 
> Signed-off-by: Yangtao Li <frank.li@xxxxxxxx>
> ---
>  drivers/mtd/nand/raw/sunxi_nand.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
> index 9884304634f6..db36bd755b8d 100644
> --- a/drivers/mtd/nand/raw/sunxi_nand.c
> +++ b/drivers/mtd/nand/raw/sunxi_nand.c
> @@ -2087,8 +2087,7 @@ static int sunxi_nfc_probe(struct platform_device *pdev)
>  	nand_controller_init(&nfc->controller);
>  	INIT_LIST_HEAD(&nfc->chips);
>  
> -	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	nfc->regs = devm_ioremap_resource(dev, r);
> +	nfc->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &r);

Why do you keep a reference over the resource? Why not just
devm_platform_ioremap_resource(pdev, 0) ?

This comment is valid for almost all the cases in this series.

When the resource is only needed in an error printk, I am also in favor
of modifying the error message to avoid having to grab the resource.

>  	if (IS_ERR(nfc->regs))
>  		return PTR_ERR(nfc->regs);
>  

These comments apply to the 18 patches.

Thanks,
Miquèl