netdev - Re: [PATCH v2 05/15] cxl: fix use of resource

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Message-ID: <ZqFxOge1S654X4Uf@debian>
Date: Wed, 24 Jul 2024 14:25:14 -0700
From: fan <nifan.cxl@...il.com>
To: alejandro.lucero-palau@....com
Cc: linux-cxl@...r.kernel.org, netdev@...r.kernel.org,
	dan.j.williams@...el.com, martin.habets@...inx.com,
	edward.cree@....com, davem@...emloft.net, kuba@...nel.org,
	pabeni@...hat.com, edumazet@...gle.com, richard.hughes@....com,
	Alejandro Lucero <alucerop@....com>
Subject: Re: [PATCH v2 05/15] cxl: fix use of resource_contains

On Mon, Jul 15, 2024 at 06:28:25PM +0100, alejandro.lucero-palau@....com wrote:
> From: Alejandro Lucero <alucerop@....com>
> 
> For a resource defined with size zero, resource contains will also
> return true.

s/resource contains/resource_contains/

Fan
> 
> Add resource size check before using it.
> 
> Signed-off-by: Alejandro Lucero <alucerop@....com>
> ---
>  drivers/cxl/core/hdm.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
> index 3df10517a327..4af9225d4b59 100644
> --- a/drivers/cxl/core/hdm.c
> +++ b/drivers/cxl/core/hdm.c
> @@ -327,10 +327,13 @@ static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
>  	cxled->dpa_res = res;
>  	cxled->skip = skipped;
>  
> -	if (resource_contains(&cxlds->pmem_res, res))
> +	if ((resource_size(&cxlds->pmem_res)) && (resource_contains(&cxlds->pmem_res, res))) {
> +		printk("%s: resource_contains CXL_DECODER_PMEM\n", __func__);
>  		cxled->mode = CXL_DECODER_PMEM;
> -	else if (resource_contains(&cxlds->ram_res, res))
> +	} else if ((resource_size(&cxlds->ram_res)) && (resource_contains(&cxlds->ram_res, res))) {
> +		printk("%s: resource_contains CXL_DECODER_RAM\n", __func__);
>  		cxled->mode = CXL_DECODER_RAM;
> +	}
>  	else {
>  		dev_warn(dev, "decoder%d.%d: %pr mixed mode not supported\n",
>  			 port->id, cxled->cxld.id, cxled->dpa_res);
> -- 
> 2.17.1
>