netdev - Re: [PATCH v3 07/20] cxl: harden resource_contains checks to handle zero size resources

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Message-ID: <425a7ffe-39c6-4e20-dd30-2d65eb1bbd61@amd.com>
Date: Mon, 16 Sep 2024 13:36:39 +0100
From: Alejandro Lucero Palau <alucerop@....com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 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
Subject: Re: [PATCH v3 07/20] cxl: harden resource_contains checks to handle
 zero size resources


On 9/13/24 18:36, Jonathan Cameron wrote:
> On Sat, 7 Sep 2024 09:18:23 +0100
> <alejandro.lucero-palau@....com> wrote:
>
>> From: Alejandro Lucero <alucerop@....com>
>>
>> For a resource defined with size zero, resource_contains returns
>> always true.
>>
>> Add resource size check before using it.
>>
>> Signed-off-by: Alejandro Lucero <alucerop@....com>
>> ---
>>   drivers/cxl/core/hdm.c | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
>> index 3df10517a327..953a5f86a43f 100644
>> --- a/drivers/cxl/core/hdm.c
>> +++ b/drivers/cxl/core/hdm.c
>> @@ -327,10 +327,11 @@ 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))) {
> Excess brackets + I'd break that over two lines.


Right. I'll fix it.

Thanks


>
>>   		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))) {
> Same here,
>
>>   		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);