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

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Message-ID: <3a4b353b-0ead-0e76-3340-93595044fdb5@amd.com>
Date: Fri, 16 Aug 2024 15:42:33 +0100
From: Alejandro Lucero Palau <alucerop@....com>
To: Zhi Wang <zhiw@...dia.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, richard.hughes@....com, targupta@...dia.com
Subject: Re: [PATCH v2 05/15] cxl: fix use of resource_contains


On 8/9/24 10:14, Zhi Wang wrote:
> On Mon, 15 Jul 2024 18:28:25 +0100
> <alejandro.lucero-palau@....com> wrote:
>
>> From: Alejandro Lucero <alucerop@....com>
>>
>> For a resource defined with size zero, resource contains will also
>> return true.
>>
>> 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);
> Also, please clean up your printks before sending them to stable.


Sure.

Thanks!