linux-kernel - Re: [PATCH v7 2/7] perf/amd/iommu: Modify functions to query max banks and counters

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Message-ID: <862635a0-a4fc-066e-0a45-e8626a02775c@amd.com>
Date:   Wed, 11 Jan 2017 10:03:50 +0700
From:   Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:     Joerg Roedel <joro@...tes.org>
CC:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <bp@...en8.de>, <peterz@...radead.org>, <mingo@...hat.com>
Subject: Re: [PATCH v7 2/7] perf/amd/iommu: Modify functions to query max
 banks and counters



On 1/10/17 21:43, Joerg Roedel wrote:
> On Mon, Jan 09, 2017 at 09:33:42PM -0600, Suthikulpanit, Suravee wrote:
>> +static struct amd_iommu *get_amd_iommu(uint idx)
>> +{
>> +	uint i = 0;
>> +	struct amd_iommu *iommu = NULL;
>> +
>> +	for_each_iommu(iommu) {
>> +		if (i == idx)
>> +			break;
>> +		i++;
>> +	}
>> +	return iommu;
>> +}
>
> Sorry for missing that in the last review, but this function returns
> just the last iommu in the list when there are less iommus than the
> requested index.
>
> Is that intentional? The following code checks for !iommu, so I guess
> not. It should look more like this then:
>
> 	static struct amd_iommu *get_amd_iommu(uint idx)
> 	{
> 		uint i = 0;
> 		struct amd_iommu *iommu, *ret = NULL;
>
> 		for_each_iommu(iommu)
> 			if (i++ == idx) {
> 				ret = iommu;
> 				break;
> 			}
> 		return ret;
> 	}
>
>
> Regards,
>
> 	Joerg

Right.... Thanks for catching this. Do you want me to send out V8 with 
this fix?

Suravee