linux-kernel - Re: [PATCH] iommu/arm-smmu: Axe a useless test in 'arm_smmu_master_alloc

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Date:   Mon, 16 Sep 2019 21:43:43 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Robin Murphy <robin.murphy@....com>, will@...nel.org,
        joro@...tes.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] iommu/arm-smmu: Axe a useless test in
 'arm_smmu_master_alloc_smes()'

Le 16/09/2019 à 12:46, Robin Murphy a écrit :
> On 15/09/2019 20:34, Christophe JAILLET wrote:
>> 'ommu_group_get_for_dev()' never returns NULL, so this test can be 
>> removed.
>
> Nit: typo in the function name.
>
> Otherwise, there definitely used to be some path where a NULL return 
> could leak out, so I would have had that in mind at the time I wrote 
> this, but apparently I never noticed that that had already been 
> cleaned up by the time this got merged.
>
Hi,

Maybe fixed by 72dcac633475 ("iommu: Warn once when device_group 
callback returns NULL")


CJ

> Reviewed-by: Robin Murphy <robin.murphy@....com>
>
> Thanks,
> Robin.
>
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> ---
>>   drivers/iommu/arm-smmu.c | 2 --
>>   1 file changed, 2 deletions(-)
>>
>> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
>> index c3ef0cc8f764..6fae8cdbe985 100644
>> --- a/drivers/iommu/arm-smmu.c
>> +++ b/drivers/iommu/arm-smmu.c
>> @@ -1038,8 +1038,6 @@ static int arm_smmu_master_alloc_smes(struct 
>> device *dev)
>>       }
>>         group = iommu_group_get_for_dev(dev);
>> -    if (!group)
>> -        group = ERR_PTR(-ENOMEM);
>>       if (IS_ERR(group)) {
>>           ret = PTR_ERR(group);
>>           goto out_err;
>>
>