linux-kernel - Re: [PATCH v2 09/13] iommu/rockchip: Use iommu_group_get_for_dev() for add

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Message-ID: <5A5F474C.8020606@rock-chips.com>
Date:   Wed, 17 Jan 2018 20:53:32 +0800
From:   JeffyChen <jeffy.chen@...k-chips.com>
To:     Robin Murphy <robin.murphy@....com>, linux-kernel@...r.kernel.org
CC:     jcliang@...omium.org, xxm@...k-chips.com, tfiga@...omium.org,
        Heiko Stuebner <heiko@...ech.de>,
        linux-rockchip@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 09/13] iommu/rockchip: Use iommu_group_get_for_dev()
 for add_device

On 01/17/2018 08:47 PM, JeffyChen wrote:
>>>
>>> +static struct iommu_group *rk_iommu_device_group(struct device *dev)
>>> +{
>>> +    struct iommu_group *group;
>>> +    int ret;
>>> +
>>> +    group = iommu_group_get(dev);
>>> +    if (!group) {
>>
>> This check is pointless - if dev->iommu_group were non-NULL you wouldn't
>> have been called in the first place.
> right, it's allocated in the probe.
oops, sorry, i see, this is not needed because device_group() is only be 
called when iommu_group_get() returns NULL