linux-kernel - Re: [PATCH v9 1/5] driver core: Find an existing link between two devices

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Message-ID: <CAAFQd5A5Rj1KAZjUc5ZUKuKnbkA5Q6aLw9z0H3_kfyBQOOF-gw@mail.gmail.com>
Date:   Tue, 13 Mar 2018 20:23:34 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Lukas Wunner <lukas@...ner.de>
Cc:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        "open list:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Will Deacon <will.deacon@....com>,
        Rob Clark <robdclark@...il.com>,
        Sricharan R <sricharan@...eaurora.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Archit Taneja <architt@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v9 1/5] driver core: Find an existing link between two devices

On Tue, Mar 13, 2018 at 7:34 PM, Vivek Gautam
<vivek.gautam@...eaurora.org> wrote:
> Hi Tomasz,
>
> On Tue, Mar 13, 2018 at 3:45 PM, Tomasz Figa <tfiga@...omium.org> wrote:
>> Hi Vivek,
>>
>> Thanks for the patch.
>>
>> On Tue, Mar 13, 2018 at 5:55 PM, Vivek Gautam
>> <vivek.gautam@...eaurora.org> wrote:
>>> The lists managing the device-links can be traversed to
>>> find the link between two devices. The device_link_add() APIs
>>> does traverse these lists to check if there's already a link
>>> setup between the two devices.
>>> So, add a new APIs, device_link_find(), to find an existing
>>> device link between two devices - suppliers and consumers.
>>
>> I'm wondering if this API would be useful for anything else that the
>> problem we're trying to solve with deleting links without storing them
>> anywhere. Perhaps a device_link_del_dev(consumer, supplier) would be a
>> better alternative?
>
> Yea, that sounds simpler i think. Will add this API instead of
> find_link(). Thanks.

Perhaps let's wait for a moment to see if there are other opinions. :)

Rafael, Lucas, any thoughts?

Best regards,
Tomasz