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

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Message-ID: <CAAFQd5DXvnjaFw4Ct1Xn90nQZ4F4dLtov0ymG-tycQt5oLNpiQ@mail.gmail.com>
Date:   Tue, 13 Mar 2018 19:15:08 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
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>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v9 1/5] driver core: Find an existing link between two devices

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?

Best regards,
Tomasz