linux-kernel - Re: [PATCH v2 02/13] iommu/rockchip: Suppress unbinding

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Message-ID: <CAAFQd5CXH_20649oZNrzFjHoKfpDi6gHF91jd3uCyjyOkH+Ohw@mail.gmail.com>
Date:   Wed, 17 Jan 2018 14:32:11 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Jeffy Chen <jeffy.chen@...k-chips.com>
Cc:     linux-kernel@...r.kernel.org, Ricky Liang <jcliang@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        simon xue <xxm@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        "open list:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 02/13] iommu/rockchip: Suppress unbinding

On Wed, Jan 17, 2018 at 1:23 PM, Tomasz Figa <tfiga@...omium.org> wrote:
> On Tue, Jan 16, 2018 at 10:25 PM, Jeffy Chen <jeffy.chen@...k-chips.com> wrote:
>> It's not safe to unbind rockchip IOMMU driver.
>
> Might be good to explain why it is not safe and actually add that it
> does not make any sense for such low level devices.

Actually, shouldn't we also remove support for .remove() and module
exit? I don't think it's actually feasible to unload this driver. We
actually even have ROCKCHIP_IOMMU Kconfig entry defined as bool, so
the driver can be only built-in.

Best regards,
Tomasz