linux-kernel - Re: [PATCH v7 18/21] dma-buf: Move dma_buf_mmap() to dynamic locking specification

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Message-ID: <daebe990-6032-15a1-175a-84e9e1ce2ca0@collabora.com>
Date:   Mon, 7 Nov 2022 20:37:49 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     David Airlie <airlied@...ux.ie>, Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>,
        Daniel Almeida <daniel.almeida@...labora.com>,
        Gert Wollny <gert.wollny@...labora.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Daniel Stone <daniel@...ishbar.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Clark <robdclark@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Thomas Hellström <thomas_os@...pmail.org>,
        Qiang Yu <yuq825@...il.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Amol Maheshwari <amahesh@....qualcomm.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Tomi Valkeinen <tomba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Lucas Stach <l.stach@...gutronix.de>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        Ruhl Michael J <michael.j.ruhl@...el.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Dmitry Osipenko <digetx@...il.com>,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        amd-gfx@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        kernel@...labora.com, virtualization@...ts.linux-foundation.org,
        linux-rdma@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v7 18/21] dma-buf: Move dma_buf_mmap() to dynamic locking
 specification

On 11/7/22 20:25, Daniel Vetter wrote:
>> Move dma_buf_mmap() function to the dynamic locking specification by
>> taking the reservation lock. Neither of the today's drivers take the
>> reservation lock within the mmap() callback, hence it's safe to enforce
>> the locking.
>>
>> Acked-by: Sumit Semwal <sumit.semwal@...aro.org>
>> Acked-by: Christian König <christian.koenig@....com>
>> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> Just noticed this while reading code ... this patch seems to have
> missed dma_buf_mmap_internal()?
> 
> Might be good if at least some drivers gain a dma_resv_assert_held in
> that path to make sure we're not quite this bad, together with fixing
> this issue.

Good catch! I'll prepare the patches.

-- 
Best regards,
Dmitry