linux-kernel - Re: [PATCH v2 6/7] dma-buf: Change locking policy for mmap()

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Message-ID: <14d7ed85-7ab6-04d9-1958-d5ceae2a79f8@collabora.com>
Date:   Mon, 1 May 2023 18:42:40 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Christian König <christian.koenig@....com>
Cc:     linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        linux-tegra@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        kernel@...labora.com, Sumit Semwal <sumit.semwal@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Liam Mark <lmark@...eaurora.org>,
        Brian Starkey <Brian.Starkey@....com>,
        John Stultz <jstultz@...gle.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Tomi Valkeinen <tomba@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Amol Maheshwari <amahesh@....qualcomm.com>,
        Emil Velikov <emil.l.velikov@...il.com>
Subject: Re: [PATCH v2 6/7] dma-buf: Change locking policy for mmap()

On 4/6/23 19:06, Dmitry Osipenko wrote:
> Change locking policy of mmap() callback, making exporters responsible
> for handling dma-buf reservation locking. Previous locking policy stated
> that dma-buf is locked for both importers and exporters by the dma-buf
> core, which caused a deadlock problem for DRM drivers in a case of
> self-imported dma-bufs which required to take the lock from the DRM
> exporter side.
> 
> Reviewed-by: Emil Velikov <emil.l.velikov@...il.com>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> ---
>  drivers/dma-buf/dma-buf.c | 17 +++--------------
>  1 file changed, 3 insertions(+), 14 deletions(-)

Christian, may I add yours ack to this patch?

-- 
Best regards,
Dmitry