linux-kernel - Re: (subset) [PATCH v2 0/7] Move dma-buf mmap() reservation locking down to exporters

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Date:   Fri, 12 May 2023 15:54:40 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        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>,
        Amol Maheshwari <amahesh@....qualcomm.com>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.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
Subject: Re: (subset) [PATCH v2 0/7] Move dma-buf mmap() reservation
 locking down to exporters


On Thu, 06 Apr 2023 19:06:30 +0300, Dmitry Osipenko wrote:
> This patchset makes dma-buf exporters responisble for taking care of
> the reservation lock. I also included patch that moves drm-shmem to use
> reservation lock, to let CI test the whole set. I'm going to take all
> the patches via the drm-misc tree, please give an ack.
> 
> Previous policy stated that dma-buf core takes the lock around mmap()
> callback. Which meant that both importers and exporters shouldn't touch
> the reservation lock in the mmap() code path. This worked well until
> Intel-CI found a deadlock problem in a case of self-imported dma-buf [1].
> 
> [...]

Applied, thanks!

[4/7] fastrpc: Don't assert held reservation lock for dma-buf mmapping
      commit: 3f6b4c6f0bd0126f673f3578429239ae3860718b

Best regards,
-- 
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>