linux-kernel - Re: [PATCH v4 5/6] dma-buf: Change locking policy for mmap()

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Date:   Wed, 21 Jun 2023 07:42:44 +0200
From:   Christian König <christian.koenig@....com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Sumit Semwal <sumit.semwal@...aro.org>
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, kernel@...labora.com,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        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>,
        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>,
        Emil Velikov <emil.l.velikov@...il.com>
Subject: Re: [PATCH v4 5/6] dma-buf: Change locking policy for mmap()

Am 20.06.23 um 17:58 schrieb Dmitry Osipenko:
> On 5/31/23 22:58, Dmitry Osipenko wrote:
>> On 5/30/23 01:39, 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, you acked the drm patch of this series sometime ago, perhaps
>> it also implies implicit ack to this patch, but I'd prefer to have the
>> explicit ack. I'll apply this series to drm-misc later this week if
>> you'll approve this dma-buf change. Thanks in advance!
> I'll merge the patches tomorrow. If there are any additional comments,
> then please don't hesitate to post them.

Sorry for not responding earlier, I have been moving both my office as 
well as my household and still catching up.

I don't have time for an in-deep review, but my ack stands for the whole 
series.

Regards,
Christian.