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

Dmitry Osipenko
2023-06-20T15:58:23Z

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@gmail.com>
>> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.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.

--
Best regards,
Dmitry