linux-kernel - Re: [PATCH] dma-buf/poll: Get a file reference for outstanding fence callbacks

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Message-ID: <babe4878-d99b-2ae4-2389-8139477783db@daenzer.net>
Date:   Fri, 23 Jul 2021 11:11:28 +0200
From:   Michel Dänzer <michel@...nzer.net>
To:     Christian König <christian.koenig@....com>
Cc:     linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org
Subject: Re: [PATCH] dma-buf/poll: Get a file reference for outstanding fence
 callbacks

On 2021-07-23 11:02 a.m., Daniel Vetter wrote:
> On Fri, Jul 23, 2021 at 10:19:49AM +0200, Michel Dänzer wrote:
>> On 2021-07-23 10:04 a.m., Christian König wrote:
>>> Am 23.07.21 um 09:58 schrieb Michel Dänzer:
>>>> From: Michel Dänzer <mdaenzer@...hat.com>
>>>>
>>>> This makes sure we don't hit the
>>>>
>>>>     BUG_ON(dmabuf->cb_in.active || dmabuf->cb_out.active);
>>>>
>>>> in dma_buf_release, which could be triggered by user space closing the
>>>> dma-buf file description while there are outstanding fence callbacks
>>>> from dma_buf_poll.
>>>
>>> I was also wondering the same thing while working on this, but then thought that the poll interface would take care of this.
>>
>> I was able to hit the BUG_ON with https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1880 .
> 
> igt test would be really lovely. Maybe base something off the
> import/export igts from Jason?

I'll see what I can do, busy with other stuff right now though.


-- 
Earthling Michel Dänzer               |               https://redhat.com
Libre software enthusiast             |             Mesa and X developer