linux-kernel - Re: [PATCH] media: v4l2-mem2mem: always call poll

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Message-ID: <CAAVeFuKh+f0XPfBE+Zs_cjfvARaXjua4MtmStFF1xr2AiXcNog@mail.gmail.com>
Date:   Tue, 24 Nov 2020 00:18:37 +0900
From:   Alexandre Courbot <gnurou@...il.com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: v4l2-mem2mem: always call poll_wait() on queues

On Tue, Nov 3, 2020 at 6:48 PM Hans Verkuil <hverkuil-cisco@...all.nl> wrote:
> There is one other place where this needs to be tested: testEvents() in
> v4l2-test-controls.cpp: currently this only tests select(), but there
> should be a second epoll test here as well that just tests EPOLLPRI.
>
> This would catch drivers that do not stream (i.e. no EPOLLIN/OUT) but
> that do have controls (so support EPOLLPRI).

IIUC this part should not require fixing - EPOLLPRI is behaving
properly, the bug is only with EPOLLIN/EPOLLOUT.