linux-kernel - Re: [PATCH] fbdev: wait for references go away

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Message-ID: <20200120181146.GL1314@mail-itl>
Date:   Mon, 20 Jan 2020 19:11:46 +0100
From:   Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:     Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org,
        "open list:FRAMEBUFFER LAYER" <linux-fbdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fbdev: wait for references go away

On Mon, Jan 20, 2020 at 06:51:17PM +0100, Bartlomiej Zolnierkiewicz wrote:
> I guess that a problem is happening during DRM driver load while fbdev
> driver is loaded? I assume do_unregister_framebuffer() is called inside
> do_remove_conflicting_framebuffers()?

Yes, exactly. More details here:
https://lists.linuxfoundation.org/pipermail/virtualization/2020-January/045026.html

> At first glance it seems to be an user-space issue as it should not be
> holding references on /dev/fb0 while DRM driver is being loaded.

How plymouth would know when exactly it needs to release /dev/fb0?

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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