linux-kernel - Re: [PATCH v6 3/5] drm/nouveau: Fix deadlock with fb

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Message-ID: <CAKb7UvjqVC5w4PDaVLtZqKs94bo22d4BGYgsQj9K-2_rksoqvg@mail.gmail.com>
Date:   Mon, 13 Aug 2018 15:11:28 -0400
From:   Ilia Mirkin <imirkin@...m.mit.edu>
To:     Lyude Paul <lyude@...hat.com>
Cc:     nouveau <nouveau@...ts.freedesktop.org>,
        "# 3.9+" <stable@...r.kernel.org>, Lukas Wunner <lukas@...ner.de>,
        Karol Herbst <karolherbst@...il.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Thierry Reding <treding@...dia.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 3/5] drm/nouveau: Fix deadlock with fb_helper with
 async RPM requests

On Mon, Aug 13, 2018 at 3:07 PM, Lyude Paul <lyude@...hat.com> wrote:
> +bool
> +nouveau_fbcon_hotplugged_in_suspend(struct nouveau_fbdev *fbcon)
> +{
> +       bool hotplug;
> +
> +       if (!fbcon)
> +               return false;
> +
> +       mutex_lock(&fbcon->hotplug_lock);
> +       hotplug = fbcon->hotplug_waiting;
> +       mutex_unlock(&fbcon->hotplug_lock);
> +
> +       return hotplug;
> +}

I'm probably missing it, but where is this function used?