linux-kernel - Re: [Nouveau] [PATCH] drm/nouveau/acr: Abort loading ACR if no firmware was found

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Message-ID: <CACAvsv6-AJ4EHg7pNUWgsnCN0CYrO8gWd3NR8pu32a-wXSOjeA@mail.gmail.com>
Date:   Thu, 13 Jul 2023 06:38:56 +1000
From:   Ben Skeggs <skeggsb@...il.com>
To:     Dave Airlie <airlied@...il.com>
Cc:     Karol Herbst <kherbst@...hat.com>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <nouveau@...ts.freedesktop.org>, linux-kernel@...r.kernel.org,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <dri-devel@...ts.freedesktop.org>, Ben Skeggs <bskeggs@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Gourav Samaiya <gsamaiya@...dia.com>
Subject: Re: [Nouveau] [PATCH] drm/nouveau/acr: Abort loading ACR if no
 firmware was found

On Thu, 13 Jul 2023 at 05:31, Dave Airlie <airlied@...il.com> wrote:
>
> On Tue, 23 May 2023 at 19:37, Karol Herbst <kherbst@...hat.com> wrote:
> >
> > On Mon, May 22, 2023 at 10:18 PM Karol Herbst <kherbst@...hat.com> wrote:
> > >
> > > This fixes a NULL pointer access inside nvkm_acr_oneinit in case necessary
> > > firmware files couldn't be loaded.
> > >
> > > Closes: https://gitlab.freedesktop.org/drm/nouveau/-/issues/212
> > > Fixes: 4b569ded09fd ("drm/nouveau/acr/ga102: initial support")
> > > Signed-off-by: Karol Herbst <kherbst@...hat.com>
> > > ---
> > >  drivers/gpu/drm/nouveau/nvkm/subdev/acr/base.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/base.c
> > > index 795f3a649b12..6388234c352c 100644
> > > --- a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/base.c
> > > +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/base.c
> > > @@ -224,7 +224,7 @@ nvkm_acr_oneinit(struct nvkm_subdev *subdev)
> > >         u64 falcons;
> > >         int ret, i;
> > >
> > > -       if (list_empty(&acr->hsfw)) {
> > > +       if (list_empty(&acr->hsfw) || !acr->func->wpr_layout) {
> >
> > Now thinking about this, it should probably also check acr->func...
>
> with that fixed if you think you need it,
I don't *think* you do.  I believe modprobe will fail for any case it
can be NULL.

>
> Reviewed-by: Dave Airlie <airlied@...hat.com>
>
> >
> > >                 nvkm_debug(subdev, "No HSFW(s)\n");
> > >                 nvkm_acr_cleanup(acr);
> > >                 return 0;
> > > --
> > > 2.40.1
> > >
> >