[PATCH AUTOSEL 6.1 5/5] nouveau: fix disp disabling with GSP

[David Airlie]

NAK for backporting this to anything, it is just a fix for 6.7


On Mon, Jan 8, 2024 at 10:28 PM Sasha Levin <sashal at kernel.org> wrote:
>
> From: Dave Airlie <airlied at gmail.com>
>
> [ Upstream commit 7854ea0e408d7f2e8faaada1773f3ddf9cb538f5 ]
>
> This func ptr here is normally static allocation, but gsp r535
> uses a dynamic pointer, so we need to handle that better.
>
> This fixes a crash with GSP when you use config=disp=0 to avoid
> disp problems.
>
> Signed-off-by: Dave Airlie <airlied at redhat.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20231222043308.3090089-4-airlied@gmail.com
> Signed-off-by: Sasha Levin <sashal at kernel.org>
> ---
>  drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c
> index 65c99d948b686..ae47eabd5d0bd 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/base.c
> @@ -359,7 +359,7 @@ nvkm_disp_oneinit(struct nvkm_engine *engine)
>         if (ret)
>                 return ret;
>
> -       if (disp->func->oneinit) {
> +       if (disp->func && disp->func->oneinit) {
>                 ret = disp->func->oneinit(disp);
>                 if (ret)
>                         return ret;
> @@ -461,8 +461,10 @@ nvkm_disp_new_(const struct nvkm_disp_func *func, struct nvkm_device *device,
>         spin_lock_init(&disp->client.lock);
>
>         ret = nvkm_engine_ctor(&nvkm_disp, device, type, inst, true, &disp->engine);
> -       if (ret)
> +       if (ret) {
> +               disp->func = NULL;
>                 return ret;
> +       }
>
>         if (func->super) {
>                 disp->super.wq = create_singlethread_workqueue("nvkm-disp");
> --
> 2.43.0
>