linux-kernel - Re: [Nouveau] [PATCH] drm/nouveau/acr: fix a couple NULL vs IS

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Date:   Fri, 19 Nov 2021 08:45:38 +1000
From:   Ben Skeggs <skeggsb@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>,
        ML nouveau <nouveau@...ts.freedesktop.org>,
        kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [Nouveau] [PATCH] drm/nouveau/acr: fix a couple NULL vs IS_ERR() checks

On Thu, 18 Nov 2021 at 21:13, Dan Carpenter <dan.carpenter@...cle.com> wrote:
>
> The nvkm_acr_lsfw_add() function never returns NULL.  It returns error
> pointers on error.
>
> Fixes: 22dcda45a3d1 ("drm/nouveau/acr: implement new subdev to replace "secure boot"")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Ben Skeggs <bskeggs@...hat.com>

> ---
>  drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c | 6 ++++--
>  drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c | 6 ++++--
>  2 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
> index cdb1ead26d84..82b4c8e1457c 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gm200.c
> @@ -207,11 +207,13 @@ int
>  gm200_acr_wpr_parse(struct nvkm_acr *acr)
>  {
>         const struct wpr_header *hdr = (void *)acr->wpr_fw->data;
> +       struct nvkm_acr_lsfw *lsfw;
>
>         while (hdr->falcon_id != WPR_HEADER_V0_FALCON_ID_INVALID) {
>                 wpr_header_dump(&acr->subdev, hdr);
> -               if (!nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id))
> -                       return -ENOMEM;
> +               lsfw = nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id);
> +               if (IS_ERR(lsfw))
> +                       return PTR_ERR(lsfw);
>         }
>
>         return 0;
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
> index fb9132a39bb1..fd97a935a380 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/acr/gp102.c
> @@ -161,11 +161,13 @@ int
>  gp102_acr_wpr_parse(struct nvkm_acr *acr)
>  {
>         const struct wpr_header_v1 *hdr = (void *)acr->wpr_fw->data;
> +       struct nvkm_acr_lsfw *lsfw;
>
>         while (hdr->falcon_id != WPR_HEADER_V1_FALCON_ID_INVALID) {
>                 wpr_header_v1_dump(&acr->subdev, hdr);
> -               if (!nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id))
> -                       return -ENOMEM;
> +               lsfw = nvkm_acr_lsfw_add(NULL, acr, NULL, (hdr++)->falcon_id);
> +               if (IS_ERR(lsfw))
> +                       return PTR_ERR(lsfw);
>         }
>
>         return 0;
> --
> 2.20.1
>