linux-kernel - Re: [PATCH] drm/amd/display: return 'NULL' instead of 'false' from dcn20_acquire_idle_pipe_for_layer

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Message-ID: <CADnq5_O-LJHnHg_yw0jVxy9yT8ZqNq4s-U_surFXTcL=fPA21Q@mail.gmail.com>
Date:   Fri, 12 Jul 2019 13:56:39 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Charlene Liu <charlene.liu@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Nikola Cornij <nikola.cornij@....com>,
        clang-built-linux@...glegroups.com,
        Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>, Jun Lei <Jun.Lei@....com>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>
Subject: Re: [PATCH] drm/amd/display: return 'NULL' instead of 'false' from dcn20_acquire_idle_pipe_for_layer

On Fri, Jul 12, 2019 at 5:40 AM Arnd Bergmann <arnd@...db.de> wrote:
>
> clang complains that 'false' is a not a pointer:
>
> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn20/dcn20_resource.c:2428:10: error: expression which evaluates to zero treated as a null pointer constant of type 'struct pipe_ctx *' [-Werror,-Wnon-literal-null-conversion]
>                 return false;
>
> Changing it to 'NULL' looks like the right thing that will shut up
> the warning and make it easier to read, while not changing behavior.
>
> Fixes: 7ed4e6352c16 ("drm/amd/display: Add DCN2 HW Sequencer and Resource")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied.  Thanks!

Alex

> ---
>  drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
> index 70ac8a95d2db..66aa414ad38f 100644
> --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
> +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
> @@ -2425,7 +2425,7 @@ struct pipe_ctx *dcn20_acquire_idle_pipe_for_layer(
>                 ASSERT(0);
>
>         if (!idle_pipe)
> -               return false;
> +               return NULL;
>
>         idle_pipe->stream = head_pipe->stream;
>         idle_pipe->stream_res.tg = head_pipe->stream_res.tg;
> --
> 2.20.0
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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