linux-kernel - Re: [PATCH] drm/amd/display: remove no need NULL check before kfree

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Date:   Wed, 17 Nov 2021 16:37:17 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Bernard Zhao <bernard@...o.com>
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Solomon Chiu <solomon.chiu@....com>,
        "Li, Roman" <Roman.Li@....com>,
        Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>,
        Eric Bernstein <Eric.Bernstein@....com>,
        Atufa Khan <Atufa.Khan@....com>,
        Jimmy Kizito <Jimmy.Kizito@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amd/display: remove no need NULL check before kfree

Applied.  Thanks!

On Mon, Nov 15, 2021 at 8:48 PM Bernard Zhao <bernard@...o.com> wrote:
>
> This change is to cleanup the code a bit.
>
> Signed-off-by: Bernard Zhao <bernard@...o.com>
> ---
>  .../drm/amd/display/dc/dcn10/dcn10_resource.c  | 18 ++++++------------
>  1 file changed, 6 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
> index f37551e00023..0090550d4aee 100644
> --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
> +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
> @@ -978,10 +978,8 @@ static void dcn10_resource_destruct(struct dcn10_resource_pool *pool)
>                 pool->base.mpc = NULL;
>         }
>
> -       if (pool->base.hubbub != NULL) {
> -               kfree(pool->base.hubbub);
> -               pool->base.hubbub = NULL;
> -       }
> +       kfree(pool->base.hubbub);
> +       pool->base.hubbub = NULL;
>
>         for (i = 0; i < pool->base.pipe_count; i++) {
>                 if (pool->base.opps[i] != NULL)
> @@ -1011,14 +1009,10 @@ static void dcn10_resource_destruct(struct dcn10_resource_pool *pool)
>         for (i = 0; i < pool->base.res_cap->num_ddc; i++) {
>                 if (pool->base.engines[i] != NULL)
>                         dce110_engine_destroy(&pool->base.engines[i]);
> -               if (pool->base.hw_i2cs[i] != NULL) {
> -                       kfree(pool->base.hw_i2cs[i]);
> -                       pool->base.hw_i2cs[i] = NULL;
> -               }
> -               if (pool->base.sw_i2cs[i] != NULL) {
> -                       kfree(pool->base.sw_i2cs[i]);
> -                       pool->base.sw_i2cs[i] = NULL;
> -               }
> +               kfree(pool->base.hw_i2cs[i]);
> +               pool->base.hw_i2cs[i] = NULL;
> +               kfree(pool->base.sw_i2cs[i]);
> +               pool->base.sw_i2cs[i] = NULL;
>         }
>
>         for (i = 0; i < pool->base.audio_count; i++) {
> --
> 2.33.1
>